Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process that results in the formation of one or more new substances with different properties from the original substances.

Front

What is a physical change?

Back

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

Front

What is an endothermic process?

Back

An endothermic process is a reaction or change that absorbs energy from its surroundings, usually in the form of heat.

Front

What is an exothermic process?

Back

An exothermic process is a reaction or change that releases energy to its surroundings, usually in the form of heat.

Front

Give an example of a chemical change.

Back

Examples include rusting of iron, burning wood, or baking bread.

Front

Give an example of a physical change.

Back

Examples include melting ice, cutting paper, or dissolving sugar in water.

Front

What indicates a chemical change has occurred?

Back

Indicators include color change, formation of a precipitate, formation of gas/bubbles, and temperature change.

Front

What does NOT indicate a chemical change?

Back

A change in the state of matter (e.g., solid to liquid) does not necessarily indicate a chemical change.

Front

What is combustion?

Back

Combustion is a chemical reaction that occurs when a substance reacts rapidly with oxygen, producing heat and light.

Front

What is photosynthesis?

Back

Photosynthesis is a chemical process used by plants to convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.