WorksheetsHow the World Works
Total questions: 20
Worksheet time: 29mins
1. Which of the following is an example of a physical change?
Burning wood
Baking a cake
Melting ice
Rusting iron
2. What is a sign of a chemical change?
A change in state
A new substance is formed
A change in size
Dissolving in water
3. Which of these changes can be reversed?
Freezing water
Baking bread
Burning paper
Cooking an egg
4. What is an example of a harmful chemical change?
Rusting of metal on bridges
Melting of ice in hot weather
Boiling water for cooking
Stretching a rubber band
5. Which of the following chemical changes has a positive impact on life?
Corrosion of iron
Acid rain forming in the atmosphere
Burning fossil fuels
Formation of compost from organic waste
6. Why is recycling plastic bottles an example of a physical change?
The plastic burns and forms new substances
The shape of the plastic is changed without altering its chemical structure
The plastic reacts with air to form new materials
7. What property of water changes when it freezes?
Chemical composition
Flammability
Density
Toxicity
8. What is climate change?
A change in weather for one day
A long-term change in the Earth’s temperature and weather patterns
A holiday about the environment
A change in the amount of rain for a week
9. Which gas is one of the main causes of global warming?
Oxygen
Nitrogen
Carbon dioxide
Helium
10.What do greenhouse gases do?
Make plants grow faster
Trap heat in the Earth’s atmosphere
Create more oxygen for us to breathe
Block sunlight from reaching the Earth
1. A change in which no new substance is formed is called a (a) change.
2. Burning wood produces __________ and __________ as new substances.
(a)
3. Trees help reduce climate change by absorbing (a) from the air.
4. Climate change can cause (a) to melt, which raises sea levels.
5. Harmful chemical changes like (a) can damage the environment and living organisms.
1. Boiling water is a chemical change because new substances are formed.
True
False
2. Cutting a piece of paper is a physical change.
True
False
3. The decomposition of food waste into compost is a chemical change.
True
False
4. Acid rain has no effect on plants or soil.
True
False
5. Physical changes are always reversible.
True
False
