Chapter 14 Periodic Table and trends

Question 1

What are Group 1 Metals called?

Answer 1

Alkali metals

Question 2

What is the physical properties of alkali metals?

Answer 2

1. Soft, can be cut easily
2. Low melting and boiling point
3. Low density
4. Good conductor of heat and electricity due to mobile electrons

Question 3

Chemical properties of alkali metals

Answer 3

1. Alkali metals are very reactive and are usually stored in oil
2. React with water to form an alkali solution and hydrogen gas
3. Powerful reducing agents
4. Form white-coloured compounds that dissolve in water to give a colourless solution

Question 4

Trends down group 1

Answer 4

1. Density generally increases
2. Reactivity increases
3. Melting and boiling points decreases

Question 5

What are group 7 elements called?

Answer 5

Halogens

Question 6

Physical properties of halogens

Answer 6

1. Exist as diatomic molecules
2. Low melting point and boiling point
3. Coloured substances

Question 7

Chemical properties of halogens

Answer 7

1. Undergo displacement reactions, more reactive halogen can displace less reactive halogen from its salt solution
2. Powerful oxidising agents

Question 8

Colour and state at r.t.p of group 7 elements

Answer 8

Fluorine = pale yellow, gas
Chlorine = greenish yellow, gas
Bromine = reddish brown, liquid
Iodine = purplish black, brown in solution, solid

Question 9

Trends down group 7 elements

Answer 9

1. Reactivity decreases
2. Melting and boiling point increases
3. Colour intensity increases (become darker)

Question 10

What are group 0 elements called?

Answer 10

Noble gases

Question 11

Physical properties of group 0 elements

Answer 11

1. Exist as individual atoms (monoatomic)
2. Unreactive
3. Low melting and boiling point
4. Colourless gases