expandable and compressible.
Changing the amount of a substance will not raise its
temperature (B). By remembering the formula for
density, (C), (d = m/v), we see that the density of a
substance will remain the same despite an increase or
decrease in the mass of a substance, if the volume is
changed in direct proportion to the change in mass. The
pressure, (D), exerted on a solid or liquid will remain
the same, regardless of the number of molecules of the
substance. The pressure of a gas in a closed container
will change with an increase or decrease in mass, but if
the volume of the container holding the gas is increased
or decreased as the mass changes, the pressure will not
change.
- C Kilograms are used to represent mass, and liters are used to
represent volume. Mass/volume = density, so (C) is correct.
- B If you remembered to associate temperature with average kinetic
energy, you knew that (B) was correct.
- T, F Divide and conquer! First, examine each statement separately, and
determine whether it’s true or false.
Is the first statement true? Yes, it is, although
camouflage might at first prevent you from realizing
that. But because
density =
simple algebra allows you to calculate mass, if you
know density and volume.
mass = (density)(volume)
Now look at statement II, and decide whether it’s true
