Chemistry

Page
2

None of the above

Slide 14

Ice cubes float in a glass of water because:

a.the ice is losing mass through the melting process.

b.the colder ice is more dense.

c.liquid water is less dense than ice cubes.

d.the molecules of ice are arranged in an orderly way so that there is an unusually large amount of empty space in the ice cubes.

e.None of the above

Slide 15

A hot air balloon rises because

molecules become lighter when heated.

molecules move faster and farther apart when heated.

molecules are less attracted by gravity when heated.

molecules become charged and repel each other when heated.

Slide 16

The solid, liquid, and gaseous states of water differ from each other in

the mass of the individual atoms.

the size of the individual atoms.

the net electrical charge of the individual molecules.

the average speed of movement of the individual molecules.

Slide 17

The molecules in a test tube filled with cold water move more slowly than the molecules in a large tank of warm water. What is responsible for this difference in molecule speed?

pressure

volume

weight

heat

Slide 18

Heat can cause ice to change to liquid water by

filling the spaces between molecules.

causing molecules to move faster and farther apart.

increasing the distance between electrons within molecules.

increasing the attraction between molecules

Slide 19

If you saw an ice cube sink after it was placed in what you thought was a glass of water, which question should you probably ask?

What kind of liquid is in the glass?

Will the ice melt slower or quicker?

How fast did the ice cube sink?

How soon would the ice cube start to float?

Slide 20

What will happen if you mix vinegar and baking soda?

It will explode.

Nothing will happen.

It will bubble up rapidly.

It will turn bright red.

Slide 21

Which is a metric unit for density?

g/cm

cm/g

g/cm3

cm3/g

Slide 22

When a gas forms a liquid, which process is taking place?

freezing

condensation

boiling

evaporation

Slide 23

Which unit correctly describes density?