Syllabus Edition
First teaching 2023
First exams 2025
When the following equation is balanced correctly, using the smallest whole number coefficients, which row represents the coefficients?
__ Mg3N2 (s) + __H2O (l) → __Mg(OH)2 (aq) + __NH3 (aq)
|
Mg3N2 |
H2O |
Mg(OH)2 |
NH3 |
|
|
A |
1 |
6 |
3 |
2 |
|
B |
1 |
3 |
3 |
1 |
|
C |
2 |
6 |
2 |
2 |
|
D |
2 |
6 |
3 |
2 |
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Which one of the following is the correct net ionic equation for the reaction (if one occurs) between CaCl2 and AgNO3?
Ca2+ (aq) + 2AgNO3 (aq) → 2Ag+ (s) + Ca(NO3)2 (aq)
CaCl2 (aq) + 2Ag+ (aq) → 2AgCl (s) + Ca2+ (aq)
Ca2+ (aq) + 2NO3- (aq) → Ca(NO3)2 (aq)
Ag+ (aq) + Cl- (aq) → AgCl (s)
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Which one of the following is the correct net ionic equation for the reaction (if one occurs) between NaC2H3O2 (aq) and HCl (aq)?
C2H3O2- (aq) + HCl (aq) → CCl- (aq) + 2H2 (aq) + CO2 (aq)
C2H3O2- (aq) + H+ (aq) → HC2H3O2 (aq)
Na+ (aq) + Cl- (aq) → NaCl (aq)
NaC2H3O2 (aq) + H+ (aq) → HC2H3O2 (aq) + Na+ (aq)
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Use of the data booklet is relevant to this question.
A compound was found to be 52.2% by weight carbon, 13.0% hydrogen and 34.8% oxygen.
What is the empirical formula of this compound?
C2H4O2
C4H13O2
C2H6O
C6H2O
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Use of the data booklet is relevant to this question.
A sample of hydrated calcium sulfate, CaSO4∙xH2O, has a relative formula mass of 172.2
What is the value of x?
1
2
3
4
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1 markAn organic compound has the composition by mass:
C, 53.33 %; H, 11.11%; O, 35.56%.
What is the empirical formula of the organic compound?
C4H8O2
C4H10O2
C2H4O
C2H5O
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1 markA compound has the composition by mass:
H, 5.00%; N, 35.00%; O, 60.00%.
Which compound has this composition?
HNO3
NH4NO3
HNO2
NH2OH
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1 markA sample of a compound M contains 1.46 g of carbon, 0.482 g of hydrogen and 1.69 g of nitrogen.
What is the empirical formula of M?
CH2N
C4HN4
CH4N
C2H4N
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Use of the data booklet is relevant to this question
A hydrated carbonate of an unknown Group 1 metal has the formula X2CO3∙10H2O and is found to have a relative formula mass of 286.
What is the group 1 metal?
Rb
K
Na
Li
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The diagram below shows the skeletal formula of phenazine.
What is the empirical formula of phenazine?
C6H6N
C12H8N2
C6H4N
C12H12N2
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Use of the data booklet is relevant to this question.
An additive in leaded petrol is composed of lead, carbon and hydrogen only. The compound contains 6.19% hydrogen and 29.7% carbon by mass.
What is the value of x in the empirical formula PbC8Hx?
6
5
20
16
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