Cracking the SAT Chemistry Subject Test

.

(B)         average speed   of  gas molecules

It’s the speed at which gas molecules are moving around in a tank or
container—it has to do with how much energy they have. It goes up with
higher temperature and down with lower temperature.

(C)         molecular   weight  of  gas molecules

It’s the weight (expressed in amu) of a gas molecule.

(D)         volume  of  gas sample

It’s the space the gas sample takes up—equal to the size of the container.

(E)         volatility

It has to do with how easily a liquid below its boiling point evaporates
when it’s sitting around.

Now look at each of the following questions:

Questions   1–4 refer   to  the following.

        1.  Is  always  increased   by  the addition    of  thermal energy  to  a   sample

of gas in a closed container
2. Can be related to the pressure of a gas sample by the ideal gas law
3. Property associated with vapor pressure
4. Depends on the formula of a gas but not its temperature

Read the questions carefully, one by one, and compare them to the answer
choices that you’ve put into your own words.

1. 
   

        Hopefully   you realize that    “thermal    energy” means   heat.   Now,    which   of

   
   

   the answer choices (stated in your own words) has to do with a factor that’s