Year 8 Science · Unit 3 · Lesson 1
Foundation Worksheet
Learning Goals
Fill the gap
Choose the correct word from the word bank to complete each sentence. Two words will not be used.
Everything around us is made of , which is anything that has mass and takes up space. A is any process that makes a material look or behave differently than before. When ice melts into water, it is a change because no new is formed. Burning wood is a change because ash and gases are produced that are completely different from the original wood. Most physical changes are — you can get the original material back.
True or False? Fix the false ones
Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.
Melting ice is a chemical change because the solid turns into a liquid.
Correct it:
Chemical changes always form at least one new substance with different properties.
Correct it:
All chemical changes can be reversed by simply cooling or heating the product.
Correct it:
Burning a marshmallow over a campfire is a chemical change because new substances — carbon, water vapour and other compounds — are formed.
Correct it:
1. Give one example of a physical change and one example of a chemical change that you might observe in a kitchen. Explain how you know which is which.
2. Why is reversibility a useful but not always reliable way to tell physical and chemical changes apart? Give an example to support your answer.
Wrap Up
In one sentence, what was the main idea of this lesson?