Chemical Reactions vs Physical 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 is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition.

Front

Give an example of a chemical change.

Back

Making pancakes is an example of a chemical change because new substances are formed during cooking.

Front

Give an example of a physical change.

Back

Evaporating water from a puddle is an example of a physical change because the water changes from liquid to gas but remains H2O.

Front

What happens to water drops on grass during the day?

Back

Energy from the Sun heats the water and causes the drops to evaporate.

Front

Why are hard-boiled eggs a result of a chemical change?

Back

Hard-boiled eggs have different properties (smell, taste, color) before vs after cooking.

Front

Is sharpening a pencil a physical or chemical change?

Back

Sharpening a pencil is a physical change because it alters the shape but not the chemical composition.

Front

What is condensation?

Back

Condensation is the process where water vapor in the air cools and changes back into liquid water.

Front

What is evaporation?

Back

Evaporation is the process where liquid water turns into water vapor due to heat.

Front

What is an example of a physical change caused by temperature?

Back

Evaporating water from a puddle is a physical change caused by temperature.