PAG 1.3 – Determination of the formula for magnesium oxide

Last updated: 11/03/2020

OCR-A A-Level Chemistry Compounds, formulae and equations PAG 1.3 – Determination of the formula for magnesium oxide

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Question 1 of 24

1. Question
Which of the following compounds form when magnesium reacts with oxygen?
- Magnesium oxide
- Magnesium dioxide
- Magnesium sulfide
- Magnesium chloride
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Question 2 of 24

2. Question
What state is magnesium in?
- Solid
- Liquid
- Aqueous
- Gaseous
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Question 3 of 24

3. Question
How many decimal places should the balance that is being used to?
- 2
- 1
- 3
- 4
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Question 4 of 24

4. Question
What piece of safety equipment should be worn throughout this experiment?
- Goggles
- Gloves
- Face mask
- Lab coat
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Question 5 of 24

5. Question
Which of the following should be measured?
- Mass of the mat
- Mass of the crucible and lid
- Mass of bunsen burner
- Mass of beaker
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Question 6 of 24

6. Question
What should be done to ensure the magnesium fits in the crucible and lid?
- Coil it
- Cut it
- Melt it
- Use half of the amount
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Question 7 of 24

7. Question
How long should the magnesium be heated for?
- 5 minutes
- 3 minutes
- 10 minutes
- 20 minutes
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Question 8 of 24

8. Question
What should be used to break the residue of magnesium oxide?
- Tongs
- Metal spoon
- Splint
- Knife
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Question 9 of 24

9. Question
The mass of the crucible and lid is 24.75 grams, when it contains the magnesium the mass is 25.45 grams and when it contains the magnesium oxide the mass is 25.85 grams. What is the mass of magnesium?
- 0.70 grams
- 0.40 grams
- 1.10 grams
- 1.15 grams
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Question 10 of 24

10. Question
The mass of the crucible and lid is 24.75 grams, when it contains the magnesium the mass is 25.45 grams and when it contains the magnesium oxide the mass is 25.85 grams. What is the mass of oxygen?
- 0.40 grams
- 1.10 grams
- 0.70 grams
- 1.15 grams
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Question 11 of 24

11. Question
What are the units for mass?
- g
- mol
- J
- K
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Question 12 of 24

12. Question
What is the ratio between magnesium and oxygen?
- 1 : 1
- 2 : 3
- 2 : 1
- 1 : 3
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Question 13 of 24

13. Question
What is the Mr of oxygen?
- 16
- 14
- 32
- 24.3
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Question 14 of 24

14. Question
What is the Mr of magnesium?
- 24.3
- 14
- 32
- 16
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Question 15 of 24

15. Question
What is the number of moles of oxygen for this reaction?
- 0.0250 mol
- 0.0045 mol
- 0.0288 mol
- 0.0345 mol
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Question 16 of 24

16. Question
What is the number of moles of magnesium for this reaction?
- 0.0288 mol
- 0.0045 mol
- 0.0250 mol
- 0.0345 mol
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Question 17 of 24

17. Question
What are the number of moles measured in?
- mol
- J
- g
- n
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Question 18 of 24

18. Question
What is the empirical formula for magnesium oxide?
- $MgO$
- $Mg_2O$
- $MgO_2$
- $MgO_3$
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Question 19 of 24

19. Question
When the magnesium was first heated, why was the lid raised slightly?
- To allow oxygen to enter
- To allow more air
- To ensure incomplete combustion to take place
- To allow carbon dioxide to escape
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Question 20 of 24

20. Question
Why was the magnesium oxide broken up?
- To ensure it fully reacts with oxygen
- To increase surface area
- To stop the limiting factors
- To ensure it partially reacts with oxygen
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Question 21 of 24

21. Question
Why does the magnesium react with oxygen rather than nitrogen?
- As oxygen it more reactive
- As nitrogen is more reactive
- As there is not enough nitrogen available
- As there is more oxygen
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Question 22 of 24

22. Question
What is the empirical formula for magnesium nitrate?
- $Mg_3N_2$
- $MgN_2$
- $Mg_2N_3$
- $Mg_2N_2$
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Question 23 of 24

23. Question
What is the ratio between the amount of magnesium to oxygen?
- 3 : 2
- 2 : 3
- 3 : 1
- 2 : 1
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Question 24 of 24

24. Question
Where can the relative atomic mass of elements be found?
- On the periodic table
- By weighing elements
- In the data sheet
- Online
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