Physical and Chemical Changes 2.1

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

Front

Is rusting a chemical change?

Back

Yes, rusting is a chemical change because it involves the reaction of metal with oxygen to form rust.

Front

Is photosynthesis a chemical change?

Back

Yes, photosynthesis is a chemical change as it transforms carbon dioxide and water into glucose and oxygen.

Front

What happens during digestion?

Back

During digestion, food undergoes chemical changes to break down into smaller molecules that the body can absorb.

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

An example of a chemical change is burning wood, which produces ash and gases.

Front

How can you identify a chemical change?

Back

You can identify a chemical change by observing signs such as color change, gas production, or the formation of a precipitate.

Front

What is the role of a balance in measuring mass?

Back

A balance is used to measure the mass of an object, which is a physical change as it does not alter the object's composition.

Front

What is combustion?

Back

Combustion is a chemical change that occurs when a substance reacts with oxygen to produce heat and light.