Watch For Qualifiers
The words best and least are examples of qualifiers. If a question contains a qualifier, more than one answer will contain correct information. However, only one answer will be complete and correct for the question asked. Look at the question below. Eliminate any answers that are clearly incorrect. Then choose the remaining answer that offers the best explanation for the question asked.
Choose the best explanation for why one particle in a gas does not affect other particles in a gas unless the particles collide.
Particles in a gas are constantly moving.
All the particles in a gas have the same kinetic energy.
There are no forces of attraction among particles in a gas.
There are billions of particles in a small sample of a gas.
Particles in a gas are relatively far apart.
(Answer: E)
Choose the letter that best answers the question or completes the statement.
A material can be classified as a liquid if
it has a definite shape and a definite volume.
it has a definite shape and a variable volume.
it has a variable shape and a definite volume.
it has a variable shape and a variable volume.
its particles vibrate around fixed locations.
Which statement best explains what must take place for water to boil?
The water releases energy to its surroundings.
Bubbles rise to the surface of the water.
The vapor pressure of the water becomes equal to atmospheric pressure.
Molecules at the surface of the water overcome the attractions of neighboring molecules.
The temperature of the water increases.
Condensation is the phase change in which a substance changes from
a solid to a gas.
a solid to a liquid.
a liquid to a solid.
a liquid to a gas.
a gas to a liquid.
Which of these statements about an enclosed gas is true? (Assume all quantities are constant except the two variables described in each statement.)
Raising the temperature of a gas will increase its pressure.
Increasing the volume of a gas will increase its pressure.
Reducing the number of particles of a gas will increase its pressure.
The volume of a gas is inversely proportional to its temperature in kelvins.
The volume of a gas is directly proportional to its pressure.
Use the illustration to answer Question 5. Assume that the number of particles of gas in container A equals the number of particles of gas in container B.
If the temperature is constant, the pressure in container B is
one half the pressure in container A.
twice the pressure in container A.
equal to the pressure in container A.
five times the pressure in container A.
one fifth the pressure in container A.
During an endothermic phase change,
the temperature of a substance rises.
the temperature of a substance decreases.
energy is transferred from a substance to its surroundings.
a substance absorbs energy from its surroundings.
there is no transfer of energy.