Cindy's proposal is unsolicited, the indirect approach.
The inquiry method is characterized as a scholar-centered technique, this is, through this methodology the pupil is capable of constructing their personal way of studying. In this way, the scholar can expand hypotheses, talk with colleagues, and argue standards thru realistic experimental activities.
Inexperienced solvents are environmentally pleasant solvents, or bio solvents, which can be derived from the processing of agricultural crops. Using petrochemical solvents is the key to most people of chemical procedures but now not without intense implications on the environment.
Conceptual techniques: mastering through experience. Gaining knowledge through summary conceptualization by developing techniques and theories. Studying via lively experimentation. Learning via reflective commentary.
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How does hybridization of the atomic orbitals in the central atom of a molecule help lower the overall energy of the molecule?
The hybridization of the atomic orbitals in the central atom of a molecule lowers the overall energy of the molecule due to the maximization of the orbital overlap in the chemical bond.
What is the hybridization of the atomic orbitals?The hybridization of the atomic orbitals is a process in chemistry associated with the combination of two different atomic orbitals in a hybrid orbital after the formation of a particular molecule.
Therefore, with this data, we can see that the hybridization of the atomic orbitals depends on the formation of molecules.
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If an element has an atomic number of 15 then (a) the atomic mass must also be 15 (b) the atom has 15 electrons (c) there are 7 electrons in the outermost shell (d) the atom has 15 neutrons (e) the atom must have only one orbital
Answer:
if an element has atomic number of 15 then the atom has 15 electrons also.
Option (b)
Explanation:
remember the atomic number of an element is also the number of protons of that element, we know that protons have a positive charge, neutrons have no charge and electrons have a negative charge.
we also know that an element is atomically neutral, meaning it overall has no charge, this is because the positive proton attracts a negative electron and hence their charges cancel off.
this is why in all elements, the atomic number(proton number) will always be equal to the electron number.
Note the neutron number cannot be predicted this way, as far as I know, the neutron purpose is mainly to add Mass to the atom so that it can be more stable, though often times the neutron number is similar to the proton number also. You're not required to learn off atomic masses as far as I know because it will be given to you in the exams
the diagrams above represent solutes present in two different dilute aqueous solutions before they were mixed. water molecules are not shown. when the solutions were combined, a precipitation reaction took place. which of the diagrams below is the best particle representation of the mixture after the precipitation reaction occurred? responses
We can see from the images attached that a precipitate of silver chloride is formed as shown.
What is a precipitate?We know that a precipitate is a substance that that separates out of the solution as a solid. Thus if we have an aqueous phase reaction in which there is the combination of two of the reactants which are aqueous solutions. However, when the substnaces are mixed, we obtain a product that is solid. This solid product is whet we call the precipitate of the reaction that has just taken place.
As I said the precipitate would tend to separate out of the solution and then when that happens, we can see that the solid would be in a distinct phase from the rest of the solution.
In this case, the mixture of the sliver nitrate and the sodium chloride would produce a silver chloride precipitate that would separate out of the solution.
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li2s lewis structure
If a liquid is sealed in a container, kept at a constant temperature, how does vapor pressure change over time?.
If a liquid is sealed in a container and kept at constant temperature, how does its vapor pressure change over time?
a. It continues to steadily increase.
b. It increases at first, then remains constant.
c. It increases at first, then decreases.
d. It continues to steadily decrease.
Answer
The vapor pressure of the container sealed with liquid will increase first and then it will remain constant when kept at constant temperature.
Explanation
The vapor pressure in the container containing liquid will increase at first then remain constant. This trend of vapor pressure follows because pressure and vapor is generated by heat. Since the heat container is constant as it is kept at a constant temperature the pressure changes accordingly to the temperature and will remain there unless it is released.
Hence, the vapor pressure of the container containing liquid which is kept at constant temperature increases and remain constant.
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Do the figures in this partial periodic table demonstrate the trend in atomic radius, ionic radius, or neither of these? Relate your answer to the structure of atoms across the periodic table
Connect your responses to the atomic structures shown on the periodic table. Ionic distance. This is due to the fact that as you move to the right on the periodic table, the numbers get gradually smaller.
How important is the periodic table ?Its historical use to encourage filling in the gaps left the Mendeleev that led to the discovery of novel, interesting elements with numerous applications in daily life is where its greatest significance resides. Many of the metals and useful substances we now take for given would not have been found without it.
What makes the periodic table so amazing?To sum up, the table is crucial because it is set up to offer a wealth of knowledge on elements and their interactions in a single, convenient reference. Even qualities of metals that are yet to be found can be predicted using the table.
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Balance the reaction for the combustion of heptane:
?C7H16+?O2??CO2+?H2O
Enter the four coefficients in order, separated by commas (e.g., 1,2,3,4), where 1 indicates the absence of a coefficient.
The balanced chemical equation for the combustion reaction of heptane is:
[tex]C_7H_16+11O_2\longrightarrow 7CO_2+8H_2O[/tex]
What is the balanced chemical equation?The chemical equation in which the number of atoms of each type of element is equal on the reactant, as well as the product side of the equation, is known as a balanced chemical equation.
From the law of conservation of mass, the total mass of the elements on either side of the equation must be equal in a balanced chemical equation.
Given the combustion reaction of heptane can be represented as:
[tex]C_7H_16+11O_2\longrightarrow 7CO_2+8H_2O[/tex]
Therefore, the coefficients required to balance the chemical equation are 1, 11, 7, and 8.
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Which of the following is not a common cost flow assumption used in costing inventory? a. Average cost b. Middle-in, first-out c. Last-in, first-out d. First-in, first-out
Middle-in, first-out is not a common cost flow assumption used in costing inventory.
Explain 3 cost flow assumptions?
Companies utilize the average cost flow assumption to determine the costs associated with terminating inventory, cost of goods sold (COGS), and inventory in storage. Over the course of the accounting period, all items sold from inventory are averaged, and the average cost is then applied to the items.
Know that FIFO, LIFO, and averaging are the three cost flow assumptions that are most common in the US. Recognize the purpose of the LIFO conformity rule and that the existence of this tax rule is a major contributor to the usage of LIFO in the United States.
Therefore, Option B is correct.
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the cataylic triad is typically found in a wide range of enzymes that do hydrolysis draw the curved arrows to show how serine is converted to a better nucleophile
The catalytic triad of serine, glutamic or aspartic acid, and histidine is present in serine esterase's
What is catalytic triad?
A trio of coordinated amino acids known as a catalytic triad can be found inside the active site of certain enzymes. The most typical catalytic triads in enzymes are those in hydrolase and transferase. A typical motif for producing a nucleophilic stains for covalent catalysis is an acid-base-nucleophile triad. A charge-relay network is formed by the residues to polarise as well as activate this same nucleophile, which then attacks the substrate and forms a covalent intermediate that is hydrolyzed to start releasing the product but also regenerate free enzyme. The amino acid serine or cysteine is the nucleophile most frequently, but threonine and even selenocysteine can occur.
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Analyze The IR Spectrum For Camphor And Compare With The Literature Value.
The analysis of the IR Spectrum for Camphor depicts that there are peaks around 1780 cm-1 that show C=O stretching, 3000 cm-1 that shows C-H stretching, 1450 cm-1 and 1375 cm-1 that show CH2 and CH3 stretching, and 1050 cm-1 that shows C-O stretching.
What does IR mean in the spectrum?A popular absorption technique for both qualitative and quantitative evaluations is infrared (IR) spectroscopy. Electromagnetic radiation that can change the rotational and vibrational states of covalent bonds in organic molecules is found in the infrared portion of the spectrum.
The "Tongues" and "Swords" Are The Main Things To Look For In An IR Spectrum.
Is there a broad, rounded peak in the 3400-3200 cm-1 range? There are hydroxyl groups (OH) present.
Is there a strong, abrupt peak in the area between 1850 and 1630 cm-1? That is where carbonyl groups (C=O) appear.
Camphor is a waxy, colorless substance with a potent scent. It is categorized as a cyclic ketone and terpenoid.
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in order to secure reliable sources of rubber, tin, rice, scrap iron and liquid fuel, japan decided it must
In order to secure reliable sources of rubber, tin, rice, scrap iron and liquid fuel, japan decided it must both seize much of southeast asia and attack united states pacific bases in hawaii and elsewhere
When first created, natural rubber, also known as caoutchouc or India rubber, is made of polymers of the organic compound isoprene, along with water and trace amounts of other organic compounds. The top two producers of rubber are Thailand and Indonesia. Elastomers are a category for different types of polyisoprene that are used as natural rubbers. At the moment, rubber is mostly obtained from rubber trees or other sources as latex. Making incisions in the bark and collecting the fluid in vessels is a process known as "tapping," which removes the latex, a sticky, milky colloid. The rubber created from the refined latex is then ready for industrial processing. Latex is allowed to coagulate in the collection cup in major areas.
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The density of gold is 19.3 g/cm3. a. What is the volume, in cubic centimeters, of a sample of gold that has a mass of 0.715 kg? b. If this sample of gold is a cube, what is the length of each edge in centimeters?
A measure of how compact matter is is what density means. How much "stuff" is crammed into an area, to put it simply.
What is Density?In science, density is defined as the ratio of an object's mass to volume. Mathematical and scientific density comparisons are done using a formula.
In disciplines, such as physics, the focus is on things and matter and relates the notion to the rules of nature.
It is a calculable and manipulable formula in mathematics. In other disciplines, such as social sciences, density relates with population. The amount of people in a specific land area produces the population density.
Therefore, A measure of how compact matter is is what density means. How much "stuff" is crammed into an area, to put it simply.
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Describe the orbital diagram of an atom with eight electrons. Explain how this orbital diagram demonstrates Hund's rule.
The orbital diagram of the eight electron atom is shown in the image attached.
What is Hund's rule?The Hund's rule states that the electrons that are found in atom must be filled singly first before pairing can occur. In this case we are dealing with an atom that has a total of eight electrons.
In looking at the orbital diagram, we are going to observe that the five orbitals would first be filed then we would now start to pair the orbitals until we fill in all of the eight electrons as shown in the image attached.
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Answer:
We have an electron that has six electrons, and there are two electrons that singly occupy the 2p orbitals. According to Hund's rule, electrons arise singly in an atom before pairing occurs.
Explanation:
BONUS: What process does this chemical reaction represent? 6CO2 + 6H2O —> C6H12O6 + 6O2
identify the sugars in amygdalin.
Answer:
It consist of glucose. To be specific, it had two molecules of glucose known as benzaldehyde and hydrocyanic acid.
Explanation:
Amygdalin is a white, bitter-tasting, water-soluble, glyosidic power, C20H27NO11, usually obtained from bitter almond seeds and the leaves of plants of the genus Prunus and related genera: used chiefly in medicine as an expectorant.
Now let's go onto the others.
Glucose is a sugar, C6H12O6, having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits, animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotatory from (laevoglucose, or -glucose) not naturally occurring.
The benzaldehyde molecule contains a total of 14 atom(s). There are 6 Hydrogen atom(s), 7 Carbon atom(s) and 1 Oxygen atom(s) A chemical formula of benzaldehyde can therefore be written as:C7H6O.
A solution of hydrogen cyanide in water, represented as HCN, is called hydrocyanic acid. Hydrogen cyanide is a colorless, poisonous bas, HCN, having a bitter almond like odor: in aqueous solution it forms hydrocyanic acid.
Thank you,
Eddie
Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas.
The Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas is 2Na+F₂→2NAF.
What is Sodium chloride ?
One of the most prevalent minerals on Earth and a crucial nutrient for many animals and plants is sodium chloride (NaCl), also known as salt. Seawater and underground rock formations are two natural sources of sodium chloride.
What is fluorine?
The most reactive element in all of chemistry is fluorine (F), which is also the first member of the halogen family. Both fluorides and fluorides-containing compounds, both organic and inorganic, are referred to by the terms "fluoride" and its ionic form (F-), respectively.
∴2Na+F₂→2NAF
Therefore, Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas is 2Na+F₂→2NAF.
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select whihc of the following standard entahlpy of formation values is not zer oat 25 mn ch4 fe cl2 n2
The standard enthalpy of formation for CH4, Fe, and Cl2 are all zero. The standard enthalpy of formation for N2 is not zero, as it is equal to -57.6 kJ/mol.
What is enthalpy?
A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's functional energy to the product of the its pressure and volume. It is a state function that is frequently used in measurements of chemical, biological, as well as physical systems at constant pressure, which the sizable surrounding atmosphere conveniently provides. The pressure-volume term describes the effort needed to create space for the system by displacing it's own surroundings in order to determine its physical dimensions. For solids and liquids under typical conditions, the pressure-volume word is very small, whereas it is only moderately small for gases. Therefore, enthalpy serves as a stand-in for energy throughout chemical systems; enthalpy differences are what are commonly referred to as bond, lattice, and solvation "energies" in chemistry.
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A 250-L tank is evacuated and connected to a 50.0-L bulb filled with compressed argon. After they are joined, the pressure in the bulb falls to 2.20 atm. If the temperature remains at 25 °C throughout the process, what was the initial pressure in the 50.0-L bulb?
The initial pressure in the 50.0L bulb is 2.75 atm.
What is Boyle's Law?According to Boyle's law in a constant temperature, the volume of a gas is inversely proportional to its pressure.
V ∝ 1/P
PV = constant.
It is given to us, Initial volume(V) = 250L and Final volume(V') = 50.0 L
Say final pressure is P', that implies initial pressure P = P'- 2.20
Now, according to the concept of Boyle's law, PV = P'V'
⇒P' = PV/V'
⇒P' = (P'-2.20)*250 / 50
⇒P' = 2.75 atm
So, the initial pressure in the 50.0L bulb is 2.75 atm.
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find the boiling points of the six compounds that you will study: o-dichlorobenzene, 2-bromo- 2-methylbutane, benzene, p-xylene, 4-methyl-2-pentanol, and decane. predict their order of elution.
The separation compound using diffrence in boiling point melting point like physical properties.
What is physical properties.
A physical property is the any measurable property that whose value describes the state of a physical in system. Changes in the system's physical properties of can be used to describe its transitions between the momentary of state.
A physical property is a characteristic of the matter that is not associated with in a change in its chemicals composition. Familiar to the examples of physical properties that is include density, color, hardness, melting and boiling points, and the electrical conductivity.
There are mainly two types of physical properties extensive and intensive.
Sol-The separation scheme to used to separate the mixture of based on differences in this physical properties- such as boiling point melting point, solubility in a given solvent these are the three components.
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how is the HFusion used to calculate the mass of solid that 1kJ of energy will melt?
The equation to use Hfusion to calculate the energy needed to melt a mass of solid is Grams solid × mol/g × H fusion
what is Hfusion?
The heat of fusion is the amount of heat required to turn 1 g of solid into a liquid without causing a change in temperature.
1Kg×1/H fusion ×g/mol solid
Numerous everyday household products have been produced using the heat of fusion technique, which has numerous other uses. Melting ice into water is the most typical application of the heat of fusion. Manufacturing is where you'll find the great majority of instances of heat of fusion in use. The following examples have been in use for many centuries and are still refined today. Heat of fusion is a necessary step in the production of things such as coins, glass, forged metal, and household goods made from blow-molded plastic.
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A ga balloon ha a volume of 90. 0 liter when the temperature i 39 °C and the preure i 740. 0 mmHg. What would it volume be at 15. 0 °C and 780. 0 mmHg?
The volume of gas is 32.84 L.
given that :
Volume V1 = 90 L
Temperature T1 = 39 °C
pressure P1 = 740 mmHg
Volume V2 = ?
Temperature T2 = 15 °C
pressure P2 = 780 mmHg
according to the ideal gas equation we get :
P1 V1 / T1 = P2 V2 / T2
V2 = (P1 V1 T2) / P2 T1
V2 = ( 740 × 90 × 15 ) 780 × 39
V2 = 32.84 L
Thus, A ga balloon ha a volume of 90. 0 liter when the temperature i 39 °C and the pressure i 740. 0 mmHg. it volume be at 15. 0 °C and 780. 0 mmHg is 32.84 L
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a chemistry student is given of a clear aqueous solution at . he is told an unknown amount of a certain compound is dissolved in the solution. the student allows the solution to cool to . at that point, the student sees that a precipitate has formed. he transfers the liquid to a clean new beaker and throws away the precipitate. the student then evaporates the water from the liquid in the new beaker under vacuum. it weighs . using
The Solubility cannot be calculated.
Solubility indicates the maximum amount of a substance that can be dissolved in a solvent at a certain temperature. Such a solution is called saturated. Divide the mass of the compound by the mass of the solvent and multiply by 100g to calculate the solubility in g/100g.
The solubility of ionic solutes does not always increase with increasing temperature. In exothermic solution reactions, solubility can decrease with increasing temperature. The number of moles of solute dissolved in a given volume of solution does not represent the solubility of the solution. They dissolve more readily and solubility increases with increasing temperature.
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use the octet rule to predict the formula of the compound that would form between sulfur and fluorine , if the molecule contains only one sulfur atom and only single bonds are formed.
SF2 is the formula of the compound that would form between sulfur and fluorine , if the molecule contains only one sulfur atom and only single bonds are formed.
We employ the octet rule, which stipulates that all atoms in a compound are required to comply by, to confirm the correctness of any chemical structure. Every atom in the carbon IV oxide model exactly complies with the octet rule. The valence shell of each atom in the molecule is surrounded by eight electrons.
Its negative charge, which is 1.602176634 coulombs, the basic unit of electric charge, is equivalent to its own negative charge. The rest mass of an electron is 9.1093837015 10-31 kg, or 1/1,836 the mass of a proton. Because of this, an electron is thought to have far less mass than a proton or neutron, and its mass is ignored when calculating an atom's mass.
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In the next three problems, we will attempt to solve the problem: What is the standard entropy change for the combustion of 1 mole of diamond at room temperature?C (s, diamond) +O2( g)→CO2
For the combustion of 1 mole of diamond at room temperature, the standard entropy change is 6.22 J/K mol.
The reaction is given as :
C (diamond) + O₂ -----> CO₂
At room temperature the value of S° is given as follows :
carbon, C = 2.38 J / Kmol
oxygen, O₂ = 205.2 J/Kmol
carbon dioxide, CO₂ = 213.8 J/Kmol
The standard entropy change is given as :
ΔS° = ∑S° product - ∑ S° reactant
ΔS° = ( 213.8 ) - ( 2.38 + 205.2)
ΔS° = 213.8 - 207.58
ΔS° = 6.22 J / K mol
The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22 J / K mol.
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consider the enthalpy of formation for c3h8(g) a. write the balanced chemical equation describing the heat of formation of c3h8(g).
The enthalpy of formation for C₃H₈ is -394,286 kJ/mol.
Definition of enthalpy of formation
Enthalpy of formation also known as the heat of formation and also called standard heat of formation, enthalpy of formation, or standard enthalpy of formation is the amount of heat absorbed or evolved when one mole of a compound is formed from its constituent elements and each substance being in its normal physical state (gas, liquid, or solid).
The balanced chemical equation describing the heat of formation of C₃H₈.
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
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thermal caused by a rising temperature of the ocean, and water being added by the melting of land-based ice, are two important causes of sea-level rise.
Thermal expansion caused by a rising temperature of the ocean, and water being added by the melting of land-based ice, are causes of sea-level rise.
Temperature is the unit used to describe heat or cold. It illustrates the natural flow of heat energy from a hotter to a cooler body and can be expressed in terms of a variety of arbitrary scales (one at a lower temperature). An iceberg has a much higher total heat energy than a match, despite the fact that a match burns at a much higher temperature. Temperature and a thermodynamic system's energy are not the same thing. In contrast to extensive features like mass or volume, such as temperature is referred to as an intense property—one that is independent of the amount of material being addressed—along with pressure, density, and other similar qualities.
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Which of the following types of infiltration techniques does one open up to by posting sensitive personal information and details about one's workplace on social networking sites? Password theft Social engineering Physical threats Phishing Virus infections
Social engineering types of infiltration techniques does one open up to by posting sensitive personal information and details about one's workplace on social networking sites.
What is the which means social engineering?
Social engineering is an assault vector that is predicated closely on human interplay and frequently includes manipulating human beings into breaking regular safety techniques and satisfactory practices to benefit unauthorized get entry to systems, networks or bodily places or for economic benefit.
Is social engineering a cybercrime?
Social engineering is a manipulation approach that exploits human blunders to benefit personal information, get right of entry to, or valuables. In cybercrime, these “human hacking” scams generally tend to trap unsuspecting customers into exposing data, spreading malware infections, or giving get right of entry to constrained systems.
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a. What is metallic bonding? b. How can the strength of metallic bonding be measured?
Metallic bonding is described as a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons and positively charged metal ions.
The strength of metallic bonding can be measured via the metal's enthalpy of vaporization.
What is the enthalpy of vaporization?
The enthalpy of vaporization is described as the heat required to vaporize a material at constant pressure.
Metallic bonding is often described as an array of positive ions in a sea of electrons in which the metal is held together by the strong forces of attraction between the delocalized electrons and the positive ions.
The properties of metals that are a consequence of metallic bonding include:
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Can someone help me please!!!!???
Part #1
Answer:
which question do you need assistance with?
Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: c: 44. 4 percent; h: 6. 21 percent; s: 39. 5 percent; o: 9. 86 percent. Calculate its empirical formula. What is its molecular formula given that its molar mass is about 162 g?.
The molecular formula of the Allicin is, C₁₈H₃₀S₆O₃ and the empirical formula is C₆H₁₀S₂O
the molecular formula can be calculated as follows:
If a percentage is provided, we will assume that the entire mass is 100 grams.
As a result, each element's mass is equal to the percentage indicated.
C weighs 44.4 g.
H weighs 6.21 g.
S weighs 39.5 g.
O's mass is 9.86 g.
C has a molar mass of 12 g/mole.
H has a molar mass of 1 g/mole.
S has a molar mass of 32 g/mole.
O has a molar mass of 16 g/mole.
first, convert given masses into moles.
Moles of C = mass C = 44.4 g = 3.7 moles
molar mass C 12 g/mole.
Moles of H = mass H = 6.21 g. = 6.21 moles
molar mass 1 g/mole.
Moles of S = mass S = 39.5 g. = 1.23 moles
molar mass 32 g/mole.
Moles of O = mass O = 9.86 g. = 0.62 moles
molar mass 16 g/mole.
then we find the mole ratio by divide each value of moles by the smallest number of moles calculated.
For C = 3.7 moles = 5.96 ≈ 6
0.62 moles
For H = 6.21 moles = 10.01≈ 10
0.62 moles
For S = 1.23 moles = 1.98 ≈ 2
0.62 moles
For O = 0.62 moles = 1
0.62 moles
The ratio of C : H : S : O = 6 : 10 : 2 : 1
The Empirical formula is C₆H₁₀S₂O
The empirical formula weight = 6(12) + 10(1) + 2(32) + 1(16) = 162 gram/eq
Now we have to calculate the molecular formula of the compound.
Formula used :
n= molecular formula = 486 =3
empirical formula 162
Molecular formula = (C₆H₁₀S₂O)₃ =C₁₈H₃₀S₆O₃
Therefore, the molecular of the compound is, C₁₈H₃₀S₆O₃
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