Hydrogen and water

Question 1

physical test to see if water is pure

Answer 1

boil at 100

freeze at 0

Question 2

chemical test for water

Answer 2

add anhydrous copper (II) sulphate and see if the white powder turns blue

Question 3

hydrated

Answer 3

with water

Question 4

anhydrous

Answer 4

without water

Question 5

reactions of different metals with dilute acids to find out how reacttive they are

Answer 5

1) there reactive the metal ,the faster the reaction
2) the speed to the reaction is indicated by the rate at which the bubbles of hydrogen are given off
3) the hydrogen is confirmed by the burning splint test

Question 6

reaction of dilute hcl and dilute sulphuric acid with magnesium

Answer 6

reacts vigorously with cold dilute acids and produces loads of bubbles

Question 7

reaction of dilute hcl and dilute sulphuric acid with alluminuim

Answer 7

doesn’t react much with cold dilute acids because it has a protective alluvium oxide layer. But, it reacts vigorously with warm dilute acids and produces a lot of bubbles

Question 8

reaction of dilute hcl and dilute sulphuric acid with zinc and iron

Answer 8

both zinc and iron great slowly with dilute acids but more strongly if you heat them up

Question 9

combustion of hydrogen

Answer 9

hyrogen burns in oxygen to form water