Chapter 1 - Unit Test

Any sample of matter has mass and takes up space. The main reason for this is because:

• All matter is heavy

• Matter can be a gas

• Matter is made up of tiny particles that have mass and take up space

• The Earth is made of matter

Water drops stay together on wax paper and don’t break apart easily. This is mainly because:

• Water molecules are small

• Water molecules are in motion

• Water molecules are attracted to each other

• Water molecules are wet

When you bring two drops of water near each other and allow them to touch, they combine immediately and become one drop. This is mainly because:

• Water molecules are made of atoms

• Water molecules are attracted to each other

• Water molecules are magnetic

• Water is a liquid

If you put food coloring in room temperature water, the coloring spreads throughout the water. The water causes the color to spread mainly because:

• Water molecules are warm

• Water molecules are in motion

• Water is more dense than food coloring

• Food coloring molecules are small

Food coloring spreads out faster in hot water than in cold water. This is mainly because:

• The water molecules in hot water move more quickly

• The molecules in hot water are larger

• The food coloring molecules are small

• Hot water is less dense

When a thermometer is heated, the red liquid inside the thermometer moves up. This is mainly because:

• The red liquid is thin

• The molecules of the liquid move faster and get a little further apart

• Hot liquid is lighter

• The glass of the thermometer gets hot

When a thermometer is cooled, the red liquid inside the thermometer moves down. This is mainly because:

• Cold liquids sink

• The glass of the thermometer gets cold

• The molecules of the liquid move slower and get a little closer together

• The red liquid is thick

When you heat a sample of a solid, the particles that make up the solid:

• Get bigger

• Loose mass

• Move faster

• Slow down

When you heat a sample of a solid, the sample gets a little bigger. This is mainly because:

• The particles move faster and get a little further apart

• Heat helps the particles grow

• Heating the sample makes it lighter

• Heating helps the particles slide past each other

When you heat a sample of gas, what happens to the particles that make up the gas?

• The particles move faster

• The particles break apart

• The particles get smaller

• The particles become more dense