Section 2 - Group 2 and Group 7 Elements Flashcards Preview

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Flashcards in Section 2 - Group 2 and Group 7 Elements Deck (57)
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1

What type of ions do group 2 metals form?

2ions.

2

What is the trend in atomic radius down group 2 and why?

Increases - extra electron shells are added.

3

What is the trend in First Ionisation Energy down group 2 and why?

Decreases because...

- electron shells increase

- shielding occurs 

- electrons are futher from nucleus

4

What is the trend in reactivity down group 2 and why?

Increases because...

- First IE decreases

- Easier to lose electrons

5

What is the trend in mpts down group 2 and why?

Decreases...

- they have metallic structures

- metal ions get bigger but no. of electrons stays the same

- larger ionic radius means the electrons are further from the nuclei

6

What are group 2 elements reduced or oxidised when reacted?

Oxidised

7

What is the trend in solubility when reacting Mg, Ca, Sr and Ba with OH-?

Increases

8

What is the trend in solubility when reacting Mg, Ca, Sr and Ba with SO42-?

Decreases.

9

What is the solubility of Mg(OH)2?

Sparingly soluble

10

What is the solubility of BaSO4?

Insoluble

11

What is the test for sulfate ions?

Add acidified barium chloride to a solution containing sulfate ions and a white precipitate of barium sulfate will form.

12

Why must you acididfy the solution in the sulfate ions test?

To get rid of lurking sulfites or carbonates which would also produce a white precipitate

13

What can be used to neutralise acid soils?

Calcium hydroxide (Ca(OH)2)

14

What can be used to neutralise excess stomach acid?

Magnesium hydroxide (Mg(OH)2)

15

Give the ionic equation for neutralisation:

H+(aq) + OH-(aq)  ---> H2O(l)

16

Explain the barium meal:

- a patient swallows a suspension of barium sulfate

- it coats their tissues

- it is opaque to x-rays so the tissues are visible

17

Explain how magnesium can be used to extract titanium from its ore and give the equation:

TiCl4(g) + Mg2(g) ---> Ti(s) + 2MgCl(l)

- TiO(the main titanium ore) is converted to titanium chloride (TiCl4) by heating it with carbom in a stream of chlorine gas

-the titanium chloride is then purified by fractional distillation

- it is reduced by Mg in a furnace at almost 1000oC

18

Explain how calcium oxide and calcium carbonate can be used to remove sulfur dioxide and give the equations:

CaO(s) + 2H2O(l) + SO2(g) ---> CaSO3(s) + 2H2O(l)

CaCO3(s) + 2H2O(l) + SO2(g) > CaCO3(s) + 2H2O(l) + CO2(g)

- powdered calcium oxide (CaO) and calcium carbonate (CaCO3)

-a slurry is made by mixing these with water

- it's sprayed onto the flue gases

- a solid waste product of calcium sulfite is formed 

19

What is the trend in electronegativity down group 7?

Decreases...

- electrons are further from the nucleus

- outer electrons are shielded by inner electrons

20

What is the trend in bpts down group 7?

Increases...

- relative mass increases

- strength of Van der Waals increases

21

What colour is F2?

Pale yellow

22

What state is F2?

Gas

23

What colour is Cl2?

Green

24

What state is Cl2?

Gas

25

What colour is Br2?

Red-brown

26

What state is Br2?

Liquid

27

What colour is I2?

Grey

28

What state is I2?

Solid

29

What is the trend in reactivity down group 7 and why?

Decreases...

- atoms become larger

- distance between electrons and nucleus increases

 

30

A halogen will displace a halide ion from solution if the halide is _____ it in the periodic table.

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