Reactions of non-metal/metal oxides with water

Question 1

1. What is the solubility of the oxide: Oxide of potassium + water
2. Colour of the indicator in the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 1

1. Highly soluble
2. Purple violet
3. Alkaline
4. Potassium Hydroxide

Question 2

1. What is the solubility of the oxide: Oxide of carbon + water
2. Colour of the indicator in the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 2

1. Soluble
2. yellow
3. weakly Acidic
4. Carbon dioxide

Question 3

1. What is the solubility of the oxide: Oxide of Iron + water
2. Colour of the indicator is the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 3

1. Insoluble
2. Green [due to distilled water]
3. Neutral
4. N/A

Question 4

1. What is the solubility of the oxide: Oxide of magnesium + water
2. Colour of the indicator is the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 4

1. Forms an suspension
2. Blue
3. Alkaline
4. Magnesium Hydroxide

Question 5

1. What is the solubility of the oxide: Oxide of Sulphur + water.
2. Colour of the indicator is the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 5

1. soluble
2. red
3. Acidic
4. Sulphurous acid

Question 6

1. What is the solubility of the oxide: Oxide of Sodium + water
2. Colour of the indicator is the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 6

1. Insoluble
2. Blue
3. Alkaline
4. Sodium Hydroxide

Question 7

1. What is the solubility of the oxide: oxide of phosphorus + water.
2. Colour of the indicator is the solution [universal indicator]
3. Is the new substance ACIDIC or ALKALINE?
4. Name of the product

Answer 7

1. Soluble
2. red
3. Acidic
4. Phosphoric acid

Question 8

When a non-metal oxide and water react they form a/n?

Answer 8

Acid

Question 9

Non-metallic oxides in solution are?

Answer 9

Acidic

Question 10

All metal oxides in solution form?

Answer 10

Bases

Question 11

When a metal oxides and water react, they from?

[apart from a metal hydroxide]

Answer 11

an alkali

Question 12

When a non-metal oxide and water react, they form?

[apart from non-metal hydroxide]

Answer 12

An acid

Question 13

How is rust formed?

Answer 13

When iron metal, O2 and water moisture react to form a complex compound called rust.

Question 14

Rusting can only occur where?

Answer 14

At the surface of the iron there it is exposed to air

Question 15

Give two ways to prevent rusting

Answer 15

1. Paint it to create a barrier between the surface of the metal and oxygen and moisture.
2. Can be coated with with a thin layer of zinc [metal which do not rust.]- this is done by a process called galvanising.

Question 16

How is acid rain created?

Answer 16

Coal[carbon]-fired power stations + other sources that burn fossil fuels emit CO2, Sulfur dioxide and nitrogen oxides.
It then reacts with the water vapour in the sky to form acids.
These acid then fall back to Earth as precipitation