National 5ChemistrySQAExam QuestionsChemical Changes & StructureFormulae & Reacting Quantities

Formulae & Reacting Quantities (SQA National 5 Chemistry): Exam Questions

Exam code: X813 75

10 mins10 questions
1
1 mark

Which of the following molecules contains three atoms?

  • Phosphorus trichloride

  • Magnesium chloride

  • Sodium fluoride

  • Carbon dioxide

Choose your answer

2
1 mark

Ammonium phosphate, (NH4)3PO4, has a gram formula mass of 149.

The percentage by mass of nitrogen in ammonium phosphate is equal to

  • 14 over 149 cross times 100

  • 42 over 149 cross times 100

  • 149 over 14 cross times 100

  • 149 over 42 cross times 100

Choose your answer

3
1 mark

What is the charge on the manganese ion in manganese dichromate, MnCr2O7?

You may wish to use the data booklet to help you.

  • 2+

  • 1+

  • 2-

  • 1-

Choose your answer

4
1 mark

2 Mg plus straight O subscript 2 rightwards arrow 2 MgO

How many moles of oxygen would be needed to react completely with 4 moles of magnesium?

  • 1

  • 2

  • 4

  • 8

Choose your answer

5
1 mark

Which of the following elements has the lowest gram formula mass?

  • Nitrogen

  • Oxygen

  • Fluorine

  • Neon

Choose your answer

6
1 mark

In which of the following compounds does the iron ion have a 3+ charge?

You may wish to use the data booklet to help you.

  • FeO

  • FeP

  • Fe(NO3)2

  • Fe3(PO4)2

Choose your answer

7
1 mark

Which solution contains the least number of moles of solute?

  • 100 cm3 of 1.00 mol l −1

  • 150 cm3 of 0.75 mol l −1

  • 200 cm3 of 0.60 mol l −1

  • 250 cm3 of 0.25 mol l −1

Choose your answer

8
1 mark

Which line in the table shows how the concentration of a solution changes when more solute or solvent is added?

Adding solute

Adding solvent

A

concentration decreases

concentration increases

B

concentration decreases

concentration decreases

C

concentration increases

concentration decreases

D

concentration increases

concentration increases

    Choose your answer

    9
    1 mark

    Ammonium nitrate, NH4NO3 , has a gram formula mass of 80.

    The percentage by mass of nitrogen in ammonium nitrate is equal to

    • 14 over 80 cross times 100

    • 28 over 80 cross times 100

    • 28 over 100 cross times 80

    • 80 over 28 cross times 100

    Choose your answer

    10
    1 mark

    0·1 mol of sodium hydroxide was dissolved in water and the solution made up to 250 cm3 .

    What is the concentration, in mol l-1 , of the sodium hydroxide solution?

    • 0·0004

    • 0·025

    • 0·4

    • 2·5

    Choose your answer