P5 Science: Physical and Chemical Changes

• Things around us can be classified into pure substances and mixtures depending on their ...

• parts

• elements

• constituents

• materials

A pure substance is ...

• made up of only one substance

• made up of pure substances

• made up of two or more substances

• made up of 98% pure substance

Which of the following is not an example of a pure substance?

• sugar

• salt

• aluminum

• water

A chemical change results in the formation of (1) _____ which involves a (2) _____.

• Changes can happen when materials interact with _____, _____ or _____, or are mixed

Explain how a chemical change can be caused by heat (Use one example)

Explain how a chemical change can be caused by mixing (Use one example)

Explain the difference(s) between physical changes and chemical changes.

The changing of water into steam is an example of (1) _____ change, while the burning of charcoal is an example of (2) _____ change.

• physical, physical

• chemical, physical

• physical, chemical

• chemical, chemical

• When vinegar is added to baking soda, a gas is produced. (i) What causes the change, and (ii) Is it a physical or a chemical change?