D

Which of the diagrams best shows the arrangement of molecules in a solid? 

• A
• B
• C
• D

Which picture shows a liquid at room temperature?

• picture A
• picture B
• picture C
• picture D

The circles in the bottles represent the same particles of matter. Which pattern of particles represents a gas in a bottle?

• A
• B
• C
• D

Gallium is a metal that melts at about 30°C. If a person, whose body temperature is 37°C, held a cube of gallium for five minutes, what will most likely happen to the gallium?

• It will change to a gas.
• It will change to a liquid.
• It will become a solution.
• It will become a mixture.

What will happen if the lid is removed from a container that holds helium gas?

• The gas will expand and escape from the container. 
• The gas will slowly change back into a liquid.
• When light hits the gas, it will change colors.
• Gravity will keep the gas in the container.

When ice cream is left out of a freezer, the ice cream changes from a —

• solid to a gas
• gas to a liquid
• solid to a liquid
• liquid to a gas

The smallest part of matter that is identifiable as an element is the —

• atom 
• molecule
• cell
• compound

Oxygen, nitrogen, and carbon dioxide may be grouped together because at room temperature they are all a —

• solid
• liquid
• gas
• colloid

Which of these shows how frozen water changes as the temperature of the air increases?

• Gas → liquid → solid
• Solid → gas → liquid
• Liquid → gas → solid
• Solid → liquid → gas

Which of these will happen if the temperature of a metal pan is increased?

• The pan will begin to lose heat.
• The molecules of the pan will move faster. 
• The metal will change into another metal.
• The pan will contract.