1. Intermediate 1 Unit 1b & c Reactions & Bonding 123 4567 89 10 111213 14 15 22 23242526 27 161718192021

2. What is always formed during a chemical reaction? A new substance

3. Give an example of a sign that a chemical reaction is taking place. Colour change, bubbling and fizzing, a solid forming, an energy change

4. What is precipitation? A solid being formed when two solutions react together.

5. Give an example of an everyday chemical reaction. Rusting, petrol burning, frying an egg.

6. How does increasing the temperature affect the speed of a reaction? It speeds it up

7. Do larger or smaller particles speed up a reaction? Smaller particles?

8. What effect does decreasing the concentration have on the speed of a reaction? It slows it down

9. What is a catalyst? A substance which speeds up a chemical reaction

10. What mass of a catalyst would be left at the end of a reaction if 1g was used. The same - 1g

11. What is an enzyme? A catalyst which works on living things - a biological catalyst

12. Carbon dioxide and water are produced when methane burns in oxygen. Write a word equation for this reaction. Methane + oxygen carbon dioxide + water

13. Water and sodium chloride are formed when hydrochloric acid reacts with sodium hydroxide. Write a word equation for the reaction. Hydrochloric acid + sodium sodium + water hydroxide chloride

14. What is an element made up of? Atoms

15. What is the number given to each element called? Atomic number

16. Are the bonds which hold the atoms together in a molecule strong or weak? Strong

17. What is an element? A substance made up of identical atoms.

18. What is a molecule? A group of atoms joined together.

19. Are the bonds between molecules strong or weak? Weak

20. Is the bond indicated strong or weak? Strong bond

21. Is the bond indicated strong or weak? Weak bond

22. What charge can an ion have? Positive(+) or negative (-)

23. What are these type of particles called? Ions +-+- +-+-

24. Are the bonds between ions strong or weak? Strong

25. Write the formula for the following molecule. C3H8OC3H8O CCCOH HHH H HHH

26. Write the formula for sulphur trioxide. SO 3

27. Write the formula for carbon monoxide. CO

28. Write the formula for nitrogen dioxide NO 2

29. Intermediate 1 Unit 1b & c 123 4567 89 10 111213 14 15 22 23242526 27 161718192021