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Chemistry > Group 2/7 > Flashcards

Group 2/7 Flashcards

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1
Q

trends going down group 2 (7)

A 
Increase in radius
Increase in melting point
Increase in density
Increase in reactivity
Ionisation energies decrease
Thermal stability increases
Solubility increases
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2
Q

metal + oxygen →

A

metal oxide

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3
Q

how to produce aq. calcium hydroxide

A

excess water and calcium oxide

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4
Q

flame colour of strontium

A

red

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5
Q

flame colour of calcium

A

brick red

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6
Q

flame colour of barium

A

green

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7
Q

metal + water →

A

metal hydroxide + H2

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8
Q

hot magnesium + water →

A

metal oxide + H2

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9
Q

colour of magnesium oxide

A

white solid

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10
Q

observation of calcium hydroxide

A

cloudy white suspension

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11
Q

metal carbonates decomposition

A

metal oxide + CO2

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12
Q

metal nitrates decomposition

A

metal oxide + NO2 + O2

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13
Q

describe fluorine

A

pale yellow gas

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14
Q

describe chlorine

A

green gas

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15
Q

describe bromine

A

orange liquid

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16
Q

describe iodine

A

purple vapour/black solid

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17
Q

describe reaction between hydrogen and fluorine

A

reacts explosively in cool/dark

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18
Q

describe reaction between hydrogen and chlorine

A

reacts in sunlight

19
Q

describe reaction between hydrogen and bromine

A

reacts slowly when heated

20
Q

describe reaction between hydrogen and iodine

A

froms equilibrium when heated

21
Q

which hydrogen halide is least thermally stable

A

HI

22
Q

what is the test for halide ions

A

AgNO3 + X- → AgX + NO3-

23
Q

what is the complex ion

A

AgCl + 2NH3 → [Ag(NH3)2]Cl

24
Q

precipitate of AgCl

A

white

25
Q

precipitate of AgBr

A

cream

26
Q

precipitate of AgI

A

yellow

27
Q

which silver halide dissolves in aq.ammonia

A

AgCl

28
Q

which silver halides dissolves in conc.ammonia

A

AgCl, AgBr

29
Q

what does the reaction between hydrogen halides and h2so4 show

A

acid is a strong oxidising agent

ability to be reduced increases going down the group

30
Q

which hydrogen halide doesn’t get oxidised by h2so4

A

HCl

31
Q

initial equation for all halide and acid reaction

A

NaX + H2SO4 → NaHSO4 + HX

32
Q

final equation for reaction chlorine and acid

A

NaCl + H2SO4 → NaHSO4 + HCl

33
Q

final equation for reaction bromine and acid

A

2HBr + H2SO4 → 2H2O + Br + SO2

34
Q

final equation for the reaction iodide and acid

A

8HI + H2SO4 → 2H2O + 4I2 + H2S

35
Q

observation of hydrogen halides

A

steamy fumes

36
Q

definition of disproportionation

A

redox happening for one atom

37
Q

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

A

15 degrees

38
Q

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

A

70 degrees

39
Q

reaction chlorine and cold alkali

A

Cl2 + 2NaOH → NaCl + NaClO + H2O

40
Q

reaction chlorine and hot alkali

A

3Cl2 + 6NaOH → 5NaCl + NaClO3 + 3H2O

41
Q

oxidation of chlorine in cold alkali

A

½ Cl2 + 2OH- → ClO- + H2O + e

42
Q

use of chlorine compounds

A

chlorination of water
bleach
PVC
solvents

43
Q

chlorination of water reaction

A

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

44
Q

bleach compound

A

NaClO

Chemistry (15 decks)

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