Inorganic Chemistry- AS LEVEL

Question 1

what is the trend in the 1st ionisation energy in Period 3 elements.
Na-Ar.

Answer 1

-ionisation energy increases.
-nuclear charge increases: more protons
electrons attracted to
+ve nucleus
atomic radius decrease
as a result.
-shielding stays the same.

Question 2

what is the trend in atomic radius for period 3 elements.

Answer 2

atomic radius increases.

Question 3

what is the trend in melting points for period 3 elements - Na,Mg,Al

Answer 3

-increases
-the ionic charge
-sea of delocalised electrons icreases
… metallic bonds increase.

Question 4

what is the trend in the atomic radius for group 2 metals?

Answer 4

increases as you go down the group

Question 5

why does the atomic radius increase for group 2 elements>

Answer 5

no of energy levels increase.

Question 6

what is the trend in the first ionisation energy for group 2 elements?

Answer 6

it decreases

Question 7

why does the 1st IE decrease for group 2 elements?

Answer 7

outer electron is further away from the nucleus.
… greater amount of shielding

Question 8

what is the trend in the melting point for group 2 elements?

Answer 8

it decreases

Question 9

why does the melting point decreases for group 2?

Answer 9

sea of delocalised electrons are further away from nuclei.
charge density decreases

Question 10

which group 2 element doesn’t fit with the melting point trend?

Answer 10

magnesium

Question 11

TRUE or FALSE all group 2 elements become oxidised

Answer 11

TRUE

Question 12

what is the trend in reactivity for group 2 elements with water?

Answer 12

it increases

Question 13

what is the use of magnesium in the extraction of titanium from titanium chloride?

Answer 13

the magnesium displaces titanium chloride in order to produce titanium

Question 14

what is the formation of the hydroxides?
(wen metals react with water)

Answer 14

X+2H2O–>Mg(OH)2 + H2

Question 15

what is the trend in the solubility of the hydroxides in water?

Answer 15

solubility increases as you go down the group

Question 16

TRUE or FALSE Mg(OH)2 is soluble in water

Answer 16

FALSE

Question 17

what is Mg(OH)2 used for in medicine

Answer 17

neutralises excess stomach acid.
causes heartburn-indigestion-wind

Question 18

what is the use of Ca(OH)2 in agriculture?

Answer 18

used to treat acidic soil

Question 19

what other name is Ca(OH)2 referred to?

Answer 19

slaked lime

Question 20

what is the trend in the solubility of the sulphates down the group

Answer 20

solubility decreases.
Mg- most soluble
Ba-least solublee

Question 21

why is acidified BaCl2 solution used to test for sulphate ions?

Answer 21

remove carbonate ions as carbon dioxide

Question 22

What are the results for the presence of sulphate from barium sulphate

Answer 22

a white percipitate of barium sulphate f formed

Question 23

what is the usage of BaSO4 in medicine

Answer 23

used as a barium meal
to highlight the digestive tract under the X-ray.

Question 24

why is the barium meal safe, even though BA is a hard metal

Answer 24

barim sulphate is very insoluble.

Question 25

what is the property of flourine?

Answer 25

pale yellow gas

Question 26

what are the properties of chlorine?

Answer 26

greenish gas

Question 27

what are the properties of bromine

Answer 27

red brown liquid

Question 28

what are the properties of iodine

Answer 28

a black solid

Question 29

what is the trend in the atomic radius for the group 7 elements?

Answer 29

increases extra shell of electrons

Question 30

what is the trend in electronegativity for group 7 elements?

Answer 30

decreases

Question 31

why does the trend in electronegativity decrease for group 7 elements?

Answer 31

outer electron is further from nucleus greater sheilding

Question 32

what is the trend in the boiling point for group 7 elements?

Answer 32

increases as you go down the group.

Question 33

why does the trend in BP and MP occur for group 7 elements?

Answer 33

large atoms=great amount of electrons van der Waals forces between molecules is stronger

Question 34

what is meant by the term oxidising agent

Answer 34

when the thing gets reduced so gain an electron

Question 35

are the group 7 halogens oxidising agents?

Answer 35

YES

Question 36

what is the trend in the oxidising agent for group 7 elements?

Answer 36

it decreases as you go down the group fluorine the most

Question 37

what happens during a displacement reaction of halide ions in an aqueous solution?

Answer 37

the halogen will react with a metal halide

Question 38

give an example of a displacement reaction between a halogen

Answer 38

Cl2 + 2NaBr----> 2NaCl + Br2

Question 39

why does bromine get displaced in the reaction Cl2 + NaBr----> NaCl + Br2

Answer 39

chlorine is more reactive than bromine

Question 40

TRUE or FALSE halide ions can act as reducing agents

Answer 40

TRUE

Question 41

what happens to the halide ion when they are oxidised?

Answer 41

electron is given away and it becomes a halogen molecule

Question 42

what is the trend in the reducing ability forr the halogens?

Answer 42

it increases down the group

Question 43

why does the reducing ability increase down the group?

Answer 43

an electron is lost from the outermost shell due to large atomic radius and greater shielding weaker attraction between the electron and nucleus

Question 44

what do the sodium halides react with?

Answer 44

sulfuric acid

Question 45

what is the process of sodium halides reacting with the sulfuric acid?

Answer 45

few drops of sulfuric acid is added to the sodium halide

Question 46

what is an example of the reaction for sodium halides and sulfuric acid

Answer 46

NaCl + H2SO4--->NaHSO4 + HCl

Question 47

what are the products for the reaction with sulfuric acid and the sodium halide

Answer 47

sodium hydrogensulfate (s) and hydrogen chloride / hydrogen halide

Question 48

How can we test for halides

Answer 48

Using silver nitrate

Question 49

Why do we add nitric acid when we test for halides

Answer 49

To prevent silver nitrate from reacting with the carbonates and hydroxides

Question 50

What is the colour change we add silver nitrate to fluorine

Answer 50

Colourless solution

Question 51

What is the colour change when we add silver nitrate to chlorine

Answer 51

White precipitate

Question 52

What is the colour change we add silver nitrate to bromine

Answer 52

Cream precipitate

Question 53

What is the colour change when we react iodine with silver nitrate

Answer 53

Yellow precipitate

Question 54

Why do we do further testing when we get the silver halides

Answer 54

The colours produced by chlorine iodine and bromine are too similar