CHEMISTRY HIGH SCHOOL

What does the atomic mass describe?a. The mass of the protons in the atom
b. The mass of the nucleus of the atom
c. The mass of the neutrons in the atom
d. The mass of the electrons in the atom

Answers

Answer 1
Answer: B., the mass of the nucleus of the atom.
Both the protons and the neutrons are inside the nucleus. The atomic number of an atom is the number of protons, and if you subtract the atomic number from the atomic mass you can find the number of neutrons an atom has. 
So, the mass of the protons plus the mass of the neutrons, which are both inside the nucleus, equals the atomic mass. 

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In Experiment 1, the density of pure ethanol was found to be:Question 1 options:less than 0.793 g/mL.0.793 g/mL.0.999 g/mL.greater than 0.999 g/mL.

Answers

It is 21 due to math a marica

The method used in this experiment is sometimes called the vapor density method. The ideal gas equation can be rearranged to solve for the density of a vapor . Which type or types of measurement is not needed to calculate the density of a gas?

Answers

The correct answer for the question that is being presented above is this one: "B) Temperature."
Here are the following choices:

A) all of these measurements are needed

B) Temperature

C) Molar Mass

D) Pressure

E) Mass

How can a redox reaction be used as a source of electrical energy?

Answers

A redox reaction be used as a source of electrical energy only when two half-reactions are physically separated. The electrons that are released at the anode flow through the wire, producing an electric current. Galvanic cells therefore transform chemical energy into electrical energy that can then be used to do work.

Explanation:

Electrical energy is the energy produced due to flow of electrons.

Whereas a reaction in which oxidation and reduction reaction takes place is known as a redox reaction. Basically, there is exchange of electrons that take place in a redox reaction.

For example, H_(2) + F_(2) \rightarrow 2HF

Oxidation half reaction: H_(2) \rightarrow 2H^(+) + 2e^(-)

Reduction half reaction: F_(2) + 2e^(-) \rightarrow 2F^(-)

Hence, this flow of electrons acts as a source of electrical energy.

How does the law of conservation of matter apply to chemical equations

Answers

Since the law of conservation of matter says that no matter can be created or destroyed, chemical equations must have the same amount of matter after the reaction as there was before, making them balanced.

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. If the can is warmed up on a hot plate, what happens to the atoms?

Answers

Explanation:

Since atoms of solid aluminium can are closer to each other, therefore, when heat is supplied then transfer of energy in the form of heat will be faster.

As a result, when can is warmed up then atoms of solid aluminium can will start to vibrate more because heat will decrease the force of attraction between the molecules.

Thus, atoms will start to move away from each other and hence, they will vibrate more.

Answer:

the atoms will vibrate more.

Consider three gases: Ar, SF6, and Cl2. If 50.0 grams of these gases are placed in each of three identical containers, which container will have the highest pressure? The volume and temperature of all three containers are the same.

Answers

The ideal gas law:
pV=nRT \Rightarrow p=(nRT)/(V)
p - pressure, n - number of moles, R - the gas constant, T - temperature, V - volume

The volume and temperature of all three containers are the same, so the pressure depends on the number of moles. The greater the number of moles, the higher the pressure.
The mass of gases is 50 g.

Ar \nM \approx 39.948 \ (g)/(mol) \nn=(50 \ g)/(39.948 \ (g)/(mol)) \approx 1.25 \ mol \n \nSF_6 \nM \approx 146.06 \ (g)/(mol) \nn=(50 \ g)/(146.06 \ (g)/(mol)) \approx 0.34 \ mol \n \nCl_2 \nM=70.9 \ (g)/(mol) \nn=(50 \ g)/(70.9 \ (g)/(mol)) \approx 0.71 \ mol

The greatest number of moles is in the container with Ar, so there is the highest pressure.
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