Understanding State Changes

What happens during the process of melting?

• A gas turns into a liquid

• A solid turns into a liquid

• A liquid turns into a gas

• A solid turns into a gas

Which of these is NOT an example of a state change?

• Ice cream melting on a hot day

• Water boiling in a pot

• A wooden spoon breaking in half

• Water freezing into ice cubes

What's the main difference between evaporation and boiling?

• Evaporation happens at any temperature, boiling only at high temperatures

• Evaporation happens at the surface, boiling throughout the liquid

• Evaporation is faster than boiling

• Evaporation only happens to water, boiling can happen to any liquid

Why might coconut oil be liquid in a warm kitchen but solid in a cold fridge?

• Coconut oil changes color with temperature

• The fridge changes the chemical structure of coconut oil

• Coconut oil has a melting point near room temperature

• Coconut oil absorbs moisture in the fridge

Which material would likely be the best conductor of heat?

• Plastic

• Wood

• Rubber

• Metal

In the process of photosynthesis, what do plants produce?

• Carbon dioxide and water

• Oxygen and glucose

• Sunlight and heat

• Soil and minerals

Which of these changes is reversible?

• Burning a piece of paper

• Baking a cake

• Melting an ice cube

• Frying an egg

What type of change occurs when wood is burned?

• Reversible physical change

• Irreversible physical change

• Reversible chemical change

• Irreversible chemical change

Which of these is an example of an insulator?

• Copper wire

• Aluminum foil

• Styrofoam cup

• Silver spoon

What happens during the process of freezing?

• A gas turns into a liquid

• A solid turns into a liquid

• A liquid turns into a gas

• A liquid turns into a solid