Unit 2 Review

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products).

Front

What happens to molecules as temperature increases?

Back

Molecules move faster as temperature increases.

Front

What is thermal energy?

Back

The total energy of all the particles in an object, related to temperature.

Front

What is the difference between reactants and products in a chemical reaction?

Back

Reactants are the starting substances that undergo change, while products are the new substances formed.

Front

What is table salt chemically known as?

Back

Sodium chloride (NaCl).

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is the significance of the B-C and D-E segments in a temperature graph?

Back

These segments indicate periods where the temperature remains constant during phase changes.

Front

What is the best scientific question to ask after observing a chemical change?

Back

Did a chemical change occur?

Front

What is the state of matter of sodium at room temperature?

Back

Sodium is a solid at room temperature.