Chemistry Final Exam Review: Question Preview (ID: 6090)

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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) Increase in size and possibly burst.
b) Shrink in size and deflate
c) Stay the same in size
d) Shrivel in size and deflate fully

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) some gases only react with each other at high temperatures.
d) the pressure of a gas increases when volume decreases.

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) One of the reaction products was a gas.
b) The reaction gave off more heat than was added.
c) Some of the lighter atoms were converted to energy.
d) The heat caused the compound to become less dense.

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 brings the solute and solvent rapidly into contact.
b) It decreases the solubility of the solute
c) It produces a double displacement reaction
d) It decreases the reactivity of the solute.

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 surface area of the chopped log is smaller
b) The surface area of th original large log is smaller
c) The large log cannot absorb enough energy due to its size.
d) The large log cannot absorb enough oxygen due to its size.

Which of these describes an exothermic chemical reaction?
a) A reaction in which the energy is released and the surrounding temperature increases.
b) A reaction in which the energy is absorbed and the surrounding temperature decreases.
c) A reaction that requires a catalyst to change the temperature.
d) A reaction that absorbs heat while the temperature remains the same

A gas in a sealed cylinder is heated. Which of the following does not increase as the gas is heated?
a) The average distance between the gas molecules.
b) The average number of gas molecules hitting the cylinder walls per second.
c) The average kinetic energy of the gas molecules.
d) The average speed of the gas molecules.

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) rate of collisions between gas molecules and the container increases.
b) density of the gas increases.
c) container expands in size when heated.
d) gas molecules bond together to form more massive molecules.

Which of the following observations about a certain pure solid would indicate most strongly that the solid is ionic?
a) Its water solution is a good conductor of electricity.
b) It has a density greater than 1.0 gram/cc.
c) It has a high melting point.
d) It is composed of small white crystals.

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.

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