1.the periodic table Flashcards Preview

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Flashcards in 1.the periodic table Deck (25):
1

Colour of Chlorine in water(polar) and cyclohexane(non-polar)

colourless in polar water colourless in non-polar cyclohexane

2

Colour of Bromine in water(polar) and cyclohexane(non-polar)

yellow-orange in polar water yellow-orange in non-polar cyclohexane

3

Colour of Iodine in water(polar) and cyclohexane(non-polar)

brown in polar water purple in non-polar cyclohexane

4

Most powerful group 7 O.A

F2 is the most powerful and so on they can oxidise lower reactivity halide ions

5

colours and states of the pure halides

F2- pale yellow gas CL2- dense green gas Br2- orange/brown liquid (same as a gas) I2- dark grey sold (purple gas)

6

Reactivity series in group 7 and why.

Reactivity decreases down the group. As to form ions they have to gain 1e- and the ionic radi are smaller for the higher up atoms which means e- are more strongly attracted to it. SHieldiung e- and neuclear charge cancel out.

7

Why is the ionic radis bigger in halogens then the atomic radius?

The ions are larger because the repulsion added when all the orbitals are full expands the radius .

8

what does isoelectronic mean

same number of valence e-

9

disproportination

when the same element gets simultaneously oxidised and reduced in a reaction.

10

Form a compound that is a disinfectant for pools, drinking water use....

NaOH + Cl not water +CL

11

Cold!!! forming a disinfectant equation.

Cl2+ 2NaOH --> NaCL + NaClO + H2O

12

hot!!! forming a disinfectant equation.

3Cl2+ 6NaOH --> 5NaCL + NaClO3 + 3H2O

13

Cl2+H2O-->

HCl + HClO

14

What colour are group 1&2 compounds

What colour are group 1&2 solutions

compounds - white

solutions - coulourless

15

Group 2 reactivity

increases as you go down the group, becuas eto react they need to lose e-

Atomic radius increase which decreses attraction and makes it easier to lose e- . SHieldiung e- and neuclear charge cancel out

16

Thermal decompostion of group 2 carbonates

MCO3 --> CO2 + MO

CO2 testing with limewater

( Ca(OH)2+CO2-->CaCO3)

17

Group 2 thermal decomposition order and why.

Easy-MgCO3 Gets harder down the group becuase they are more thermally stable and are harder to decompose.

18

Uses of the group 2 hydroxides Ca(OH)2 and Mg(OH)2

Ca(OH)- is used by farmers and garderners as 'lime' to neutralise acid soils.

Mg(OH)2- is used in 'milk of magnesia' in order to relieve indigestion, it nutralises excess stomach acid.

19

Group 2 oxides and hydroxides are....

bases.... they are neutralised by acids to form a salt and water.

20

soulubilty trend in group 2 hydroxides

they become more soluble down the group, this means lower down metal hydoxides make a more alkali solution.

21

Halide ions with silver nitrate solution.

chloride ions-White (goes coulourless in all ammonia)

Bromide ions- Cream (goes coulourless in conc ammonia)

Iodide ions- Yellow

22

Group 2 metal + water

M + 2H2O--> M(OH)2+H2

23

uses of ionic halide compounds.

NaCl-common salt

NaF(and tin fluoride) added to toothpaste to prevent decay.

CaF2 crystals useds to make lenses that focus infrared light.

24

What is a disadvantage to using chlorine in water treatment.

chlorine is toxic/poisonous and could form chlorinated hydrocarbons (carcinogens)

25

Define periodicity 

a repeating pattern of properties shown across different periods.