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Flashcards in Periodicity Deck (27)
1

Define periodicity

A repeating trend in properties across each period

2

Define 1st ionisation energy

The energy required to remove 1e mole from 1 mole of gaseous atoms to form 1 mole of 1+ ions

3

What factors affect ionisation energy?

1. Nuclear charge
2. Electron shielding
3. Distance

4

How do group 2 oxides react with water?

They produce a metal hydroxide

5

How do group 2 oxides react with dilute acid?

They react to form a salt and water

6

How do group 2 hydroxides react with dilute acids?

They form a salt and water

7

How does solubility in group 2 hydroxides change?

It increases down the group

8

How does the solubility of group 2 sulphates change?

It decreases down the group

9

What uses of group 2 compounds are there?

Ca(oh)2 slaked lime used in agriculture
Ca(oh)2 aqueous is limewater
Mg(oh)2 milk of magnesium

10

How do halogens react?

They are oxidising agents

11

What is the halogen displacement rule?

A more reactive halogen will displace a less reactive halogen in a solution of its ions

12

What is chlorine’s colour in water?

Pale green

13

What is bromines colour in water?

Orange

14

What is iodine’s colour in water?

Brown

15

What is chlorine’s colour in hexane?

Pale green

16

What is bro Ines colour in hexane?

Red

17

What is iodine’s colour in hexane?

Violet

18

Define disproportionation

The oxidation and reduction of the same element in a displacement reaction

19

What is the difference between reactions a halogen with a hot or cold alkali?

The halogens oxidation no. in the acid produced

20

What is the test for chlorine?

Bleaches damp litmus

21

What is the test for iodine?

Add iodine indicator

22

What is the test for bromine?

Add to potassium iodide and it should turn red-brown

23

Why do some hydrogen halides have high bps?

Hydrogen bonding is really strong

24

Are hydrogen halides soluble?

Yes and they react to form ions

25

What colour is silver chloride?

White

26

What colour is silver bromide?

Cream

27

What colour is silver iodide?

Yellow