The three state of matter are solid, liquid and gas. Water exists in all these states as ice, liquid water, water vapor respectively. The level of energy will varies from each state where, gaseous particles possess highest energy.
What is states of matter?Every substances are able to exhibit three states of matter namely gas, liquid and solid. However, some are more stable in any one state more probably by origin.
Substances in solid state have molecules closely packed without a space to move apart each other. Hence, the energy of molecules in solid state is very low.
In liquid state, molecules have some space to move apart and thus they can flow and have no definite shape like solids. Whereas in gases, molecules are far apart and they are free enough to move and thus have highest energy.
Therefore, water molecules in its vapor state is having highest energy than its liquid state and ice.
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draw the structure for cis-2,3-dibromo-2-hexene. draw the molecule on the canvas by choosing buttons from the tools (for bonds), atoms, and advanced template toolbars. the single bond is active by default.
The shape of cis-2,3-dibromo-2-hexene is shown beneath. consequently, the formulation of cis-2,three-dibromo-2-hexene is cis−CH3CBr=CBrCH2CH2CH3 c i s − C H 3 C B r = C B r C H 2 C H 2 C H three.
The isomer wherein the 2 chlorine (Cl) atoms lie at the same side of the molecule is known as the cis isomer (Latin cis, meaning “in this aspect”) and is named cis-1,2-dichloroethene.
1-Hexene is an natural compound with the formulation C₆H₁₂. it is an alkene this is labeled in industry as better olefin and an alpha-olefin, the latter term which means that the double bond is placed on the alpha role, endowing the compound with better reactivity and thus beneficial chemical houses.
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Write the charge and full ground-state electron configuration ofthe monatomic ion most likely to be formed by each of thefollowing. (Type your answer using the format 1s2 2s2 2p1 for1s2 2s22p1. Enter [H]+ for H+ and [O]2- forO2-.)
(a) Na
charge
electron configuration
(b) Br
charge
electron configuration
(c) Rb
charge
electron configuration
The electronic configuration of Rubidium in noble gas notation is represented as [Kr]5s1.
What is Electronic configuration?
The arrangement of electrons into the orbitals of an atom using some fundamental principle is called its electronic configuration.
Electronic configuration of Sodium (Na):
Sodium is an alkali metal having atomic number 11.
Therefore, the electronic configuration will be 1s22s22p63s1.
Electronic configuration of Sodium-ion (Na+):
The sodium atom loses one electron to attain a noble gas configuration and form a sodium ion.
Therefore, the electronic configuration for sodium-ion will be 1s22s22p6.
Bromine(Br):
The electron configuration of bromine as: 1s22s22p63s23p64s23d104p5.
Bromine is a p-block element having an atomic number 35.
Bromine belongs to group 17 which is known as halogens.
Electronic configuration of Group 17:
The elements of group 17 have seven electrons in their outermost shell.
So, the valence electronic configuration of group 17 is ns2np5.
Electronic configuration of Bromine:
The electronic configuration of fluorine is 1s22s22p63s23p64s23d104p5.
It can be written as: [Ar]4s23d104p5
Electronic configuration of Rubidium:
The atomic symbol of Rubidium is Rb.
The atomic number of Rubidium is 37 and it is a part of the alkali metal family.
As the atomic number is equal to the number of electrons present in a neutral element. So, the number of electrons are 37.
The electronic configuration of Rubidium is 1s22s22p63s23p64s23d104p65s1.
The electronic configuration of Rubidium in noble gas notation is represented as [Kr]5s1.
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An atmospheric inversion is a phenomenon that may have disastrous effects with respect to
air pollution. An atmospheric inversion occurs when a
A) lower layer of cool air is trapped by an upper layer of warmer air.
B) lower layer of warm air is trapped by an upper layer of cooler air.
C) lower layer of oxygen rich air is trapped by an upper layer of oxygen deficient air.
D) lower layer of oxygen deficient air is trapped by an upper layer of oxygen rich air.
An atmospheric inversion occurs when a lower layer of cool air is trapped by an upper layer of warmer air. So the correct option is 'A'
What is an inversion?An inversion is a change/deviation from the normal change of an atmospheric property with altitude. Atmospheric inversion are layers where the temperature rises with height. Multiple heights may experience the same temperature when inversions are present. The retrieval of cloud height becomes troublesome if the retrieved cloud temperature is within the range of temperatures in the inversion layer.
Inversion layer is a region or layer of the atmosphere in which temperature increases rather than decreases with elevation.
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rank the compounds in order of increasing rates of their reactions by the sn1 or e1 mechanism. you are currently in a ranking module. turn off browse mode or quick nav, tab to move, space or enter to pick up, tab to move items between bins, arrow keys to change the order of items, space or enter to drop. slowest fastest answer bank
The explanation of the reaction between the compound is here.
What is compound?
A thing that is composed of two or more separate elements is called compound.
Sol-There is no chemical reaction. Know the extent between to react to react and fair play mixing I too means iodine and potassium I Od um ordered solution solution and I could not React directly as such bad form poorly I owed eight iron like I five and I seven. They negatively charged iodide in the negatively charged how you died. All right, come and did come about charge donor. The neutral iodine charging accepted a solution of iodine, a solution of iodine and potassium iodide um added in water had the light orange brown color, light orange brown color, orange brown color. Once a mileage is added it from another city complex. When once a mileage in my load I added it from another city complex.
When once a mileage in my load I added it from another city complex. The police have cried. The police had cried, the police have cried act as a George donor charges and the police have died. And the poly iodide act as a except her. The new council looks absorbing light of a different wavelength than polly iodide and the color turn dark dark blue. The object structure are poorly added inside the am I late helix Alex is not clear. Are bulky and sit inside the policy crowds of glucose units and could not get out of date.
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will, jill, and phil are all wheat farmers. the wheat industry is perfectly (purely) competitive. the first chart shows how much each farmer produces at different price levels. the second chart shows each farmer's minimum average total cost (atc), average variable cost (avc), and marginal cost (mc). based on this data (assuming these three are the only producers), plot the industry supply curves: one for the short run and one for the long run.
The short run and long run curves are attached below
What is variable cost?Variable costs, the costs those are incurred when the quantity of goods or services produced by a business changes. Variable cost, is the sum of the marginal costs of all the units produced. It can also be known as a normal expense. Fixed and variable costs create the two components of total cost.
For the given data,
Price($) Short run quantity Long run quantity
2.00 6 0
4.00 12 6
6.00 18 14
8.00 26 26
In the short term, companies will not fall below their average minimum variable cost. The supply curve is, in the short run, the upward sloping portion of the marginal cost curve above the minimum AVC. Finally, the industry supply curve is the sum of all short-term supply curves.
Where,
At, P = $2.00
Market supply = 4 + 2 = 6
At, P = $4.00
Market supply = 6 + 4 + 2 = 12
At, P = $6.00
Market supply = 9 + 5 + 4 = 18
At, P = $8.00
Market supply = 12 + 8 + 6 = 26
Now, in the long run, firm prices must correspond not only to marginal cost, but also to average cost. Above min. of ATC.
Long term, P = $2, no bids because min ATC is above price
At, P = $4.00, only will supply
At, P = $6.00, Will and Jill both would supply
At, P = $8.00, All three would supply
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show between force pressure and area
Answer:
Relationship: The Pressure on an Area and the Force Acting Perpendicularly to the Area. The pressure, , on an area, , is given by = , where is the force acting perpendicularly to all the sides of the area
True/False: All entropies of fusion are negative.
True - fusion leads to less microstates (degrees of freedom).
False - fusion leads to more microstates (degrees of freedom).
False - fusion leads to less microstates (degrees of freedom).
True - fusion leads to more microstates (degrees of freedom).
The statement All entropies of fusion are negative is Fasle.
This is because - fusion leads to more microstates (degrees of freedom).
Hence, option B is correct.
What is entropy?Entropy is a measure of the degree of randomness of a body.
The higher the randomness of a substance, the higher the entropy of the substance, and vice versa.
Hence, any process that results in an increase in the randomness of the particles of a substance results in an increase in the entropy of that substance.
Thus, the process of change of state where the substance changes from a more ordered state to a less ordered state has a positive value for entropy change.
The processes of change of state that increases the value of the entropy of a substance are
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What are two ways in whitch electrons in atoms are in constant motion
Must be two
WIll GIVE BRAINLIST
Answer:
1. an electron moving around the nucleus
2. an electron moving on its axis
Explanation:
The best way to remember how atoms move is by comparing them to a solar system. Just like a solar system atoms have a core, in this case the nucleus, and each atom rotates around the nucleus just like planets revolve around a star. They also rotate just like a plant does.
The graph below shows the volume of hydrogen evolved against time for the reaction of a piece of solid magnesium metal with 1.00 mol dm-3 hydrochloric acid, HCl(aq). Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) (a) Deduce the rate of the reaction at time t = 1.5 minutes. (i) Assuming magnesium is the limiting reagent and the gas was collected at STP (i) Calculate the mass of the piece of magnesium metal used. (ii) Describe how the graph would have looked if the magnesium metal had been in powdered form.
(a) Rate of reaction = 13.33 dm³/min.
(b) Assuming magnesium is the limiting reagent:
Mass of magnesium = 486 gIf the magnesium metal had been in powdered form, the rate of reaction will be higher and the graph is attached belowWhat is rate of reaction?Reaction rate or rate of reaction is the rate at which a chemical reaction occurs and is defined as proportional to the increase in concentration of products per unit time and the decrease in concentration of reactants per unit time. Reaction rates can change dramatically.
Rate of reaction = Volume change/time
At 1.5 minutes volume of 20 dm³ H₂
So rate will be:
20/1.5 = 13.33 dm³/min.
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
For moles of H₂:
n = M × V
Where, n = number of moles
M = Molarity (1.00 mol/dm³)
V = Volume (20 dm³)
n = 1.00 × 20
n = 20 moles
Since the mole ratio of Mg and H₂ is 1:1, the moles of Mg are 20 moles.
m = n × Mm
Where, m = mass
n = number of moles (20 moles)
Mm = molar mass of Mg (24.30 g/mol)
m = 20 × 24.30
m = 486 g
Powders react faster than blocks - they have a larger surface area and reactions occur on the surface, so they are faster.
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The complete question is as follows:
The graph below shows the volume of hydrogen evolved against time for the reaction of a piece of solid magnesium metal with 1.00 mol dm-3 hydrochloric acid, HCl(aq). Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) (a) Deduce the rate of the reaction at time t = 1.5 minutes. (i) Assuming magnesium is the limiting reagent and the gas was collected at STP (i) Calculate the mass of the piece of magnesium metal used. (ii) Describe how the graph would have looked if the magnesium metal had been in powdered form.
a swimming pool in the shape of a rectangular prism has a volume of 4,800 cubic feet. the length of the pool is 2 feet less than twice the width, and the height is 6 feet less than the width. find the length and width of the pool.
The length and width of the swimming pool is 23.08.
What is length?
The term "length" refers to a measurement along an object's largest dimension. A portion of space, or volume, is occupied by a sample of material. Volume of an object can be determined by knowing the length of each side.
What is height?
The vertical distance between an object's top and bottom or its base and something above it is what is meant by the terms height, altitude, and elevation. Height is a vertical measurement, whether or not something is high.
2*6=4800
12=6400
=533^
=23.08
Therefore, the length and width of the swimming pool is 23.08.
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which statement is not part of the kinetic molecular theory of gases that tells us how gases generally behave? which statement is not part of the kinetic molecular theory of gases that tells us how gases generally behave? the actual volume occupied by gas molecules is extremely small compared with the volume that the gas occupies. the average kinetic energy of gas molecules is proportional to the kelvin temperature. the attractive forces between the particles of a gas are usually very strong. gas particles move randomly with high velocities.
The statement is not part of the kinetic molecular theory of gases that tells us how gases generally behave is "the attractive forces between the particles of a gas are usually very strong".
What is kinetic theory gases?The kinetic theory of gases describes a gas as a large number particles (atoms or molecules), all of which are in constant, random motion.
The rapidly moving particles constantly collide with each other and with the walls of the container.
The following are some of the assumptions of kinetic theory of gases;
the actual volume occupied by gas molecules is extremely small compared with the volume that the gas occupies.the average kinetic energy of gas molecules is proportional to the kelvin temperaturegas particles move randomly with high velocities.Thus, the only incorrect statement about kinetic theory of gases is "the attractive forces between the particles of a gas are usually very strong".
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the 3' end of a strand of dna contains a(n) ____ extending from the 3rd carbon of the sugar molecule.
The 3' end of a strand of DNA contains a hydroxide group extending from the 3rd carbon of the sugar molecule.
The 3' and 5' ends of DNA molecules are referred to as the phosphate-sugar backbone of the molecule. The 3' end of the DNA is composed of a phosphate group and a deoxyribose sugar. The 5' end of the molecule is composed of a phosphate group and a ribose sugar. Both the 3' and 5' ends are connected by a covalent bond between the phosphate group and the sugar.
The 3' end of the DNA molecule is known as the "tail" or "tail end" because it is the end of the molecule that is furthest away from the double helix structure.
The 3' end is also referred to as the "hydroxyl end" because it contains a hydroxyl group. This hydroxyl group is important for certain metabolic processes such as DNA replication and transcription.
The 5' end of the DNA molecule is known as the "head" or "head end" because it is the end of the molecule that is closest to the double helix structure.
The 5' end is also referred to as the "phosphate end" because it contains a phosphate group. This phosphate group is important for certain metabolic processes such as DNA replication and transcription.
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Consider the phosphorus tetrachloryl (PCI) cation. What is the central atom? Enter its chemical symbol. How many lone pairs are around the central atom? What is the ideal angle between the phosphorus- chlorine bonds? 0 Compared to the ideal angle, you would expect the actual angle between the phosphorus-chlorine bonds to be ... (choose one) (choose one) about the same X bigger Explanation Check smaller
Chemical structure determination involves the chemist identifying the molecular structure and, if possible and necessary, the electronic structure of the target molecule or other solids.
Looking at the molecular structure of PCl3, it is a pyramid with approximately three bond angles. 103°. PCl3 is polar because VSEPR theory predicts a triangular pyramidal molecular structure. Around phosphorus he has four electron density regions. One of them is the lone pair of electrons. In general, the lone pair of the central atom indicates that the molecule is polar.
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how to write a test variable and an outcome variable for science
Answer:
A test variable is a user-defined, name-value pair that stores and refers to information throughout a test and between tests.
Provide a default value to the variable during declaration.
Change the value of the variable using Set Variable statement. You can use the Add and Insert menus of the Test Editor to create Set Variable statements.
Set hard-coded value or value retried from a data source, such as dataset or reference that appears before the Set statement to the variable.
If a variable is initialized at various places such as test, compound test, schedule, or user group, the product uses the following order to initialize the value of the variable when running the test. The variable set in the variable table of the compound test editor takes the highest precedence followed by others:
Compound test setting in the variable table UI
Compound test specified in a var file
User group setting in the variable table UI
User group specified in a var file
Schedule specified setting in the variable table UI
Schedule specified in a var file
Command line
Outcome variables are usually the dependent variables which are observed and measured by changing independent variables. These variables determine the effect of the cause (independent) variables when changed for different values. The dependent variables are the outcomes of the experiments determining what was caused or what changed as a result of the study.
For a simple example, the marks a student obtains in an exam is a result of the hard word measured in the number of hours put behind studying and the intelligence measured in IQ are the independent variables. The marks obtained thus represents the dependent or outcome variable. When the values of the independent variables are changed, the marks may or may not change and hence dependent variables are dependent on the independent variables while the opposite is implausible i.e., when the marks are changed, it doesn’t change the number of hours of study or the IQ of the student.
The response variable is also called as the dependent variable because it depends on the causal factor, the independent variable. Depending on the various input values of the experimental variables, the responses are recorded.
Where are the electrons found in bohr's atomic model?
Answer:
The nucleus
Explanation: bohr tells us that the electrons which have a negative charge clicle the orbits in specific nucleus
61. Which sample has the largest mass? A) 1 mole of marshmallows B) 1 mole of Pb atoms C) 1 mole of CO2 molecules D) All of these have the same mass
No of moles of a substance = (Mass of substance / Molar mass of substance)
Here, all given substances have equal moles, i.e, 1 mole.
Hence,
mass of substance variation is directly related to their molar masses, the higher the molar mass, the greater is the mass of that substance.
Here, we know, order of the masses, in descending order are-
Marshmellows > Pb > CO2
Therefore, Masses are in same order-
Marshmellows > Pb > CO2
Thus, 1 mole of marshmellows has largest mass.
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Give formulas corresponding to the following names: (a) Potassium tris(oxalato)chromate(III) (b) Tris(ethylenediamine) cobalt(III) pentacyanoiodomanganate(II) (c) Diamminediaquabromochloroaluminum nitrate
The formula of Potassium tris(oxalate)chromate(III) is K₃ [Cr (ox)₃] and Tris(ethylenediamine) cobalt(III)- [Co (en)₃]³⁺ [Mn (CN)₅]³⁻ and the formula of Diamminediaquabromochloroaluminum nitrate is [Al (NH₃)₂(H₂O)₂ Br Cl] NO₃⁻.
What are coordination compounds?Coordination compounds are formed by the coordination bond of metals with ligands which can be neutral or anionic. The coordination compounds have a coordination sphere in which the metal with bonded ligands are written in a square bracket.
They may have another ligand or metal outside the sphere which are written outside a square bracket. Here the first complex is Potassium tris(oxalate)chromate(III), where the K metal is outside the sphere and the ligand is oxalate which is a bidentate ligand with 2- charge. The formula of the compound is K₃ [Cr (ox)₃].
The second complex is Tris(ethylenediamine) cobalt(III) pentacyanoiodomanganate(II) which is an ionic pair of complexes. One anionic part and the cationic part and the formula is [Co (en)₃]³⁺ [Mn (CN)₅]³⁻ .
The last one is Diamminediaquabromochloroaluminum nitrate, where nitrate ion is outside the coordination sphere and the formula is [Al (NH₃)₂(H₂O)₂ Br Cl] NO₃⁻.
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Solid al(no3)3 is added to distilled water to produce a solution in which the concentration.
The final concentration of Nitrate ions is 0.034 M.
What is distilled water?
Water is heated to the point of becoming a vapour, then it is condensed back into a liquid in a different container to produce distilled water. The original container still contains any contaminants from the starting water that do not boil at or below the starting water's boiling point. Consequently, distilled water qualifies as a category of purified water.
What is concentration?
A substance's concentration in a specific volume of tissue or liquid, such as blood, is known as its solubility in science. An example of this is salt. Reduced water content causes a substance to become more concentrated.
If the concentration of salt is x M then concentration of Nitrate ions in solution is (x/3) M and that of Al3+ is x M. Given concentration of Nitrate ions is 0.10 M, so Concentration of Al3+ = (0.10/3) M = 0.033 M
B. On addition of KOH, aluminum hydroxide, Al(OH)3 precipitates out. Moles of Al3+ present = (0.033*100)/1000 = 0.0033 mol
For one mole of Al3+ three moles of hydroxide ions are required. So, for 0.0033 mol of Al3+, 0.0099 mol hydroxide ions are required.
So, volume of 0.050 M KOH required = [(0.0099/0.050)*1000] mL = 198 mL
So, 198 mL of 0.050 M KOH is required.
Only Potassium ions and nitrate ions are left in solution.
Final volume after precipitation = 298 mL
Moles of nitrate present = (0.10*100)/1000 = 0.010 mol
Moles of K+ ions present = (0.050*198)/1000 = 0.0099 mol
So, final concentration of Nitrate ions = {(0.010/298)*1000} M = 0.034 M
Final concentration of K+ = {(0.0099/298)*1000} M = 0.030 M
Therefore, final concentration of Nitrate ions is 0.034 M.
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smallest to largest- atom, electron,neutron solution compound nucleus
Answer:
electron- neutron- nucleus- atom- solution compound
Explanation:
Calculate the number of C70 molecules that can be made from one mole of
carbon atoms.
The Avogadro constant = 6.02 × 10²³ per mole
[3]
The number of c70 molecules that can be made from one mole of carbon atoms would be 42.14 × 10²³ molecules.
Number of molecules in molesAccording to standards, 1 mole of any substance contains 6.02 × 10²³ molecules of the substance.
C70 is an allotope of carbon that contains 70 atoms in a single molecule of its atom.
If 1 mole of carbon contains 6.02 × 10²³ molecules by standard, then the number of C70 molecules that can be made from 1 mole of carbon atoms would be:
6.02 × 10²³ x 7 = 42.14 × 10²³ molecules
In other words, the number of C70 molecules that can be made from one mole of carbon atom would be 42.14 × 10²³ molecules.
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you have a sodium hydroxide solution that is approximately 0.2 m that you need to standardize. in order to make efficient use of your 50 ml buret, you need to know how many runs you can perform. estimate how many mls of 0.2 m naoh will be ne
4ml of NaOH is required for neutralization of KHP.
The chemical reaction is as follows:
NaOH + КНР → NaKP + H₂O
The mass of KHP used is 0.1509g, Molar mass of KHP is 204.29g/mol
Then moles of KHP used are given by
Moles of KHP used = 0.1509/204.29
Moles of KHP = 7.35 x 10⁻⁴ moles
The molarity of NaOH is 0.2 M Let the volume of NaOH required for neutralization be V.
Moles of NaOH needed = Molarity x volume of NaOH (L)
= 0.2 x V
As 1 mole of NaOH requires 1 mole of KHP, then
Moles of NaOH required = Molarity of NaOH x volume of NaOH (L)
On substituting the values we get,
0.2 V = 7.35×10⁻⁴
V = 7.35x10⁻⁴/0.2
= 3.675 X 10⁻³L
V = 3.675 mL
≈ 4mL
Therefore, 4 ml of NaOH is required for neutralization.
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A student placed a sample of a pure metal in a crucible and heated it strongly in air. Data from the experiment are given in the table below. The final mass was determined after the sample was cooled to room temperature. Mass of empty crucible 12.0 g Mass of crucible and sample before heating 14.4 g Mass of crucible and sample after heating 16.0 g Which of the following statements related to the experiment is correct? a) The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible b) The mass of the sample increased, so a chemical change occurred when bonds formed between the metal and another substance c) There was nothing for the metal to react with, so only a physical change could have occurred d) The sample was only heated, so neither a physical nor a chemical change occurred
The mass of the sample increased, so a chemical change occurred when bonds formed between the metal and another substance. Option B
What is a chemical change?We define a chemical change as on in which there is the formation of a new substance. Thus of we look at the system, we would notice that there is the formation of a new substance as the bonds to the reactants are broken and new bonds are made.
In the case of a physical change , there is nor formation of a new substance thus what we just have could be that the substances would move from a given physical state to the other and the mass of the system is just going to remain the same as it was at the beginning.
Since the mass was increased, then we could say that a chemical change has taken place as new bonds are formed.
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a geochemist in the field takes a small sample of the crystals of mineral compound from a rock pool lined with more crystals of . he notes the temperature of the pool, , and caps the sample carefully. back in the lab, the geochemist dissolves the crystals in of distilled water. he then filters this solution and evaporates all the water under vacuum. crystals of are left behind. the researcher washes, dries and weighs the crystals. they weigh .
Yes. Solubility is 0.070 kg/L
Solution:
Solubility = mass / Volume
Solubility = (0.210kg)/(3L) = 0.070 kg/L
Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.
Adding sugar cubes to your tea or coffee is a common example of a solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance to dissolve in a particular solvent. Water solubility is a measure of the amount of a chemical that can be dissolved in water at a given temperature.
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choose the best lewis structure for icl5
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. Therefore, the valence electron around Iodine is 7, out of 7 electron, 5 electron will make single bond with one electron of chlorine.
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot.
These are mainly beneficial in understanding the chemical formula of covalent compound. The valence electron around Iodine is 7, out of 7 electron, 5 electron will make single bond with one electron of chlorine.
Therefore, the valence electron around Iodine is 7, out of 7 electron, 5 electron will make single bond with one electron of chlorine.
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Give the name of the ion with 26 protons, 23 electrons.
Spell out the full name of the ion.
Part F
Why is it a good idea to perform three trials at each concentration? How
experiment to produce more reliable results?
Answer:
If one is analyzing a solution, for the best accuracy, the volume of titrant used should fall in the upper range of the burette that delivers the titrant. If one is using a 50 ml burette, one would like the volume to fall in maybe the 30 to 45 ml range. If on the first trial, the volume of titrant used is only a few ml, then a larger volume of solution being analyzed should be taken. If the volume of titrant exceeds 50 ml, then a smaller volume of solution should be taken. One should not need three trials. Based on the first trial, one should be able to determine the optimum volume of solution to be analyzed. If one is lucky, the optimum amount may occur on the first trial.
Two of the ingredients in Coca-Cola are caffeine and phosphoric acid. Draw the structure of caffeine. Would you expect caffeine to be soluble in an aqueous medium? What is the role played by phosphoric acid in Coca-Cola?
Caffeine is a water soluble molecule, so it would be expected to be soluble in an aqueous medium.
What is Caffeine?
In the methylxanthine class of stimulants, caffeine is a central nervous (CNS) stimulant. As a cognitive enhancer that improves alertness and attentional performance, it is primarily used recreationally. By preventing adenosine from binding to the adenosine A1 receptor, caffeine increases the release of the neurotransmitters acetylcholine. Caffeine can bind to and block adenosine receptors because of adenosine's similar three-dimensional structure. Additionally, caffeine raises levels of cyclic AMP by nonselectively inhibiting phosphodiesterase. The methylxanthine alkaloid caffeine is an angry, white crystalline purine that shares chemical similarities with the adenine as well as guanine bases of ribonucleic acid and deoxyribonucleic acid (DNA) (RNA).
Phosphoric acid is added to Coca-Cola to give it a tart flavor and to act as a preservative. It also helps to dissolve other ingredients, such as caffeine, which might otherwise be insoluble in the beverage.
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there are gas molecules that move slower than the average. the average speed of gas molecules decreases with decreasing temperature. the average kinetic energy of gas molecules decreases with decreasing temperature. all the gas molecules in a sample cannot have the same kinetic energy. the kinetic energy of a molecule cannot determine its speed.
A set of particles (atoms or molecules) that are constantly moving at random makes up a gas sample, according to the kinetic energy of a molecular theory.
Moreover, these gas particles' average kinetic energy solely depends on the temperature of the gas. With an increase in gas temperature, the average kinetic energy rises (this tells that the fifth statement is true). Despite the fact that certain gas molecules will always be travelling more quickly than others, the gas can still be represented by its average kinetic energy. Because kinetic energy is proportional to the square of the speed, the second claim—that the average speed of gas molecules rises with rising temperature—is derived from this.
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Using a drawing, compare the atomic radius of the following elements. Be sure your drawing ranks them from smallest radius to largest radius.
Potassium
Sodium
Sulfur
Selenium
The arrangement of the elements from smallest atomic radius to largest atomic radius is S < Se < Na < K
What is the atomic radius of an element?The atomic radius of an element is a measure of the size of the atom of an element.
The atomic radius of an element is calculated as one-half the distance between the nuclei of two covalently bonded atoms of the element. Atomic radius is one of the properties of an atom that show periodicity.
The periodicity of elements is the regular variation of the properties of an element across a period and down a group.
The atomic radius of atoms of elements increases down the group and decreases across a period.
Considering the atomic radius of the given element:
Potassium has the largest atomic radiusSodium has the next largest atomic radiusSelenium has the next largest atomic radiusSulfur has the least atomic radius.Learn more about atomic radius at: https://brainly.com/question/13126562
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asking questions about the behavior of ideal gases in terms of pressure, volume, temperature, and number of particles
Write a reflection about your learning in this portfolio. Your reflection should be at least 3 sentences. Use the following questions as a guide.
How did you design your investigation and plan to collect data?
What was the most difficult part of designing your investigation? Do you think your answer is the only right answer? Explain.
My reflection on idea gas behavior is that:
At higher temperatures and lower pressures, a gas typically behaves more like an ideal gas because the potential energy from intermolecular forces is less significant compared to the kinetic energy of the particles and the size of the molecules is less significant compared to the void space between them.What is the behavior of ideal gases in terms of pressure, volume and temperature?The way to design the investigation and plan to collect data is based on the true assumptions of :
The volume of the gas particles is quite small.The gas particles are of similar size and do not interact with one another through intermolecular forces (attraction or repulsion).The random motion of the gas particles is consistent with Newton's Laws of Motion.The most difficult part of designing your investigation is the gas behavior at different point or levels.
When held at a fixed temperature, the volume of a given quantity of gas is inversely proportional to the pressure at which it is measured.
Note that An ideal gas is one that abides with the gas laws under all possible pressure and temperature conditions. The gas must adhere to the kinetic-molecular theory in its entirety to achieve this. The gas particles must have no volume and must not interact with one another in any way that may be considered appealing.
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