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Chemistry of the Elements
Chemistry of the Elements
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1
Which is a test for carbonate ions?
Add alkali, bubbles turn limewater cloudy
Barium chloride is added forming a white precipitate
Add acid, bubbles turn limewater cloudy
Barium nitrate is added forming a white precipitate
2
AgNO
3
is used to test for halide ions (Gp 7 ions). Which are the correct precipitate colours?
AgCl - yellow, AgBr - white & AgI - cream
AgCl - yellow, AgBr - cream & AgI - white
AgCl - white, AgBr - yellow & AgI - cream
AgCl - white, AgBr - cream & AgI - yellow
3
Which gas in present as 21% of air?
Carbon Dioxide
Argon
Oxygen
Nitrogen
4
What is the test for oxygen?
Lit splint causes squeaky pop
Glowing splint causes a squeaky pop
Lit splint goes out
Glowing splint relights
5
Which of these conditions cause rusting of metals?
Water
Air, Water & Oil
Air & Water
Air
6
Elements that have the same chemical properties usually...
are in the same group
have the same number of electron shells
are in the same period
have the same charge
7
What is the balanced equation for complete burning of magnesium in air?
Mg + O2 ---> MgO2
Mg + O ---> MgO
4Mg + O2 ---> 2Mg2O
2Mg + O2 ---> 2MgO
8
When Br
2
is added to NaF...
NaBr is formed as Br is more reactive than F
NaBr is formed as F is more reactive than Br
No reaction as Br is more reactive than F
No reaction as F is more reactive than Br
9
Complete the general equation: Acid + Metal ---> ...........................
Salt + Water
Salt + Hydrogen
Salt
Salt + Water + Carbon Dioxide
10
As you go down group 7 the reactivity of the elements...
Increases and then decreases
Decreases
Increases
Stays the same
11
The decomposition of hydrogen peroxide forms which products?
Water and Oxygen
Hydrogen and Oxygen
Oxygen only
Hydrogen only
12
True or false, displacement reactions are redox reactions (e.g. NaI + F
2
---> NaF + I
2
)?
True always
False always
False mostly
True mostly
13
What is the balanced equation for complete burning of hydrogen in air?
2H + O2 ---> 2HO
4H + O2 ---> 2H2O
2H2 + O2 ---> 2H2O
H + O ---> HO
14
The reactivity of group 1 elements increases down the group because...
The outer shell electrons get closer to the nucleus
The outer shell electrons get further from the nucleus
The reaction with water becomes more vigorous
This will give the elements a full outer shell
15
When Br
2
is added to NaI...
No reaction as I is more reactive than Br
NaBr is formed as Br is more reactive than I
No reaction as Br is more reactive than I
NaBr is formed as I is more reactive than Br
16
Why are noble gases not reactive?
They have a full outer shell of electrons
They have no electrons in their outer shell
They have the same number of electrons as protons
They have 8 electrons in their outer shell
17
Which of these is a test for water?
Anhydrous Copper (II) Sulphate: White to Blue
Anhydrous Copper (II) Sulphate: Blue to pink
Anhydrous Cobalt (II) Chloride: White to Blue
Anhydrous Cobalt (II) Chloride: Blue to pink
18
Which is a test for hydrogen gas?
Glowing splint relights
Lit splint causes squeaky pop
Lit splint goes out
Glowing splint causes squeaky pop
19
Which of these is
not
a use of noble gases?
To fill light bulbs as it doesn't react with the filament
Used to make salts as they react with metals
Used in balloons as it is less dense than air
Used in signs as it glows when a current is passed
20
The reactivity of group 7 elements decreases down the group because...
The reaction with water becomes more vigorous
The outer shell electrons get closer to the nucleus
The outer shell electrons get further from the nucleus
This will give the elements a full outer shell
21
Which of these form an acid when dissolved in water: SO
2
, MgO, CO
2
& H
2
O?
SO2 Only
SO2 & CO2
MgO Only
SO2, MgO & CO2
22
Which gas in present as 78% of air?
Nitrogen
Argon
Oxygen
Carbon Dioxide
23
Which group contains inert elements?
Alkali metals
Halogens
Alkali earth metals
Noble gases
24
Which is a test for sulfate ions?
Add alkali, bubbles turn limewater cloudy
Add acid, bubbles turn limewater cloudy
Barium chloride is added forming a white precipitate
Barium nitrate is added forming a white precipitate
25
What is the balanced equation for complete burning of carbon in air?
2C + O2 ---> 2CO
C + O ---> CO
C + O2 ---> CO2
4C + O2 ---> 2C2O
26
Which is a test for ammonia?
Red litmus turns blue
Damp starch-iodide paper turns blue-blac
Blue litmus turns red only
Blue litmus turns red then white
27
Complete the balanced equation: HCl + Mg ---> ................................
HCl + Mg ---> MgClH
2HCl + Mg ---> MgCl2 + H2
HCl + Mg ---> MgCl + H
2HCl + 2Mg ---> 2MgCl + H2
28
Oxidation is...
The removal of electrons
The gain of oxygen
The gain of electrons
The removal of oxygen
29
Which of these flame test colours are incorrect?
Li, K, Sr & Ba
Na, K, Sr & Ba
Li, Na, K, & Sr
Na, K, Sr & Cu
30
Which gas in present as 0.04% of air?
Nitrogen
Argon
Oxygen
Carbon Dioxide
31
Which describes water that has a solute dissolved into it (used to test purity of water)?
It has a higher b.p and m.p. than pure water
It has a higher b.p and lower m.p. than pure water
It has a lower b.p and m.p. than pure water
It has a lower b.p and higher m.p. than pure water
32
As you go down group 1 the reactivity of the elements...
Stays the same
Decreases
Increases and then decreases
Increases
33
Reduction is...
The gain of electrons
The removal of oxygen
The gain of oxygen
The removal of electrons
34
Which of these coatings is not used to protect iron from rusting?
Carbon
Zinc (galvanising)
Paint
Grease or oil
35
Cations form metal hydroxides when mixed with NaOH, which colours are correct?
Ca2+ - white, Cu2+ - blue, Fe2+ - green & Fe3+ - red/brown
Ca2+ - white, Cu2+ - blue, Fe2+ - red/brown & Fe3+ - green
Ca2+ - blue, Cu2+ - white, Fe2+ - green & Fe3+ - red/brown
Ca2+ - blue, Cu2+ - white, Fe2+ - red/brown & Fe3+ - green
36
What is the balanced equation for complete burning of sulfur in air?
S2 + 2O2 ---> 2SO2
S + O ---> SO
S + O2 ---> SO2
2S + O2 ---> 2SO
37
Complete the balanced equation: H
2
SO
4
+ Al ---> ................................
3H2SO4 + 2Al ---> Al2(SO4)3 + 3H2
H2SO4 + Al ---> AlSO4 + H2
H2SO4 + 2Al ---> Al2SO4 + H2
2H2SO4 + 3Al ---> Al3(SO4)2 + 2H2
38
In which solvents with HCl be acidic?
Methylbenzene
Water
Cyclohexene
Cyclohexane
39
Which of these describe an acid + metal reaction?
Endothermic - Releases heat to the surroundings
Endothermic - Takes heat from the surroundings
Exothermic - Releases heat to the surroundings
Exothermic - Takes heat from the surroundings
40
Which term is used to describe reactions that have simultaneous oxidation and reduction?
Redox
Oxred
Disproportionation
Displacement
41
Which kind of ions do flame tests test for?
Positive ions (anions)
Positive ions (cations)
Negative ions (cations)
Negative ions (anions)
42
Which is a test for chlorine gas?
Red litmus turns blue
Blue litmus turns red only
Damp starch-iodide paper turns blue-blac
Blue litmus turns red then white
43
Which of these form an alkaline solutions when dissolved in water: SO
2
, MgO, CO
2
& NaOH?
SO2 & CO2
NaOH Only
CO2 Only
MgO & NaOH
