1. M5 Reading & Vocabulary

2. Metals Periodic Table of the Elements noble gases halogen non-metals
metalloids

3. Metals around us
Al (aluminium)+C… 铝 W 钨
Fe (ferrum/
iron) 铁

4. K (potassium)
Na (sodium)
Ca (calcium)

5. Cu (copper)
Mg (magnesium)
Zn (zinc)

6. The best title The relationship: Uses & Reaction
Different metals have different uses, for example, steel is used
in cars, and iron is used in electrical equipment.
The best title
The Different Uses of Metals The Reaction of Metals The Reaction of Metals with Oxygen
The relationship: Uses & Reaction

7. Quick quiz: Mg、Al、Zn K、Ca、Na No, only partially. No, it doesn't.
1. Which metals react with the steam? 2. Which of the metals in the table reacts the most with oxygen and water? 3. Does iron react completely with water? 4. Does copper react with water? 5. What happens when you heat calcium in oxygen?
Mg、Al、Zn
K、Ca、Na
No, only partially.
No, it doesn't.
It burns to form an oxide called CaO.

8. oxide Metal Heated in oxygen an oxide= another substance+oxygen
Potassium
Sodium
Calcium
Magnesium
Aluminium
Zinc
Iron
Copper K
普通:4K+O2=2K2O
充足空气:K+O2=KO2 Na
普通:2Na+O2=Na2O
充足空气:2Na+O2=Na2O2
2Ca+O2==2CaO Ca
2Mg+O MgO
―――― 点燃 Mg Al
4Al+3O2=2Al2O3
oxide Zn
2Zn+O ZnO
―――― 点燃
3Fe+2O Fe3O4(reacts slowly)
―――― 点燃 Fe
2Cu+O2==2CuO(partial reaction) Cu
an oxide= another substance+oxygen

9. Reaction with water or steam
Metal
Reaction with water or steam
Potassium
Sodium
Calcium
Magnesium
Aluminium
Zinc
Iron
Copper K
2K+2H2O=2KOH+H2↑ Na
2Na+2H2O=2NaOH+H2↑ Ca
Ca+2H2O=Ca(OH)2+H2↑ Mg
Mg+H2O==MgO+H2↑ Al
2Al+3H2O==Al2O3+3H2↑ Zn
Zn+H2O==ZnO+H2↑
3Fe+4H2O==Fe3O4+4H2↑ Fe
No reaction Cu

10. Describe the reaction Example: K Na Ca Mg Al Zn Fe Cu
1. When Potassium is heated in oxygen, it burns to form an oxide called K2O or KO2. 2. When Zinc reacts with steam, it forms ZnO and gives off H2.
普通:4K+O2=2K2O
充足空气:K+O2=KO2
Zn+H2O==ZnO+H2↑
K Na Ca Mg Al Zn Fe Cu

11. Stages of a Scientific Experiment
raise the question
and the hypothesis
have an aim
use proper methods
do the experiment
observe the results
draw the conclusion
write experiment report

12. rust 3Fe+4H2O=Fe3O4+4H2↑ Step one: Set an Aim
To find out if iron rusts (a)in dry air;
(b) in air-free water; (c) in ordinary water.
rust
What do we need to do this experiment?

13. Prepare the Apparatus Step two: iron nails test tube holder test tubes
Bunsen burner
oil
cotton wool

14. (Starting experiment)
Step three:
Do the Experiment
Iron in dry air
Iron in
air-free water
Iron in ordinary water
Stage A
(Starting experiment)
Stage B
(1 week later)
Stage C
(Result)
1. oil layer
2. _______
3. nails
1. ________
2. nails
cotton wool
1. _______
2. nails
water
water
1. cotton
wool
2. _______
1. oil layer
2. water
3. nails
1. water
2. _______
water
nails
__________________
Iron doesn't
rust.
__________________
Iron doesn't
rust.
__________________
Iron rusts.

15. Draw a conclusion Describe the process Step four:
Iron rusts in ordinary water (with oxygen in it).
Experiment 1: in dry air
test tube, iron nails, cotton wool
Experiment 2: in air-free water
test tube, water, bunsen burner,
iron nails, oil
Experiment 3: in ordinary water
test tube, iron nails, water
Describe
the process

16. Read the passage again and think about the following Qs:
1. Why should we leave the tube for one week?
2. What is the Bunsen burner used for?
3. Why could the oil float?
4. What is oil used for and why?
Because iron rusts very slowly.
It is used to boil the water, which makes sure
there is no air in the water.
Because oil is lighter than water.
(lower density)
It is used to keep air out of water.
(It doesn't dissolve.)

17. Brainstorm
What is the key point of this experiment?