Question

When do chemical changes occur? (3 situations)

Answer 1

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. Three situations in which chemical changes occur are when there is a change in color, when a gas is produced, or when a solid product called a precipitate is formed.

Step-by-step explanation:

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc.) is turned into a different substance with different properties. Chemical changes are frequently harder to reverse than physical changes.

There are three situations in which chemical changes occur:

1. When there is a change in color during a reaction. For example, when apple slices turn brown after being exposed to air.
2. When a gas is produced during a reaction. An example of this is the reaction between baking soda and vinegar, which produces carbon dioxide gas.
3. When a solid product called a precipitate is formed. This can happen when two clear solutions are mixed together and a solid substance is formed as a result.