5.P.2.3

Front

What type of change occurs when rust forms on metal?

Back

Chemical change.

Front

What is an example of a change that results in a new substance being formed?

Back

A metal can rust.

Front

What must occur for rust to form on iron?

Back

A chemical change must occur when iron combines with water and oxygen.

Front

Why are ashes from a log evidence of a chemical change?

Back

The ashes cannot be put back together to create a log again.

Front

What describes the change to a bike that is covered in rust?

Back

It was a chemical change, because rust is a new substance on the metal.

Front

Define a chemical change.

Back

A process where one or more substances are transformed into new substances with different properties.

Front

What are the signs of a chemical change?

Back

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

Front

What is rust?

Back

Rust is a reddish-brown oxide formed by the reaction of iron and oxygen in the presence of moisture.

Front

How can you prevent rust from forming on metal?

Back

By applying protective coatings, keeping it dry, and using rust-resistant materials.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change does.