Changes of State

What is the process called when a solid changes directly into a gas without becoming a liquid first?

• Evaporation
• Condensation
• Sublimation
• Melting

Which of the following is an example of a reversible change?

• Burning a piece of paper
• Melting an ice cube
• Baking a cake
• Rusting of iron

What happens to the particles of a substance when it changes from a solid to a liquid?

• They move further apart
• They vibrate in fixed positions
• They gain energy and move more freely
• They lose energy and become tightly packed

Which of the following is an example of a non-reversible change?

• Freezing water to make ice cubes
• Boiling water to make steam
• Melting chocolate to make a chocolate bar
• Heating oil to make it less viscous

What is the process called when a gas changes directly into a solid without becoming a liquid first?

• Evaporation
• Condensation
• Sublimation
• Melting

What happens to the particles of a substance when it changes from a liquid to a solid?

• They move further apart
• They vibrate in fixed positions
• They gain energy and move more freely
• They lose energy and become tightly packed

Which of the following is an example of a reversible change?

• Burning a piece of wood
• Boiling water to make steam
• Mixing vinegar and baking soda to produce carbon dioxide
• Decaying of food

What happens to the particles of a substance when it changes from a liquid to a gas?

• They move further apart
• They vibrate in fixed positions
• They gain energy and move more freely
• They lose energy and become tightly packed

Which of the following is an example of a non-reversible change?

• Boiling water to make steam
• Condensing steam to make water
• Melting ice to make water
• Mixing salt and water

What is the process called when a solid changes directly into a gas without becoming a liquid first?

• Evaporation
• Condensation
• Sublimation
• Melting