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Chemistry Final Exam Review
Test Description: Chemistry Final Exam Review
Instructions: Answer all questions to get your test result.
1) Ballons filled with helium gas are taken outside on a hot, sunny day and tied to a fence. Over a period of a few hours, the balloon will
A
Shrivel in size and deflate fully
B
Shrink in size and deflate
C
Increase in size and possibly burst.
D
Stay the same in size
2) Charles’s Law states that if a given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. This law explains why
A
a gas-filled balloon expands when it is heated.
B
solids require heat in order to change into gases
C
the pressure of a gas increases when volume decreases.
D
some gases only react with each other at high temperatures.
3) A student heated a 10g sample of a compound in an open container. A chemical reaction occurred. The mass of the sample was measured again and found to be less than before.
A
The heat caused the compound to become less dense.
B
Some of the lighter atoms were converted to energy.
C
One of the reaction products was a gas.
D
The reaction gave off more heat than was added.
4) Many laboratory preparations of solutions call for stirring the solvent while adding the solute. Which of the following is always an effect of this procedure?
A
It decreases the solubility of the solute
B
It brings the solute and solvent rapidly into contact.
C
It produces a double displacement reaction
D
It decreases the reactivity of the solute.
5) A large log of wood will burn more slowly than the same log chopped into smaller pieces. What is the best explanation for this observation?
A
The large log cannot absorb enough oxygen due to its size.
B
The large log cannot absorb enough energy due to its size.
C
The surface area of th original large log is smaller
D
The surface area of the chopped log is smaller
6) Which of these describes an exothermic chemical reaction?
A
A reaction that requires a catalyst to change the temperature.
B
A reaction in which the energy is released and the surrounding temperature increases.
C
A reaction that absorbs heat while the temperature remains the same
D
A reaction in which the energy is absorbed and the surrounding temperature decreases.
7) A gas in a sealed cylinder is heated. Which of the following does not increase as the gas is heated?
A
The average speed of the gas molecules.
B
The average distance between the gas molecules.
C
The average kinetic energy of the gas molecules.
D
The average number of gas molecules hitting the cylinder walls per second.
8) The pressure of a gas inside a closed, rigid container will increase when the gas temperature increases. The pressure of the gas increases because the
A
gas molecules bond together to form more massive molecules.
B
container expands in size when heated.
C
rate of collisions between gas molecules and the container increases.
D
density of the gas increases.
9) Which of the following observations about a certain pure solid would indicate most strongly that the solid is ionic?
A
It is composed of small white crystals.
B
Its water solution is a good conductor of electricity.
C
It has a high melting point.
D
It has a density greater than 1.0 gram/cc.
10) Melting can be defined as a
A
phase change of solid to liquid.
B
chemical change.
C
ubstance undergoing sublimation.
D
change from solid to gas only in the presence of a high temperature.
*select an answer for all questions
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