4.1 Reactivity of Metals

Question 1

Write out a word equation for the reaction between metals and oxygen?

Answer 1

Metals + Oxygen -> Metal oxides

Question 2

What is a redox reaction?

Answer 2

A reaction where both reduction and oxidation occur

Question 3

What does OILRIG stand for?

Answer 3

Oxidation is loss of electrons

Reduction is gain of electrons

Question 4

When metals react with other substances what happens to metal atoms?

Answer 4

They form positive metal ions

Question 5

What is reactivity of a metal related to?

Answer 5

Its tendency to form positive ions

Question 6

Fill out the table for reactions with water

Answer 6

Question 7

Fill out the table for reactions with dilute acid

Answer 7

Question 8

What can be used to extract metals from their oxides?

Answer 8

Reactions with carbon

Only for metals less reactive than carbon

Question 9

What is the half equation for the oxidation of sodium?

Answer 9

Sodium is a group 1 element

Therefore it loses 1 electron

Na-> Na+ + e-
or
Na+ + e- -> Na

Charges must add up to the same number

Question 10

What has been reduced and oxidised in this reaction?
2Na + 2HCl -> 2NaCl + H2

Answer 10

Chlorine is group 7 and sodium is group 1

So we know chlorine must gain an electron and sodium must lose an electron

OILRIG

Oxidation is loss of electrons, sodium has lost electrons therefore has been oxidised

Reduction is gain of electrons, chlorines has gained electrons therefore has been reduced