chemie - reactions

Heat is released, causing temperature to rise

What happens in an exothermic reaction?

Heat is absorbed, leading to a temperature decrease.

What happens in an endothermic reaction?

Physical changes are reversible and do not form new substances.

How do physical changes differ from chemical changes?

Evidence includes color change, gas production, or temperature change.

What indicates a chemical reaction has occurred?

Substances that are present at the start of the reaction.

What are reactants in a chemical reaction?

Substances that are formed at the end of the reaction.

What are products in a chemical reaction?

A reaction involving burning in oxygen.

What is combustion?

The process of gaining oxygen during a reaction.

What is oxidation?

A single substance breaks down into simpler substances.

What occurs during decomposition?

It produces a metal oxide and carbon dioxide.

What is thermal decomposition of a metal carbonate?

Mass is neither lost nor gained in a chemical reaction.

What does the conservation of mass state?