Chemical Changes

Front

What is a chemical change?

Back

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

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change, as it transforms into ash and smoke.

Front

What is evidence that a chemical change has occurred?

Back

Evidence includes the formation of a new substance, color change, gas production, or temperature change.

Front

Is melting ice a chemical change? Why or why not?

Back

No, melting ice is a physical change because it does not create a new substance.

Front

What happens when sodium and chlorine react?

Back

They combine to form sodium chloride (table salt), which is a new substance.

Front

What is the role of vinegar in a chemical reaction with baking soda?

Back

Vinegar acts as an acid that reacts with baking soda (a base) to produce carbon dioxide gas.

Front

What is a phase change?

Back

A phase change is a transition of matter from one state to another, such as solid to liquid.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.