Chemical Reactions

Front

What is a physical change?

Back

A physical change is when objects or substances undergo a change that does not change their chemical composition.

Front

What is a chemical change?

Back

In a chemical change, a substance changes into a different substance.

Front

What is reactivity in terms of chemical properties?

Back

Reactivity is a measure of how easily a substance combines with other substances to produce a new substance.

Front

Which of the following is a compound: Co, O2, C, CO2?

Back

CO2 is a compound.

Front

What happens to a candle placed under a jar?

Back

The candle goes out as it uses up the oxygen and releases carbon dioxide.

Front

Define a chemical reaction.

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is a reactant?

Back

A reactant is a substance that takes part in and undergoes change during a reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.