Exploring Matter and Energy

What are the three main states of matter?

• plasma, vapor, foam

• gas, liquid, crystal

• solid, liquid, gas

• solid, liquid, plasma

Which state of matter has a definite shape and volume?

• Gas

• Liquid

• Plasma

• Solid

What happens to the particles in a solid when it melts?

• The particles in a solid lose energy and become more compact when it melts.

• The particles in a solid remain stationary and unchanged when it melts.

• The particles in a solid evaporate completely when it melts.

• The particles in a solid gain energy and move more freely when it melts.

Define a physical change and give an example.

• Boiling water is a chemical change.

• Melting ice is an example of a physical change.

• Dissolving sugar in water is a chemical change.

• Rust forming on iron is a physical change.

What is a chemical change? Provide an example.

• Rusting of iron is an example of a chemical change.

• Melting of ice is a chemical change.

• Dissolving sugar in water is a chemical change.

• Boiling water causes a chemical change.

How does energy transfer occur during a phase change?

• Energy transfer during a phase change only occurs at constant pressure.

• Phase changes do not involve any energy transfer.

• Energy transfer during a phase change occurs as heat is absorbed or released without changing temperature.

• Temperature changes are always associated with phase changes.

What is the process called when a liquid turns into a gas?

• Evaporation or Boiling

• Freezing

• Sublimation

• Condensation

What is the term for the change from gas to liquid?

• Sublimation

• Evaporation

• Condensation

• Precipitation

Explain the law of conservation of energy.

• Energy is always lost in transformations.

• Energy cannot be created or destroyed, only transformed.

• Energy can be created from nothing.

• Energy can be destroyed under certain conditions.

What happens to energy during a physical change?

• Energy is absorbed or released, but total energy is conserved.

• Energy is created during a physical change.

• Energy is destroyed in a physical change.

• Energy remains constant and does not change.