1. Word Equations EASIER HARDER
EXT – Can you write a symbol equation for the reaction between hydrogen (H2) and oxygen (O2) to form water?
EASIER
HARDER

2. Easier 1) oxygen + magnesium  magnesium oxide
2) sulfuric acid + zinc  zinc sulfate + hydrogen
3) hydrogen + oxygen  water
4) nitric acid + lithium hydroxide  lithium nitrate + water
5) phosphoric acid + copper carbonate  copper phosphate + water + carbon dioxide
6) calcium carbonate  calcium oxide + carbon dioxide

3. Harder
1) methane + oxygen  carbon dioxide + water 2) lead nitrate + potassium iodide  lead iodide + potassium nitrate 3) nitrogen + oxygen  nitrogen dioxide 4) hydrochloric acid + sodium hydroxide  sodium chloride + water 5) magnesium + hydrochloric acid  magnesium chloride+ hydrogen 6) magnesium+ oxygen  magnesium oxide

4. No HWK!
Abdi (Bonita)

5. Learning Objectives
TWWL – about mass conservation – Describe conservation of mass in physical and chemical changes – Calculate masses of reactants and products – Write a hypothesis for conservation of mass investigation

6. No atoms are ever created or destroyed in a chemical reaction!
Equations
No atoms are ever created or destroyed in a chemical reaction!

7. methane + oxygen  carbon dioxide + water
What do you notice?
methane + oxygen  carbon dioxide + water

8. What do you notice?
C =
H =
O =
C =
H =
O =

9. What do you notice?
C = 1
H = 4
O = 4
C =
H =
O =

10. What do you notice?
C = 1
H = 4
O = 4
C = 1
H = 4
O = 4

11. Complete the conservation of mass worksheet!
EXT – Are each of the different things shown in equation 1 elements, compounds or molecules? Explain why.
Complete the conservation of mass worksheet!

12. Conservation of Mass

13. Conservation of Mass
chemical

14. Conservation of Mass
chemical
created

15. Conservation of Mass
chemical
created
atoms

16. Conservation of Mass
chemical
created
atoms
rearranged

17. Conservation of Mass
chemical
created
atoms
rearranged
products

18. Conservation of Mass
chemical
created
atoms
rearranged
products
type

19. Conservation of Mass chemical created rearranged atoms products type
equation

20. Which one is correct? 1 2 3

21. Which one is correct? 1 2 3

22. Which one is correct? 2 Because it has the same number
of each type of atom on both sides of the
equation.

23. Conservation of Mass
Can be demo or class practical

24. Conservation of Mass Complete the conservation of mass practical!
EXT – Bullet point a method for the experiment!
Complete the conservation of mass practical!

25. EXT – Bullet point a method for the experiment!
Conservation of Mass
EXT – Bullet point a method for the experiment!

26. Marking Points HYPOTHESIS AND PREDICTION Make a simple prediction
Use common sense or previous experience to support your prediction
Use basic scientific knowledge to explain your prediction
Use detailed scientific knowledge to explain your prediction
Use detailed scientific knowledge to explain your prediction and make a quantitative prediction
Explain your quantitative prediction including a sketch graph
HYPOTHESIS AND PREDICTION
DISPLAY TO PUPILS so they can see success criteria

27. Talk for 30 seconds!
End