A LevelChemistryCambridge (CIE)Exam Questions2. Atoms, Molecules & StoichiometryFormulas

Formulas (Cambridge (CIE) A Level Chemistry): Exam Questions

Exam code: 9701

2 hours20 questions

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1
1 mark

The equation for a reaction is shown.

Mg3N2 (s) + H2O (l) → Mg(OH)2 (aq) + NH3 (aq)

Which row gives the smallest whole-number coefficients required to balance the equation?

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

    Choose your answer

    2
    1 mark

    Which ionic equation represents the reaction between aqueous calcium chloride and aqueous silver nitrate?

    • 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)

    Choose your answer

    3
    1 mark

    Which ionic equation represents the reaction between aqueous sodium ethanoate and aqueous hydrochloric acid?

    • CH3CO2- (aq) + HCl (aq) → CH3CO2H (aq) + Cl- (aq)

    • CH3CO2- (aq) + H+ (aq) → CH3CO2H (aq)

    • Na+ (aq) + Cl- (aq) → NaCl (aq)

    • CH3CO2Na (aq) + H+ (aq) → CH3CO2H (aq) + Na+ (aq)

    Choose your answer

    4
    1 mark

    A compound contains 52.2% carbon, 13.0% hydrogen and 34.8% oxygen by mass. What is the empirical formula of this compound?

    • CH2O

    • C4H13O2

    • C2H6O

    • C6H2O

    Choose your answer

    5
    1 mark

    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

    Choose your answer

    1
    1 mark

    A hydrated carbonate of an unknown Group 1 metal, X, has the formula X2CO3∙10H2O and a relative formula mass of 286.

    What is the identity of X?

    • Li

    • Na

    • K

    • Rb

    Choose your answer

    2
    1 mark

    The skeletal formula of phenazine is shown.

    Skeletal formula of phenazine

    What is the empirical formula of phenazine?

    • C6H4N

    • C6H6N

    • C12H8N2

    • C12H12N2

    Choose your answer

    3
    1 mark

    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?

    • 5

    • 6

    • 16

    • 20

    Choose your answer

    4
    1 mark

    Hydrated copper(II) sulfate, CuSO4∙xH2O, has a relative formula mass of 231.6.

    What is the value of x?

    • 2

    • 3

    • 4

    • 5

    Choose your answer

    1
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    1 mark

    An organic compound has the following composition by mass: C, 53.33%; H, 11.11%; O, 35.56%.

    What is the empirical formula of the compound?

    • C2H4O

    • C2H5O

    • C4H8O2

    • C4H10O2

    Choose your answer

    2
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    1 mark

    A compound has the following composition by mass: H, 5.00%; N, 35.00%; O, 60.00%.

    What is the identity of the compound?

    • HNO2

    • HNO3

    • NH2OH

    • NH4NO3

    Choose your answer

    3
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    1 mark

    A sample of 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

    • CH4N

    • C2H4N

    • C4HN4

    Choose your answer