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Chemistry > periodic table > Flashcards

periodic table Flashcards

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1
Q

group 2 metal reaction with oxygen

A

2Ca (s) + O2 (g)—> 2CaO (s)

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2
Q

group 2 metal reaction with dilute acid

A

Ca (s) + 2HCl (aq) —-> CaCl2 (aq) + H2 (g)

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3
Q

group 2 metal reaction with water

A

Ca (s) + 2H2O (l) —-> Ca(OH)2 (aq) +H2 (g)

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4
Q

what happens to the solubility of metal hydroxides down the group

A

increases, so increased alkilinity

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5
Q

use of group 2 compounds

A
  • neutralising acid soil
  • indigestion remedies
  • building and construction uses
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6
Q

neutralising acid soils equation

A

Ca(OH)2 (s) + 2HCl (aq) —-> CaCl2 (aq) +2H2O (l)

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7
Q

indigestion remedies

A

Mg(OH)2 + 2HCl —-> MgCl2 + 2H2O

CaCO3 + 2HCl —> CaCl2 + H2O + CO2

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8
Q

Building and construction uses

A

CaCO3 + 2HCl —> CaCl2 + H2O + CO2

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9
Q

electronegativity definition

A

the ability of an atom to attract the bonding pair of electrons in a covalent bond

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10
Q

electronegativity ______ as you go down group 7

A

decreases

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11
Q

halogens act as _____ agents

A

oxidising

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12
Q

halide ions act as _____ agents

A

reducing

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13
Q

colour of chlorine in water

A

pale green

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14
Q

colour of chlorine in cyclohexane

A

pale green

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15
Q

colour of bromine in water

A

orange

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16
Q

colour of bromine in cyclohexane

A

orange

17
Q

colour of iodine in water

A

brown

18
Q

colour of iodine in cyclohexane

A

Violet

19
Q

the element with the ____ oxidising power will displace the other

A

higher

20
Q

what do you use to test for halide ions?

A

silver nitrate

21
Q

colour of chloride precipitate in silver nitrate

A

white

22
Q

colour of bromide precipitate in silver nitrate

A

cream

23
Q

colour of iodide precipitate in silver nitrate

A

yellow

24
Q

solubility of silver halide compounds

A

AgCl soluble in NH3
AgBr insoluble in dilute NH3
AgI insoluble in concentrated NH3

25
Q

chlorine disproportionation reactions

A

Cl2 + H2O —–> HClO + HCl

Cl2 + 2NaOH —-> NaCl + NaClO + H2O

26
Q

benefits and risks of using chlorine

A

chlorine reacts with water and chlorate ions. ClO- kills bacteria in water to minimize diseases BUT is toxic and a respiratory irritant

27
Q

order of halide tests

A

1) carbonate test
2) sulfate test
3) halide test

28
Q

carbonate test

A

dilute acid (e.g. nitric acid)
- bubbles if +ve

29
Q

sulfate test

A

barium nitrate
- white ppt if +ve

Chemistry (11 decks)

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