when 50 ml of 0.10 m naf is added to 50 ml of 0.10 m hf, relative to the ph of the 0.10 m hfsolution the ph of the resulting solution willa. remain the sameb. become 7c. increased. decrease
When 50 ml of 0.10 m NaF is added to 50 ml of 0.10 m HF, relative to the pH of the 0.10 m HF solution the pH of the resulting solution will increased. the option c increased is correct.
The pH is the measurement for the solution that it is acidic or the basic or it is neutral. the pH scale ranges from 0 to 14 in the scale. the pH value in the 7 is for the neutral solution. that means it is neither basic nor acidic. the pH value greater than 7 will be the basic solution. the pH value in the pH scale less than 7 is for the acidic solution.
Thus, the pH will increases as compared to the value of the 0.10 M HF. the option c is correct.
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The molecular weight of urea is 60.07. Do you think urea will diffuse through the 20 MWCO membrane?
Urea will not diffuse through the 20 MWCO membrane because they are big in size than the pores of the membrane.
What is diffusion?Diffusion can be described as the net movement of anything generally from a region of higher concentration to an area of lower concentration. Diffusion can be driven by a gradient in chemical potential or Gibbs free energy.
A gradient can be described as a change in the value of a quantity, for example, concentration, temperature, or pressure with a change in another variable, distance.
Dialysis also works on the principles of the diffusion of solutes across a semi-permeable membrane. Diffusion can be defined as a property of substances in water where substances tend to move from an area of high concentration to a low concentration.
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what is a characteristic of UDP
Answer:
Explanation: This protocol works connectionless, thus allowing the sending of datagrams even before a connection has been established between sender and receiver. Datagrams are sent to the IP address established by the sequence, specifying which will be the destination port.
Write the formula for each of the following:
a. tin(II) carbonate
b. lithium phosphide
c. silicon tetrachloride
d. manganese(III) oxide
e. bromine
f. calcium bromide
Hope this answer helps you
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
Which phenomena support only the particle theory of light? select 2 options. reflection bending around objects traveling in a straight path interference photoelectric effect
Photoelectric effect is the answer
Light is made of particles and with help of them the particle theory of light explains the light. Newton concluded that light has frequency-like properties. According to this the particle theory of light supports the phenomenon of light bending around objects.
Albert Einstein conducted research on the photoelectric effect, in which electrons fly out of a metal surface exposed to light and energy of the electrons that fly out of the metal does not change whether the light is weak or strong.
Photoelectric effect is defined as an emission of electrons when electromagnetic radiation hits the material.
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Answer:
traveling in a straight path and photoelectric effect
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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As you have seen; lead can form the same kinds of compounds as the alkaline earth metals. Nevertheless, the solubility may differ markedly: Give a convincing reason:
The solubilities of lead is different.
The lead compounds are more covalent in character, and also have a considerable high bond strength which means (aka lattice enthalpy).On the other hand lead compounds are insoluble, this energy is too high for hydration enthalpies (the energy released when water surrounds an ion of either charge).
Consider the position of Pb in the periodic table and the position of the Alkali Earth metals.
Alkali Earth Metals occupies noble-gas configuration when they are doubly charged cations.
Lead however is on the right hand side, and would like to have more electrons to get converted to get stable configuration; making the bonds in lead-compounds more covalent -as well as stronger- in nature.
The lattice enthalpies of insoluble compounds always have higher than the enthalpy of solvation.
Now, since Alkali Earth metals always like to be in ionic states; their compounds will dissolve in general more easily than the same compounds with lead, usually the lattice energy of lead compounds is much higher (In case of insoluble compounds higher than the energy that would be released upon solvation, which thus doesn't occur).
Thus, we can conclude with the fact of different solubilities.
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If sufficient HCL is present, the reaction will go to completion, and all the Zinc will be used up. Explain how this is an illustration of LeChatelier's principle. Zn(s)+2HCL(l)-----> ZnCL2 + H2(g) Please provide a clear explanation. Thank you.
When concentration of HCl increases, reaction moves in such a way so as to decrease the concentration of HCl. Reaction moves forward to consume HCl and zinc will be used up. Reaction will form more products and goes to completion.
What does Lechatelier's principle state?
Le Chatelier's principle can be stated as follows: A change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of this change.
What are the three elements concerned in Le Chatelier's principle?
There are 3 chemical modifications to a gadget that Le Chatelier's Principle addresses: concentration, pressure, and temperature. Concentration modifications show up while the variety of reactants or merchandise are both accelerated or decreased.
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ordering question click and drag on elements in order rank the following 0.1 m salt solutions in order of increasing ph (lowest ph at the top of the list).
NaHSO4 <NH4NO3<NaHCO3<Na2CO3 salt solutions in order of increasing ph (lowest ph at the top of the list).
The pH scale determines how basic or acidic aqueous or other liquid solutions are. The expression converts the hydrogen ion concentration, which typically ranges between 0 and 14, into values between 1 and 1014 gram-equivalents per litre. It is widely employed in the fields of biology, agronomy, and chemistry. Because it has a pH of 7, or 107 gram-equivalents of hydrogen ions per litre, pure water is neutral (neither acidic nor alkaline).
In an aqueous solution, the amount of hydrogen ions expressed in equivalents per litre is equal to log(H+). Since it indicates which crops will thrive there, a soil's pH is probably the most significant factor affecting its moisture content in agriculture.
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Give the name of the ion with 26 protons, 23 electrons.
Spell out the full name of the ion.
which atom is matched with the correct formal charge?
a. s in socl2, b. 1 br in bro3-, c. zero n in no3-,
d. zero n in no2f, e. zero o in h3o
1 br in bro3- the correct formal charge.
How can you determine an atom's formal charge?For each atom in a Lewis structure, you should count how many electrons it "owns" in order to get the formal charges. All of its lone pair electrons as well as 50% of its bonding electrons should be counted. The formal charge is the discrepancy between the atom's number of valence electrons and the number it possesses.
What kind of atom has a formal charge of 1 in this molecule?When the carbon atom has three bonds in addition to one lonely pair of electrons, carbonions are created. Carbanions have a formal charge of 1 and 5 valence electrons.
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a voltaic cell utilizes the following reaction: 2fe3+(aq)+h2(g)→2fe2+(aq)+2h+(aq).
Answer:
.77
Explanation:
Just did it
Compare and contrast one mole of a compound and Avogadro's number of particles in a compound. What is the conversion factor between the two?
One mole of a compound is a unit of measurement that represents 6.022 x 10^23 particles of a compound. This number is also referred to as Avogadro's number and is the ratio of particles to moles in a given compound.
What is Avogadro's number?
The proportionality factor that connects the number of constituent particles (typically molecules, atoms, or ions) in a sample with amount of substance in that sample is called the Avogadro constant, also known as NA or L. It has an exact value of 6.022140761023 reciprocal moles and serves as a SI defining constant. Stanislao Cannizzaro named it after the Italian scientist Amedeo Avogadro, who explained this number at the Karlsruhe Congress in 1860, four years after Avogadro's passing. The Avogadro number is a dimensionless number that represents the Avogadro constant as a numerical value expressed in reciprocal moles. The Avogadro number, or Nor N0 in older literature, is the exact number of particles (6.022140761023) that make up one mole.
One mole of a compound is a unit of measurement that represents 6.022 x 10^23 particles of a compound.
This number is also referred to as Avogadro's number and is the ratio of particles to moles in a given compound.
The conversion factor between one mole and Avogadro's number of particles is 1:6.022 x 10^23.
This means that for every one mole of a compound, there are 6.022 x 10^23 particles of that compound.
In other words, one mole of a compound is equal to Avogadro's number of particles in that compound.
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1.Predict the bond order for the molecule Al2, which forms in laser vaporized aluminum. Would Al2 be paramagnetic or diamagnetic?
Bond order [tex]=[/tex]
If a fraction is needed, use a decimal number.
Al₂ is diamagnetic in nature.
Bond order of Al₂ is 1
What is molecular orbital theorem (MOT)?The molecular orbital hypothesis claims that each atom prefers to mix with others to create molecular orbitals. As a result of this arrangement, electrons may be found in a variety of atomic orbitals and are often connected with diverse nuclei.
Atomic number of Aluminium (Al) = 13
So, Al₂ = 13+13 = 26 electrons
Thus, electronic configuration of Al₂ according to molecular orbital theory (MOT):
σ(1s)² > σ*(1s)² > σ(2s)² > σ*(2s)² > σ(2pz)² > Π(2px)² = Π(2py)² > Π*(2px)² = Π*(2py)² > σ*(2pz)² > σ(3s)² > σ*(3s)² > σ*(3pz)²
So, Al₂ is not having any unpaired electrons, therefore it is diamagnetic in nature.
Now, bond order (B.O) = 1/2 × (Bonding electron - Anti-bonding electron)
= 1/2 × (14-12)
= 2/2
= 1
So, Al₂ is diamagnetic in nature and Bond order is 1.
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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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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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Als) → A13+ (aq) + 3 e-
Sn2+ (aq) + 2e- → Sn(s)
based on the half-reactions represented above, which of the following is the balanced ionic equation for the oxidation-reduction reaction between al(s) and sn2+(aq) ?
The balanced ionic equation for the oxidation reduction reaction between Al(s) and Sn2+(aq) is 3 Al(s) + 2 Sn2+ (aq) → 3 Al3+(aq) + 2 Sn(s)
what is redox reaction balancing?
To counteract this, we will separately write each oxidation and reduction reaction and explicitly mention the quantity of electrons in each. Half reactions are what are known as the oxidation and reduction processes separately.
Als) → A13+ (aq) + 3 e-
Sn2+ (aq) + 2e- → Sn(s)
3 Al(s) + 2 Sn2+ (aq) → 3 Al3+(aq) + 2 Sn(s)
The half reactions will then be combined into a full reaction, which should then be balanced, by doing multiples of each reaction until the quantity of electrons on each side totally cancels. The half reaction method is the name for this technique for redox reaction balancing.
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Which of the following compounds would you expect to be soluble in water? PbCO3, Ag2CO3, CuCO3, K2CO3)
Answer:
Explanation:
the answer is K2CO3 if its not im sorry
Copper crystallizes in a face-centered cubic lattice (the cu atoms are at the lattice points only). If the density of the metal is 8. 96 g/cm3, what is the unit cell edge length in pm?.
The unit cell edge length in pm is 361 pm.
given that :
the density of the metal , ρ = 8.96 g/cm³
atomic mass = 63.54 g/mol
the atomic cell = 4 atoms
Avogadro's number = 6.022 × 10²³ atoms/mol
the expression is given as follows :
cell volume = (atoms × atomic mass ) / density × Avogadro's number)
= ( 4 × 63.54 ) / 8.96 × 6.022 × 10²³)
= 4.71 × 10⁻²³ cm³
a = ∛4.71 × 10⁻²³ cm³
a = 361 pm
The unit cell edge length is 361 pm.
Thus, Copper crystallizes in a face-centered cubic lattice (the cu atoms are at the lattice points only). If the density of the metal is 8. 96 g/cm3, the unit cell edge length in pm is 361 pm.
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chemical reactions are used so often in cooking. besides pickling, find 3 more examples where a chemical reaction has taken place in cooking.
Chemical reactions are used so often in cooking. besides pickling, some of the examples are Caramelization happens that's a form of chemical response, whilst we warmness sugar.
Heating a meat adjustment its colour to brownish because of Maillard response. -Baking the bread makes them upward push because of the formation of carbon dioxide bubbles throughout the response among baking powder and liquid ingredients.
What is chemical reaction?
In a systematic sense, a chemical procedure is a technique or manner of come what may converting one or greater chemical substances or chemical compounds. Such a chemical procedure can arise through itself or be because of an outdoor force and entails a chemical response of a few sorts.
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disulfur heptoxide chemical formula
Answer:
The formula of disulfur heptoxide is S2 O7
A strip of paw paw was placr in a beaker of water.After 30 minutes what happen to the strip?
Anything that moves in a net direction from a region of higher concentration to a region of lower concentration is said to be diffusing. Because the particles in liquids and gases travel randomly from one location to another, diffusion occurs in these media.
What is diffusion ?Diffusion is the overall net movement of anything from a higher concentration to a lower concentration. A gradient in the Gibbs free energy or chemical potential drives diffusion.
The molecules' kinetic energy causes random motion, which causes diffusion. This mechanism happens in simple diffusion without the help of a transport protein. The molecules travel from an area of high concentration to an area of low concentration due to their random mobility.
Thus, Because the particles in liquids and gases travel randomly from one location to another, diffusion occurs in these media.
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Solutes are returned to the blood during: _________
During tubular reabsorption, solutes are transferred back to the circulation. Glomerular filtration involves the passive transfer of small substances from the blood towards the filtrate.
The location of tubular reabsorptionThe second crucial step in the production of urine is tubular reabsorption. Many of the glomerular filtration of solutes needed for proper bodily operation, like amino acids, glucose, et salts, begins in the proximal section of the tubule.
What are tubular reabsorption and secretion?The reverse of reabsorption, tubular secretion is the movement of substances from peritubular capillaries into the renal tubular lumen. Passive diffusion and active transport are the main causes of this secretion. Usually, only a small number of substances—usually waste products—are excreted.
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Radio wave in the AM region have frequencie in the rang 539 to 1700 kilocycle per econd (530 to 1700 KHz). Calculate the wavelength correponding to a radio wave of grequncy 1460000/ (that i 1460 KHz)
The wavelength is 241.77m.
What is frequency?
Hertz gives the frequency at which a recurring event occurs once every second (Hz). The number of vibrations or cycles per unit of time is the definition of frequency, as we are all aware.
What is wavelength?
A wave's wavelength is the separation between its successive crests, notably between the points of an electromagnetic wave.
frequency = 1.240*10^6 s^-1
speed of light = 2.998*10^-8 m/s
λ = wavelength
C= λv
λ=c/v
λ= 2.998*10^-8 m/s/1.240*10^6 s^-1
λ= 241.77m
Therefore, wavelength is 241.77m.
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Draw the Lewis structure for BrF5. The hybridization on the Br is (sp, sp2, sp3, sp3d, sp3d2). The molecule is (choose one: polar or nonpolar)
The hybridization on the Br in BrF₅ is sp³d². the molecule is polar molecule .
The hybridization of bromin pentafluoride , BrF₅ sp³d² hybridize. in the structure of BrF₅ the boromine contains one lone pair of electron. the lewis structure is shown as follows :
F
|
F - Br : - F
| |
F F
the valence electron the Br atom are 7 valence electron out of which 5 are making bonds with the fluorine atom. two of them are present as lone of electrons. one s , three p and two d orbitals are taking part in hybridization . BrF₅ is the polar molecule as the difference in electro negativity in Br and the F atom contributes to the unequal charge distribution.
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hydroiodic acid
Express your answer as a chemical formula.
The chemical formula of hydroiodic acid is HI.
What is chemical formula?Chemical formula is as used in chemistry is a notation indicating the number of atoms of each element present in a compound. It shows the type and number atoms of an element present in a compound.
For example, the molecular or chemical formula for ethane is C₂H₆.This shows that ethane contains 2 carbon atoms and 6 hydrogen atoms.
Hydroiodic acid is a compound made up of two elements namely;
HydrogenIodineTherefore, the chemical formula for hydroiodic acid is HI.
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Carbon disulfide has a vapor pressure of 363 torr at 25 ∘ C and a normal boiling point of 46.3 ∘ C . Find Δ H v a p for carbon disulfide.
The ΔHvap for carbon disulfide is 26.06J.
Derivation of the Clausius Clapeyron Equation in ThermodynamicsAs the temperature rises, so does the water vapor saturation pressure. The rate at which vapour pressure rises for each degree that the temperature rises is determined by the Clausius-Clapeyron equation. Specify p as the saturation vapour pressure and T as the temperature.
In honor of Rudolf Clausius and Benoît Paul Émile Clapeyron, the Clausius Clapeyron equation is a way of explaining a discontinuous phase transformation between two phases of matter of a single constituent. There is no direct relationship between a liquid's temperature and vapour pressure.
Clausius-Clapeyron Equation,
In P = RT/ΔHvap + C
Given,
P = 363 torr,
R = 8.314
T = 46.3°C
C= 25°C
363 = 8.314×46.3/ΔHvap + 25
363 = 384.9/ΔHvap +25
ΔHvap = 384.9/363 + 25
ΔHvap = 26.06J.
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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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Elements In Group Have A Np6 Electron Configuration In The Outer Shell.
(a) 6A
(b) 7A
(c) 5A
(d) 8A
(e) 4A
Elements in group 8A have a np6 electron configuration in the outer shell. Therefore, the correct answer option is: (d) 8A.
What are valence electrons?In Chemistry, valence electrons can be defined as the number of electrons that are present in the outermost shell of an atom of a specific chemical element.
Additionally, valence electrons are used to determine whether an atom or group of chemical elements that are found on a periodic table can chemically bond with others.
What are noble gases?In Chemistry, noble gases are chemical elements with eight valence electrons and as such have a full octet. Also, some examples of noble gases are argon, neon, etc.
In conclusion, all noble gases that are found in group 8A of the periodic table have a np6 electron configuration in the outer shell.
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