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# Mini-Quiz: Factors Affecting Density of Matter

by Ron Kurtus (revised 5 April 2014)

Take this Mini-Quiz to check your understanding of the lesson material.

1. If Uranium atoms have greater mass than Gold atoms, why does Gold have a greater density?

Gold is more expensive than Uranium and thus is more dense

There are more Gold atoms in a given volume than there are Uranium atoms

Uranium actually has a greater density than Gold

2. Why is the density of air in a balloon greater than the density of air outside the balloon?

Because it is under pressure and compressed

The density of air is the same everywhere

Because it is made up of Helium

3. What happens to the density of a piece of iron when it is melted?

The density increases because the iron atoms get heavier with heat

The density remains the same because heat does not affect iron

The density decreases when the iron changes its state

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

Think logically

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