GCSE Chemistry – Percentage mass and atom economy
Learning Objectives
-I can calculate the percentage yield of a reaction
-I can calculate the atom economy of a reaction
-I can explain why a reaction may not give the expected yield
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Question 1 of 22
1. Question
What is the definition of the yield of a reaction?
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Question 2 of 22
2. Question
What is the definition of percentage yield?
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Question 3 of 22
3. Question
What is the equation for percentage yield?
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Question 4 of 22
4. Question
0.0345 grams of hydrochloric acid is reacted with 0.05 grams of ethene. 0.0022 grams of ethyl chloride is obtained. What is the percentage yield of ethyl chloride? Leave your answer to one decimal place.
HCl(aq) + C_2H_4(l) -> C_2H_5Cl(l)
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Question 5 of 22
5. Question
0.56 grams of salicylic acid, C_7H_6O_3, is reacted with 0.39 grams of ethanoyl chloride, C_2H_3OCl. 0.02 grams of aspirin is obtained. What is the percentage yield of aspirin, C_9H_8O_4? Leave your answer to one decimal place.
C_7H_6O_3(aq) + C_2H_3OCl(aq) -> C_9H_8O_4(aq) + HCl(aq)
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Question 6 of 22
6. Question
What is the definition of atom economy?
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Question 7 of 22
7. Question
What should be used when calculating atom economy?
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Question 8 of 22
8. Question
What is the symbol for relative formula mass?
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Question 9 of 22
9. Question
What is the equation for atom economy?
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Question 10 of 22
10. Question
If a reaction only has one product, what will the atom economy be?
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Question 11 of 22
11. Question
What is the atom economy of water in the following reaction?
CH_4(g) + 2O_2(g) -> CO_2(g) + 2H_2O(l)
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Question 12 of 22
12. Question
What is the atom economy of water in the following reaction?
2H_2(g) + O_2(g) -> 2H_2O(l)
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Question 13 of 22
13. Question
What is the atom economy of hydrogen in the following reaction? Leave your answer to one decimal place.
C_3H_8(g) -> C_3H_4(g) + 2H_2(g)
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Question 14 of 22
14. Question
What is the atom economy of sodium chloride in the following reaction?
2Na(s) + Cl_2(g) -> 2NaCl(s)
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Question 15 of 22
15. Question
What is the atom economy of copper nitrate, Cu(NO_3)_2, in the following reaction? Leave your answer to one decimal place.
CuCl_2(aq) + 2AgNO_3(aq) -> Cu(NO_3)_2(aq) + 2AgCl(s)
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Question 16 of 22
16. Question
What is the atom economy of fluorine in the following reaction? Leave your answer to one decimal place.Â
CaF_2(s) + Br_2(l) -> CaBr_2(s) + F_2(g)
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Question 17 of 22
17. Question
What is the atom economy of iron oxide, Fe_2O_3, in the following reaction?
4Fe(s) + 3O_2(aq) -> 2Fe_2O_3(s)
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Question 18 of 22
18. Question
Which of the following is a reason why a reaction may not produce a 100% yield?
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Question 19 of 22
19. Question
Which of the following is a reason why a reaction may not produce a 100% yield?
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Question 20 of 22
20. Question
Which of the following is a reason why a reaction may not produce a 100% yield?
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Question 21 of 22
21. Question
Which of the following is a reason why a reaction may not produce a 100% yield?
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Question 22 of 22
22. Question
Which of the following is a reason why a reaction may not produce a 100% yield?
