1.6 The Periodic Table

Question 1

What is the oxidation number of an uncombined element?

Answer 1

0

Question 2

What is the sum of oxidation numbers of elements in uncharged species?

Answer 2

0

Question 3

What is the sum of oxidation numbers of elements in an ion?

Answer 3

charge of ion

Question 4

What is the oxidation number of halogens? (group 7)

Answer 4

-1

Question 5

What is the oxidation number of oxygen?

Answer 5

-2

Question 6

What is the oxidation number of hydrogen?

Answer 6

+1

Question 7

What is the oxidation number of hydrogen in metal hydrides?

Answer 7

-1

Question 8

What is the oxidation number of oxygen in peroxides?

Answer 8

-1

Question 9

What is OIL RIG?

Answer 9

Oxidation is loss of electrons
Reduction is gain of electrons

Question 10

What is a redox reaction?

Answer 10

Where oxidation and reduction both takes place in a chemical reaction

Question 11

What is an oxidising agent?

Answer 11

a species that accepts electrons, thereby helping oxidation.
It becomes reduced itself in the process

Question 12

What is a reducing agent?

Answer 12

a species that donates electrons, thereby helping reduction.
It becomes oxidised itself in the process

Question 13

What is the solubility of salts in group 1?

Answer 13

soluble

Question 14

What is the solubility of hydroxides in group 2?

Answer 14

magnesium is insoluble
solubility increases down the group

Question 15

What is the solubility of carbonates in group 2?

Answer 15

insoluble

Question 16

What is the solubility of sulphates in group 2?

Answer 16

magnesium is soluble
solubility decreases down the group

Question 17

What is the solubility of nitrates?

Answer 17

all soluble

Question 18

What is the solubility of chlorides?

Answer 18

all soluble

Question 19

What is the flame colour test of lithium?

Answer 19

red

Question 20

What is the flame colour test of sodium?

Answer 20

yellow

Question 21

What is the flame colour test of potassium?

Answer 21

lilac

Question 22

What is the flame colour test of magnesium?

Answer 22

bright white (only as a solid)

Question 23

What is the flame colour test of calcium?

Answer 23

brick red

Question 24

What is the flame colour test of strontium?

Answer 24

crimson red

Question 25

What is the flame colour test of barium?

Answer 25

apple green

Question 26

What element is the most electronegative?

Answer 26

Fluorine

Question 27

What is the trend of ionisation energy in the periodic table?

Answer 27

decreases down the group general increase left to right in periods

Question 28

What happens to melting point as you go down group 1?

Answer 28

decreases

Question 29

What happens to melting point as you go down group 7?

Answer 29

increases because the intermolecular forces become stronger as the atom gets bigger

Question 30

metal + water --->

Answer 30

metal hydroxide + hydrogen gas

Question 31

How does magnesium react with water?

Answer 31

magnesium will burn in steam MgOH will thermally decompose to produce MgO

Question 32

What is the general equation for the reaction between silver ions and halide ions?

Answer 32

Ag+(aq) + X-(aq) ----> AgX(s)

Question 33

What is the precipitate colour of chloride?

Answer 33

white

Question 34

What is the precipitate colour of bromide?

Answer 34

cream

Question 35

What is the precipitate colour of iodide?

Answer 35

yellow

Question 36

What is the trend of volatility of the halogens?

Answer 36

decreases down the group

Question 37

Are halogens good oxidising agents? if so why?

Answer 37

yes because they accept electrons from species being oxidised and reduced as a result this oxidising power decreases down the group as their ability to attract electrons decrease due to shielding ad greater atomic radius

Question 38

What is used if the precipitates formed from the halide ions are not clear from silver nitrate?

Answer 38

ammonia

Question 39

What happens to the precipitate when dilute ammonia is added?

Answer 39

Cl- precipitate dissolves Br- no change I- no change

Question 40

What happens to the precipitate when concentrated ammonia is added?

Answer 40

Cl- dissolves Br- precipitate dissolves I- no change

Question 41

What is the physical state of fluorine at room temp?

Answer 41

pale yellow gas

Question 42

What is the physical state of chlorine at room temp?

Answer 42

greenish yellow gas

Question 43

What is the physical state of bromine at room temp?

Answer 43

orange brown liquid vapour orange brown

Question 44

What is the physical state of iodine at room temp?

Answer 44

grey black solid purple vapour

Question 45

What is observed when chloride is added to potassium bromide?

Answer 45

orange brown solution

Question 46

What is observed when litmus solution is added to an acid or base/alkali?

Answer 46

acid - turns red base- blue

Question 47

What is used to test for sulphate ions?

Answer 47

barium chloride

Question 48

What is observed for a positive result of sulfate ions and barium chloride?

Answer 48

white precipitate