Answer:
3.11 is the pH of the solution
Explanation:
The ionised form of the acetic acid is the acetate ion. To solve this problem we need to solve H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer
pKa = -log Ka = 4.74
[A⁻] = Concentration of acetate ion = 0.002M * 2.3% = 4.6x10⁻⁵M
[HA] = Concentration of acetic acid = 0.002M *(100-2.3)% = 0.001954M
Replacing:
pH = 4.74 + log [4.6x10⁻⁵M] / [0.001954M]
pH = 3.11 is the pH of the solution
Multiple Choice: Encircle the letter of the correct answer.
1. Which type of matter has the molecules packed closer together?
a. Solid
b. Liquid
c. Gas
d. Plasma
2. Matter is made up of __________.
a. Molecules
b. Particles
c. Atom
d. All of them
3. Particles with more energy move ________ than particles with less
energy.
a. Slower and closer together
b. Slower and farther apart
c. Faster and farther apart
d. Faster and closer together
4. Which best describes the particles in a liquid?
a. More freely moving than a gas
b. More freely moving than a
solid
c. Less freely moving than a
solid
d. Completely unmoving
5. Which of the following statements describes a mass?
a. The force of attraction between two bodies.
b. The force of gravity exerts on a body of mass.
c. The amount of matter in an object.
d. The weight of the object from place to place.
6. Any sample of matter has mass and takes up space. The main reason
for this is because __________.
a. All matter is heavy
b. Matter can be a gas
c. Matter is made up of tiny particles that have mass and take up space
d. The Earth is made of matter
7. When a thermometer is heated, the red liquid inside the thermometer
moves up. This is mainly because __________.
a. The red liquid is thin.
b. The molecules of the liquid move faster and get a little further apart
c. Hot liquid is lighter
d. The glass of the thermometer gets hot
For question numbers 8-10,
8. To describe a liquid, you could say:
a. The particles of a liquid are not attracted to one another
b. The particles of a liquid are in motion
c. The particles of a liquid are not able to move past one another
d. A liquid has no mass but takes up space
9. To describe a solid, you could say:
a. The particles of a solid are not attracted to each other
b. The particles of a solid can move past one another
c. The particles of a solid vibrate but do not move past one another
d. A solid has mass but does not take up space
10. To describe a gas, you could say:
a. The particles are very attracted to each other
b. The particles are not very attracted to each other
c. The particles are close together like a liquid
d. The particles of a gas are closer apart than the particles in a liquid or
solid
Answer:
1. solid
2. all of them
3. Faster and farther apart
4. more freely moving than a solid
5. the amount of matter in an object
6. matter can be a gas.
7. the glass of the thermometer gets hot.
8. the particles of a liquid are unable to move past each other.
9. the particles of a solid vibrate but do not move past one another.
10. the particles are not attracted to one another.
what mixture is salt and water?
a.solutions
b.colloids
c.suspensions
How are you able to light a bunsen burner
Answer:
Lighting Bunsen Burner:
Explanation:
Close needle valve and collar. Open gas valve fully. Open needle valve 1/2 turn. Use the spark/lighter to light the flame.
Which of the following best describes the kinetic theory?
A. Energy is conserved when converted to another type of energy.
B. Atoms and molecules are always moving or vibrating.
C. Electron pairs move apart to form more stable molecules.
D. Atoms rearrange in molecules to form new compounds.
Answer:B
Explanation:
Atoms and molecules are always moving or vibrating. (just took the test)
Answer:
★ B. Atoms and molecules are always moving or vibrating.
Explanation:
Hope you have a great day :)
An average, how many eggs does a female release each
cycle?
Answer:
At birth, there are approximately 1 million eggs; and by the time of puberty, only about 300,000 remain. Of these, only 300 to 400 will be ovulated during a woman's reproductive lifetime. Fertility can drop as a woman ages due to decreasing number and quality of the remaining eggs.
Explanation:
Hope This Helps!!
Answer:
One egg per month usually .
Explanation:
This is the single egg that makes it through the whole ovulatory process
what is a flame,metion two types of flames
Answer:
A flame is defined as the gaseous part of the fire which is visible to us. A flame is created due to the high exothermic reaction.
Two types of flames based on the amount of oxygen available are:
Non-luminous or blue flame: In this type of flame the amount of oxygen is sufficiently large and it gives blue flame. For example: flame of Gas stove. Luminous flame: In this type of flame, the oxygen availability id not sufficient for the complete combustion and left unburnt carbon particles that forms yellow light flame. For example: kerosene lamp.The intensity of a sound wave increases as the wave spreads out from the source of the sound
Answer:
The more spread out their energy becomes
Which chemical equation correctly represents the reaction that takes place when nitrogen gas and hydrogen gas are formed as ammonia decomposes? (4 points) a N(g) + H3(g) → NH3(g) b 2N(g) + 3H2(g) → 2NH3(g) c 2NH3(g) → N2(g) + 2H3(g) d 2NH3(g) → N2(g) + 3H2(g)
Answer:
d. 2NH3(g)-N2(g)+3H2(g)Un camion que circula a 90 km hora frena uniformemente con una aceleracion de -5 metros por segundos al cuadrado
Answer:
no habla espanol
Explanation:
What volume of chlorine gas (Cl2), measured at STP, can be produced by the decomposition of 73.0g of hydrogen chloride gas (HCl), according to the balanced equation? (the other product is hydrogen gas (H2))
Answer:
Explanation:
2HCl = H₂ + Cl₂
2 mole 1 mole 1 mole
73 gram HCl = 73 / 36.5 = 2 mole of HCl
2 moles of HCl will produce 1 mole of chlorine gas .
At STP , one mole of chlorine gas has volume equal to 22.4 litre .
Use the following equation to answer the questions below.
CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)
1. What type of reaction is this? Why do you say it is this type of reaction? Support your claim with evidence. (2 points, 1 point valid type of reaction, 1 point valid evidence)
2. What is the mole ratio of methane to water in the reaction? (1 point correct mole ratio)
3. How many moles of water are produced from the reaction of 50.0g of methane (CH4)? Show your work (2 points, 1 point valid answer, 1 point valid work)
Answer:
1-Double replacement
Explanation:
2 SO2 + O2 + 2H2O ----> 2H2SO4 what reaction is this?
Answer: This type of reaction is a synthesis reaction.
Explanation: Reaction information:Sulfur Dioxide + Dioxygen + Water = Sulfuric Acid
If I balanced it, it would be 2SO2 + O2 + 2H2O → 2H2SO4
9. Which of the following is a chemical property of water at 4°C? its temperature its state its color
Name the following:
1. SF6
2. N2O4
3. Cl2O7
4. S2Cl2
Answer:
Solfuric Floride
Nitrodgen Oxide
Clorine oxide
Sulfur Cloride
Explanation:
IM A CHEMISTRY WIZ
What colour change would you notice with China rose indicator when you add it to soap water and vinegar?
explain nature
have a great day
Answer:
The phenomena of the physical world at together which includes plants, animals, the landscape, and other features and products of earth as opposed to humans or human creations
Where are fusion reactions found
Answer:
In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become a helium atom. Although nuclear fusion reactions require a lot of energy to get started, once they are going they produce enormous amounts of energy.
Explanation:
Given the reaction:
2KCIO3(s) - 2KCl(s) + 302(g)
What is the total number of moles of KCIO3(s) needed to
produce 6 moles of O2(g)?
Answer:
4 moles of potassium chlorate must be used to produce 6 moles of oxygen gas.
Explanation:
From the above reaction:
2KCIO3(s) - 2KCl(s) + 3O2(g)
where,
KCl = Potassium Chloride,
O2 = Oxygen
KClO3 = Potassium chlorate
To calculate the number of moles for KClO3
If 3 moles of O2 gives 2 moles of KClO3
then 6 moles of O2 gives 6/3 x 2 = 4 moles of KClO3.
Hence, 4 moles of KClO3 produces 6 moles of O2.
What is moles?Moles are "a unit of measurement for chemicals, just as meters are measurement units for length and grams are measurement units for mass".
What is Potassium Chloride?
Potassium Chloride is a "metal halide composed of potassium and chloride".
What is Oxygen?Oxygen is "an element with atomic symbol O, atomic number 8, and atomic weight 16".
What is Potassium Chlorate?Potassium chlorate is "an important potassium compound that can be used as an oxidizer, disinfectant, source of oxygen, and component in pyrotechnics and chemistry demonstrations".
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What is the molarity of a solution in which 35 mole of AgNO3 is dissolved in 5 L of solution?
Answer:
23
Explanation:
Answer:
0.118m
Explanation:
Which is element number 10?
Please Help!!
Answer:
Neon is a chemical element with the symbol Ne and atomic number 10. It is a noble gas.
Answer:
Neon is the element which is in serial number 10 in the periodic table.
Neon is one of the noble gases, i.e., they are stable (talking about NOBLE GASES)
what are the elements in the first period
Answer:
Explanation:
There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure.
Answer:
"Hydrogen and Helium". Hydrogen and Helium are the elements of the first period in the modern periodic table.
Explanation:
HEEELPPP!!
Explain the difference between ionic and covalent bonding using the following term(s)
A. Electronegativities
B. Types of atoms bonding
Answer:
Explanation:
Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
PLS ANSWER THIS FOR ME ILL GIVE BRAINLIEST
ok so pls watch episode 18 (Eureka Videos is the channel) and then answer all these
When molecules evaporate they are gaining enough _______ to break the forces of __________ holding them together. This might be compared to the popping of popcorn.
Why can't we see the vapour molecules that have escaped?.
How does increasing the heat affect the rate of molecules popping out into the vapour state?
The colder molecules get, the _________ they move
Given the following equation: 2C6H6 + 15O2 - 12CO2 + 6H2O
How many moles of O2 are needed to react with 4.0 moles of
C6H6?
A. 30 Moles
B. 12 moles
C. 4.0 moles
D. 24 moles
Answer: 30 moles
Explanation:
2C6H6 + 1502 -------> 12CO2 + 6H2O from reaction
2 mol 15 molgiven 4.0 mol
x molx = 4.0*15/2 = 30. mol
3. Among the pairs of organic compounds below. Which is
a. water, lubricating oil b. kerosene, liquefied perde
Answer:
A is the right answerA is the right answerA is the right answerA is the right answer
Explanation:
what does solubility mean?
Solubility means the ability of a solute to dissolve in solvent to form a solution.
What is solubility?Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a particular temperature.
The solute can be a solid, liquid or a gas.
The solubility of a solid or a liquid solute in a solvent is affected by the temperature, while the solubility of a gaseous solute is affected by both the temperature and the pressure of the gas.
Therefore, Solubility means the ability of a solute to dissolve in solvent to form a solution.
Learn more about Solubility, here:
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Aluminium can be manufactured from the electrolysis of a molten mixture of aluminium oxide and
cryolite. In this process, which electrode must be continually replaced
Answer:
The carbon anode
Explanation:
The carbon anode is continually replaced because it burns off as carbon IV oxide gas by reacting with the oxygen had produced at the anode.
need asap!
The boiling point of hydrogen sulfide is low. Explain why.
Sulfur is not nearly as electronegative as oxygen so that hydrogen sulfide is not nearly as polar as water. Because of this, comparatively weak intermolecular forces exist for H2S and the melting and boiling points are much lower than they are in water.
The boiling point of hydrogen sulfide is low because the oxygen atom was stronger electronegative than that of the Sulphur atom, water would be more polar than hydrogen sulphide.
What is polar molecule?If a molecule does have more positive charges on one end than negative charges on the other, an electrical pole has been created. This is how polar molecules are typically formed.
What is boiling point?
The temperature where a liquid's vapor pressure reaches the pressure around it as well as the liquid transforms into a vapor is known as the boiling point of a substance.
The boiling point of hydrogen sulfide is low because the oxygen atom was stronger electronegative than that of the Sulphur atom, water would be more polar than hydrogen sulphide. Additionally, hydrogen sulphide has a lesser melting point as well as boiling point than water due to poor intermolecular forces (dipole forces, Vander Waal's forces).
To know more about polar molecule and boiling point
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What is the most common oxidation number for group 3 on the periodic table?
Answer:
español
Un elemento del grupo 3 es un elemento situado dentro de la tabla periódica en el grupo 3. Los átomos de estos elementos tienen gran tendencia a oxidarse y son muy reactivos, predominando el estado de oxidación +3. Presentan propiedades muy similares al aluminio. Dan lugar a iones incoloros.
ingles
An element of group 3 is an element located within the periodic table in group 3. The atoms of these elements have a great tendency to oxidize and are very reactive, with the +3 oxidation state predominant. They have properties very similar to aluminum. They give rise to colorless ions.
Explanation:
ingles
Group -> 3
Group -> 3Period
Group -> 3Period4 21
Group -> 3Period4 21Sc
Group -> 3Period4 21Sc5 39
Group -> 3Period4 21Sc5 39Y
Group -> 3Period4 21Sc5 39Y6 57
Group -> 3Period4 21Sc5 39Y6 57The
Group -> 3Period4 21Sc5 39Y6 57The7 89
Group -> 3Period4 21Sc5 39Y6 57The7 89Ac
español
Grupo -> 3
Grupo -> 3Periodo
Grupo -> 3Periodo4 21
Grupo -> 3Periodo4 21Sc
Grupo -> 3Periodo4 21Sc5 39
Grupo -> 3Periodo4 21Sc5 39Y
Grupo -> 3Periodo4 21Sc5 39Y6 57
Grupo -> 3Periodo4 21Sc5 39Y6 57La
Grupo -> 3Periodo4 21Sc5 39Y6 57La7 89
Grupo -> 3Periodo4 21Sc5 39Y6 57La7 89Ac
What is the atomic number of an isotope with the following symbol:
20 F
Answer:9
Explanation:
F is Flourine on the periodic table; the atomic number of Flourine is 9
caution: when you say “20 F” your meaning is unclear. regardless of what you mean, though, the atomic number of F is 9
