Period 3 Year 1/2

Question 1

What are the trends in atomic radius?

Answer 1

Decreases as you go across a period.

Question 2

Why does the atomic radius decrease

Answer 2

As the proton number increases so it attracts the outer electrons towards the nucleus.

Question 3

How does first ionisation energy differ across a period?

Answer 3

Increases across a period

Question 4

Where does the trend of ionisation energy change?

Answer 4

Dip for period 3 and dip for period 6

Question 5

What is the bonding for Na Mg and Al?

Answer 5

Metallic bonding

Question 6

What is the bonding got silicon

Answer 6

Giant covalent bonding

Question 7

What is the bonding for P,S,Cl?

Answer 7

Covalent bonding

Question 8

What is the melting point for Al,Mg and Na

Answer 8

Al is the strongest as has more electrostatic attraction! Stronger metallic bonding.
Then Mg and Na

Question 9

What is the melting point of silicon

Answer 9

As it is a macromolecule
High melting point

Question 10

Which element ihas the highest met,int point out of P,S,Cl?

Answer 10

S8,P4, Cl2
As more stronger van der walls forces

Question 11

What are properties of metal?

Answer 11

Shiny
Conduct electricity
React with dilute acids to give hydrogen and salts.

Question 12

What are properties of Silicon?

Answer 12

Conduct electricity
useful semiconductors

Question 13

What are properties of phosphorus, sulfur, chlorine?

Answer 13

They do not conduct electricity and have low boiling points and melting points.

Question 14

What metals react with cold water?

Answer 14

Sodium and magnesium

Question 15

What happens when sodium reacts with water?

Answer 15

It is a vigorous reaction.
Sodium floats on the surface of the water and fizzes rapidly because of the heat released by reaction. Produces w strong alkaline

Question 16

What happens when magnesium reacts with cold water?

Answer 16

It is a very slow reaction and only a few hydrogens particles form.

Question 17

How does magnesium react with steam?

Answer 17

Mg(s) + H2O(g) —> MgO (s) +H2(g)
this is a much faster reaction.

Question 18

What are reactions with oxygen?

Answer 18

The reactions are exothermic.

Question 19

How does sodium react with oxygen?

Answer 19

It burns brightly- with yellow flames Form a white sodium oxide

Question 20

Equation for sodium reacting with oxygen.

Answer 20

2Na(s) + 1/2O2 (g) —> Na2O(s)

Question 21

How does magnesium react with oxygen?

Answer 21

It burns in air with a bright white flame. A white powder is produced (magnesium oxide).
If magnesium was burned and lowered into a gas jar of oxygen- the flame is even more intense.

Question 22

How does Aluminium react with oxygen?

Answer 22

If heated and put into a gas jar of oxygen, it burns brightly to give aluminum dioxide.

Question 23

How does silicon react with oxygen?

Answer 23

Si(s) + O2–> SiO2(s)