Chemical Interactions - Unit Review

Front

What is the difference between cold air particles and hot air particles?

Back

Cold air particles are closer together, have less kinetic energy (KE), and move slower than hot air particles. They are not smaller than hot air particles.

Front

What is NOT a sign of a chemical change?

Back

A loss of transparency is NOT a sign of a chemical change.

Front

Which of the following is NOT evidence of a chemical reaction?

Back

Melting is NOT evidence of a chemical reaction.

Front

What does a balanced chemical equation represent?

Back

A balanced chemical equation shows that the number of atoms of each element is the same on both sides of the equation.

Front

In which direction does heat travel?

Back

Heat always travels from hot to cold objects.

Front

What is kinetic energy (KE)?

Back

Kinetic energy is the energy that an object possesses due to its motion.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is an example of a sign of a chemical reaction?

Back

An unexpected color change is an example of a sign of a chemical reaction.

Front

What is the definition of a new substance?

Back

A new substance is a material that has different properties and composition from the original substances after a chemical reaction.