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WorksheetsMultiple Choices CAIE AS
Total questions: 15
Worksheet time: 14mins
When solid ammonium chloride dissociates at a certain temperature in a 0.500 dm3 container, ammonia and hydrogen chloride are formed.
NH4Cl (s) = NH3(g) + HCl (g) (reversible reaction)
The initial amount of ammonium chloride was 1.00 mol, and when the system had reached equilibrium there was 0.300 mol of ammonium chloride.
What is the numerical value of Kc for this reaction under these conditions?
0.490
1.63
1.96
3.27
Which stage in the free radical substitution of ethane by chlorine has the lowest activation energy?
Cl2 → 2Cl ●
Cl ● + C2H6 → C2H5● + HCl
C2H5● + Cl2 → C2H5Cl + Cl ●
Cl ● + C2H5● → C2H5Cl
Solid aluminium chloride sublimes at 178oC.
Which structure best represents the species in the vapour at this temperature?
A 0.005 mol sample of anhydrous calcium carbonate was completely thermally decomposed to give 100 cm3 of gas measured at a certain temperature and pressure.
In a separate experiment carried out at the same temperature and pressure, a 0.005 mol sample of anhydrous calcium nitrate was completely thermally decomposed. The volume of gaseous products was measured.
What total volume of gaseous products was produced from the calcium nitrate?
50 cm3
100 cm3
200 cm3
250 cm3
Ammonia gas, NH3, and hydrogen sulfide gas, H2S, react together to form the salt ammonium sulfide, (NH4)2S. Ammonium sulfide dissolves in water to produce an orange alkaline solution.
(NH4)2S(aq) == NH3(aq) + NH4SH(aq) (reversible reaction)
The addition of NaOH(aq) to this solution produces a gas, X.
The addition of HCl (aq) to a separate portion of this solution produces a gas, Y.
What are the identities of X and Y?
X: H2S Y: H2S
X: H2S Y: NH3
X: NH3 Y: H2S
X: NH3 Y: NH3
An excess of chlorine gas, Cl2, is passed through 60 cm3 of cold aqueous 0.1 mol dm–3 sodium
hydroxide. In a separate experiment an excess of chlorine gas is passed through 60 cm3 of hot aqueous 0.1 mol dm–3 sodium hydroxide until no further reaction takes place.
How much more sodium chloride will be produced by the reaction with hot NaOH than with cold NaOH?
0.002 moles
0.003 moles
0.005 moles
0.006 moles
W, X, Y and Z
W, X and Y only
W, X and Z only
W and X only
A cycloalkene with the molecular formula C7H12 was oxidised by hot concentrated acidified MnO4–. The only organic product was 2-methylhexane-1,6-dioic acid.
What is the identity of the cycloalkene?
δ+
+
δ-
-
How many isomeric esters, including structural isomers and stereoisomers, can be made with the molecular formula C5H10O2, if methanoic acid is one of the two reactants used?
2
3
4
5
In an experiment, 10 cm3 of an organic compound, J, in the gaseous state was sparked with an excess of oxygen. 20 cm3 of carbon dioxide and 5 cm3 of nitrogen were obtained among the products. All gas volumes were measured at the same temperature and pressure.
What could be the identity of J?
C2H6N2
C2H3N
C2H7N
YZ
Y2X
Z2X
At higher pressure, there are more particles per unit volume.
The composition of the equilibrium mixture does not change.
There are more collisions per second so equilibrium is reached faster.
2
3
4
5
