Minerals to Metals Part 13

Question 1

Why is it necessary to keep sodium and calcium under paraffin oil?

Answer 1

They are both highly reactive metals with oxygen and water

Question 2

Why is it important to ensure that metal surfaces are cleaned with sandpaper?

Answer 2

To remove any oxides present on them

Question 3

What does the water bath in a reaction do?

Answer 3

Increase kinetic energy and therefore the rate of a reaction

Question 4

What do sodium, calcium, potassium and magnesium produce when reacted with water?

Answer 4

A metal hydroxide and hydrogen gas

Question 5

What does OILRIG stand for in terms of electrons?

Answer 5

Oxidation is loss and reduction is gain

Question 6

What can oxidation be described as?

Answer 6

Gain of oxygen, loss of electrons, loss of hydrogen

Question 7

What can reduction be described as?

Answer 7

Loss of oxygen, gain of electrons, gain of hydrogen

Question 8

For a substance to be electrolysed, what must it be?

Answer 8

Molten or in solution

Question 9

What is the overall reaction of oxidation and reduction called?

Answer 9

A REDOX reaction

Question 10

What does a thermite reaction produce?

Answer 10

Extreme heat, bight light, loud sounds, sparks flying and a high amount of energy

Question 11

What is a thermite reaction an example of?

Answer 11

An exothermic REDOX reaction