Thermal decomposition of carbonates
7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS1-2 · England: KS3 Chemistry: Chemical reactions
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Question 1
When 100 g of calcium carbonate is heated, it forms 56 g of calcium oxide and 44 g of carbon dioxide. What mass of carbon dioxide forms from 50 g of calcium carbonate, in g?
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Question 2
Why is limestone (calcium carbonate) heated in kilns?
- A. to make oxygen
- B. to make it heavier
- C. to make quicklime (calcium oxide) for cement and building
- D. to turn it into gold
Question 3
Copper carbonate is heated strongly and breaks down. What are the products?
- A. copper oxide + carbon dioxide
- B. copper + carbon dioxide
- C. copper + oxygen + carbon
- D. copper hydroxide + water
Question 4
When 100 g of calcium carbonate is heated, it forms 56 g of calcium oxide and 44 g of carbon dioxide. What mass of carbon dioxide forms from 5 g of calcium carbonate, in g?
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Question 5
Making cement is responsible for a large share of global CO₂ emissions. Why?
- A. Concrete gives off CO₂ forever
- B. Cement is made from coal
- C. Heating limestone releases CO₂, and burning fuel to heat kilns releases more
- D. Cement absorbs oxygen
Question 6
Magnesium carbonate is heated strongly and breaks down. What are the products?
- A. magnesium oxide + carbon dioxide
- B. magnesium + oxygen + carbon
- C. magnesium + carbon dioxide
- D. magnesium oxide + oxygen
Question 7
When 100 g of calcium carbonate is heated, it forms 56 g of calcium oxide and 44 g of carbon dioxide. What mass of carbon dioxide forms from 250 g of calcium carbonate, in g?
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Question 8
Why is limestone (calcium carbonate) heated in kilns?
- A. to make oxygen
- B. to turn it into gold
- C. to make it heavier
- D. to make quicklime (calcium oxide) for cement and building
Question 9
Magnesium carbonate is heated strongly and breaks down. What are the products?
- A. magnesium oxide + carbon dioxide
- B. magnesium + carbon dioxide
- C. magnesium oxide + oxygen
- D. magnesium hydroxide + water
Question 10
When 100 g of calcium carbonate is heated, it forms 56 g of calcium oxide and 44 g of carbon dioxide. What mass of carbon dioxide forms from 250 g of calcium carbonate, in g?
Answerg
Question 11
Why is limestone (calcium carbonate) heated in kilns?
- A. to make quicklime (calcium oxide) for cement and building
- B. to make it heavier
- C. to make oxygen
- D. to turn it into gold
Question 12
Calcium carbonate is heated strongly and breaks down. What are the products?
- A. calcium + carbon dioxide
- B. calcium + oxygen + carbon
- C. calcium oxide + carbon dioxide
- D. calcium hydroxide + water
Question 13
When 100 g of calcium carbonate is heated, it forms 56 g of calcium oxide and 44 g of carbon dioxide. What mass of carbon dioxide forms from 200 g of calcium carbonate, in g?
Answerg
Question 14
Why is limestone (calcium carbonate) heated in kilns?
- A. to make it heavier
- B. to make oxygen
- C. to turn it into gold
- D. to make quicklime (calcium oxide) for cement and building
Question 15
Zinc carbonate is heated strongly and breaks down. What are the products?
- A. zinc oxide + oxygen
- B. zinc + oxygen + carbon
- C. zinc + carbon dioxide
- D. zinc oxide + carbon dioxide
Question 16
When 100 g of calcium carbonate is heated, it forms 56 g of calcium oxide and 44 g of carbon dioxide. What mass of carbon dioxide forms from 200 g of calcium carbonate, in g?
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