Groups

Question 1

What group are alkali metals in

Answer 1

Group 1

Question 2

What are the 3 main properties of alkali metals

Answer 2

1. Soft
2. Low melting points
3. More reactive

Question 3

What happens to the reactivity in alkali metals as u go down the group

Answer 3

The reactivity increases

Question 4

What happens to the boiling and melting points in alkali metals as u go down the group

Answer 4

The melting and boiling points decrease

Question 5

Why are alkali metals so reactive (3)

Answer 5

1. As u fo down the group the atoms radius gets bigger
2. This means the outer shell gets further away from the positive nucleus
3. The increased distance weakens the forces of attraction between the positive nucleus and outer electron meaning the electron can be lost easier

Question 6

What happens to alkali metals when they react with water and what do they form

Answer 6

Alkali metals react vigorously with water forming metal hydroxide and hydrogen

Question 7

What is formed when alkali metals react with oxygen

Answer 7

Metal oxides

Question 8

Properties of flourine

Answer 8

Poisonous yellow gas, very reactive

Question 9

Properties of chlorine

Answer 9

Poisonous green gas (less reactive)

Question 10

Properties of bromine

Answer 10

Red/brown volatile poisonous liquid

Question 11

Properties of iodine

Answer 11

Dark grey solid that can form poisonous purple vapour

Question 12

What sort of molecules are halogens

Answer 12

Diatomic molecules

Question 13

What happens to the melting and boiling points in halogens as u go down the group

Answer 13

The melting and boiling points increase down the group

Question 14

What happens to the reactivity in halogens as u decrease down the group

Answer 14

The reactivity decreases down the group

Question 15

Why does the reactivity decrease down the group in halogens (3)

Answer 15

1. As u go down the group the outer shell gets further away from the positive nucleus
2. This means the forces of attraction needed to pull in an extra electron gets weaker
3. The electron shielding also increases as the number of electrons shells increase

Question 16

Define displacement reaction

Answer 16

When a more reactive element displaces a less reactive element from its compound

Question 17

What is a halide and how is it formed

Answer 17

Its formed when a halogen gains an electron to form a 1- ion e.g. flouride

Question 18

What does inert mean

Answer 18

Full outer shells so there is no reaction

Question 19

What are 2 properties of nobel gasses

Answer 19

1. Inert
2. Non-flammable

Question 20

What happens to the melting and boiling point in nobel gasses as u go down the group

Answer 20

The melting and boiling point increases as u go down the group