Group 2/7

Question 1

trends going down group 2 (7)

Answer 1

Increase in radius
Increase in melting point
Increase in density
Increase in reactivity
Ionisation energies decrease
Thermal stability increases
Solubility increases

Question 2

metal + oxygen →

Answer 2

metal oxide

Question 3

how to produce aq. calcium hydroxide

Answer 3

excess water and calcium oxide

Question 4

flame colour of strontium

Answer 4

red

Question 5

flame colour of calcium

Answer 5

brick red

Question 6

flame colour of barium

Answer 6

green

Question 7

metal + water →

Answer 7

metal hydroxide + H2

Question 8

hot magnesium + water →

Answer 8

metal oxide + H2

Question 9

colour of magnesium oxide

Answer 9

white solid

Question 10

observation of calcium hydroxide

Answer 10

cloudy white suspension

Question 11

metal carbonates decomposition

Answer 11

metal oxide + CO2

Question 12

metal nitrates decomposition

Answer 12

metal oxide + NO2 + O2

Question 13

describe fluorine

Answer 13

pale yellow gas

Question 14

describe chlorine

Answer 14

green gas

Question 15

describe bromine

Answer 15

orange liquid

Question 16

describe iodine

Answer 16

purple vapour/black solid

Question 17

describe reaction between hydrogen and fluorine

Answer 17

reacts explosively in cool/dark

Question 18

describe reaction between hydrogen and chlorine

Answer 18

reacts in sunlight

Question 19

describe reaction between hydrogen and bromine

Answer 19

reacts slowly when heated

Question 20

describe reaction between hydrogen and iodine

Answer 20

froms equilibrium when heated

Question 21

which hydrogen halide is least thermally stable

Answer 21

HI

Question 22

what is the test for halide ions

Answer 22

AgNO3 + X- → AgX + NO3-

Question 23

what is the complex ion

Answer 23

AgCl + 2NH3 → [Ag(NH3)2]Cl

Question 24

precipitate of AgCl

Answer 24

white

Question 25

precipitate of AgBr

Answer 25

cream

Question 26

precipitate of AgI

Answer 26

yellow

Question 27

which silver halide dissolves in aq.ammonia

Answer 27

AgCl

Question 28

which silver halides dissolves in conc.ammonia

Answer 28

AgCl, AgBr

Question 29

what does the reaction between hydrogen halides and h2so4 show

Answer 29

acid is a strong oxidising agent

ability to be reduced increases going down the group

Question 30

which hydrogen halide doesn’t get oxidised by h2so4

Answer 30

HCl

Question 31

initial equation for all halide and acid reaction

Answer 31

NaX + H2SO4 → NaHSO4 + HX

Question 32

final equation for reaction chlorine and acid

Answer 32

NaCl + H2SO4 → NaHSO4 + HCl

Question 33

final equation for reaction bromine and acid

Answer 33

2HBr + H2SO4 → 2H2O + Br + SO2

Question 34

final equation for the reaction iodide and acid

Answer 34

8HI + H2SO4 → 2H2O + 4I2 + H2S

Question 35

observation of hydrogen halides

Answer 35

steamy fumes

Question 36

definition of disproportionation

Answer 36

redox happening for one atom

Question 37

condition for chlorine and alkali to form sodium chlorate (I)

Answer 37

15 degrees

Question 38

condition for chlorine and alkali to form sodium chlorate (III)

Answer 38

70 degrees

Question 39

reaction chlorine and cold alkali

Answer 39

Cl2 + 2NaOH → NaCl + NaClO + H2O

Question 40

reaction chlorine and hot alkali

Answer 40

3Cl2 + 6NaOH → 5NaCl + NaClO3 + 3H2O

Question 41

oxidation of chlorine in cold alkali

Answer 41

½ Cl2 + 2OH- → ClO- + H2O + e

Question 42

use of chlorine compounds

Answer 42

chlorination of water
bleach
PVC
solvents

Question 43

chlorination of water reaction

Answer 43

Cl2 + H2O → HCl + HClO (chloric I acid)

Question 44

bleach compound

Answer 44

NaClO