JDES Physical and Chemical Changes

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. Examples include melting, freezing, and cutting.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and digestion.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is wood burning to produce ash and soot.

Front

What happens during a chemical reaction?

Back

During a chemical reaction, substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What is soot?

Back

Soot is a black powdery substance that is produced when organic matter, like wood, burns incompletely.

Front

How can you separate a mixture of corks and bolts?

Back

You can separate a mixture of corks and bolts by adding water, as corks will float while bolts will sink.

Front

What indicates a chemical reaction has occurred?

Back

Signs of a chemical reaction include color change, temperature change, gas production, and the formation of a precipitate.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a type of chemical reaction that absorbs heat from its surroundings, resulting in a temperature drop.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat, causing the temperature of the surroundings to increase.