Chemistry Of The Elements

Question 1

Are non metal oxides acidic or alkaline?

Answer 1

Acidic

Question 2

Which group are the noble gases?

Answer 2

0 or 8

Question 3

What is chlorines colour and state at room temperature?

Answer 3

Gas and Green

Question 4

What is bromines colour and state at room temperature?

Answer 4

Brown Liquid

Question 5

What is iodines colour and state at room temperature?

Answer 5

Dark grey solid

Question 6

What is the equation for the decomposition of Hydrogen Peroxide?

Answer 6

2H2O2, — 2H2O + O2

Question 7

What happens when magnesium reacts with oxygen in air?

Answer 7

Bright white flame, white solid appears

Question 8

What happens when carbon reacts with oxygen in air?

Answer 8

Red glow, colourless gas,

Question 9

What happens when sulphur reacts with oxygen in air?

Answer 9

Blue flame, colourless gas

Question 10

What is the chemical test for water,

Answer 10

Anhydrous copper sulphate is white, it turned blue forming a hydrated salt, when water is present

Question 11

Describe a chemical test to show water is pure

Answer 11

Pure water boils at 100c and freezes at 0c

Question 12

What is the order of the reactivity series

Answer 12

Potassium
Sodium
Lithium
Calcium
Magnesium
Zinc
Iron
Copper

Question 13

Why can’t Iron displace magnesium in a solution of magnesium sulphate?

Answer 13

Because magnesium is more reactive

Question 14

How can rusting be prevented?

Answer 14

Galvanising is the covering iron with zinc,

Question 15

How does galvanisation work?

Answer 15

If iron is covered with a more reactive metal such as zinc, the zinc will react in preference to the iron

Question 16

What is the flame colour for the lithium Ion (Li+)

Answer 16

Red

Question 17

What is the flame colour for the sodium Ion (Na+)

Answer 17

Yellow

Question 18

What is the flame colour for the potassium (K+)

Answer 18

Lilac

Question 19

What is the flame colour for the calcium Ion (Ca 2+)

Answer 19

Brick red

Question 20

What happens when sodium hydroxide is added to copper?

Answer 20

Blue precipitate forms

Question 21

What happens when sodium hydroxide is added to Iron (Fe 2+)

Answer 21

Green precipitate forms

Question 22

What happens when sodium hydroxide is added to Iron (Fe 3+)

Answer 22

Brown precipitate forms

Question 23

Are metal oxides acidic or alkaline?

Answer 23

Alkaline (base)