Key stage 3 Science Exercise
1. Ceramics are hard but very __________ .
2. Ceramics are not _________ .
3. Composites are made of _______ different types of materials.
4. The pH scale measures the strength of acids and ________ .
5. The pH scale ranges from 0 to _______ .
6. A pH less than _______ is an acid.
7. A pH of _________ is neutral.
8. A pH greater than _______ is an alkali.
9. During photosyntheses carbon dioxide is removed from the air by _______ .
10. Carbon is passed on to ________, when the plants are eaten by animals.
11. Earth's atmosphere contains different _______ .
12. Earth's atmosphere contains nitrogen, oxygen, argon and _______ .
13. There are _____ types of energy stores.
14. There are ________ methods of transferring energy.
15. Energy can be transferred from one store to another by heating, radiation, electrically and ________.
16. Renewable energy resources are wind, water, solar, and ________ energy.
17. Non-renewable energy resources are fossil fuels and ________ energy.
18. The number of unit of electricity used in household is measured by ________ .
19. Non-renewable energy resources are fossil fuels and ________ energy.
20. _______ shows us the amount of energy in a food.
Answers:1. brittle 2. flexible 3. two or more 4. alkalis 5. 14 6. 7 7. 7 8. 7 9. green plants 10. animals 11.gases 12. carbon dioxide 13. 7 14. 4 15. mechanically 16. biomass 17. nuclear 18. electricity meters 19. nuclear 20. Food label