Cultural Corner
keys:
reading (passage a)
ques tions:1) the reaction of metals. 2) potassium, calcium and sodium. 3)it burns to for m an oxide. 4) magnesium, aluminium and zinc. 5)it has a slow reaction. 6)no, it doesn’t. 7)it is important to know how metals can react with different substances. it is very useful in our daily life.
passage b
question 1:five.they are aim, apparatus, method, result and conclusion.
fill in blanks
aim to find out if potassium rea cts with cold
water.
apparatus a container, cold water, potassium,
filter paper（濾紙), a pair of tweezers(鑷子）
method (1)half-fill the container with cold water.
(2)take a piece of potassium out of the oil.
(3)dry the potasium with the paper.
(4)put the potassium into the water.
result the potassium burns.
concl usion potassium reacts with cold water.