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

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

Exam code: 9701

2 hours19 questions

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11 mark

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

    Choose your answer

    21 mark

    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)

    Choose your answer

    31 mark

    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)

    Choose your answer

    41 mark

    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

    Choose your answer

    51 mark

    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

    Choose your answer

    11 mark

    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

    Choose your answer

    21 mark

    The diagram below shows the skeletal formula of phenazine.

    yQO~lJkJ_image-1

    What is the empirical formula of phenazine?

    • C6H6N

    • C12H8N2

    • C6H4N

    • C12H12N2

    Choose your answer

    31 mark

    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

    Choose your answer

    1
    Sme Calculator    1 mark

    An 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

    Choose your answer

    2
    Sme Calculator    1 mark

    A compound has the composition by mass:

    H, 5.00%;    N, 35.00%;   O, 60.00%.

    Which compound has this composition?

    • HNO3 

    • NH4NO3 

    • HNO2 

    • NH2OH

    Choose your answer

    3
    Sme Calculator    1 mark

    A 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

    Choose your answer