Thermal decomposition of carbonates
7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS1-2 · England: KS3 Chemistry: Chemical reactions
Name
Date
Score/ 16
Question 1
Calcium carbonate is heated strongly and breaks down. What are the products?
- A. calcium + oxygen + carbon
- B. calcium oxide + oxygen
- C. calcium + carbon dioxide
- D. calcium oxide + carbon dioxide
Question 2
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 10 g of calcium carbonate, in g?
Answerg
Question 3
Green copper carbonate is heated and turns black. What is the black solid?
- A. carbon
- B. copper sulfate
- C. copper
- D. copper oxide
Question 4
Calcium carbonate is heated strongly and breaks down. What are the products?
- A. calcium hydroxide + water
- B. calcium oxide + oxygen
- C. calcium oxide + carbon dioxide
- D. calcium + oxygen + carbon
Question 5
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 6
Green copper carbonate is heated and turns black. What is the black solid?
- A. copper oxide
- B. copper
- C. copper sulfate
- D. carbon
Question 7
Copper carbonate is heated strongly and breaks down. What are the products?
- A. copper hydroxide + water
- B. copper + carbon dioxide
- C. copper + oxygen + carbon
- D. copper oxide + carbon dioxide
Question 8
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 10 g of calcium carbonate, in g?
Answerg
Question 9
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 10
Zinc carbonate is heated strongly and breaks down. What are the products?
- A. zinc oxide + oxygen
- B. zinc + carbon dioxide
- C. zinc oxide + carbon dioxide
- D. zinc hydroxide + water
Question 11
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?
Answerg
Question 12
Making cement is responsible for a large share of global CO₂ emissions. Why?
- A. Cement is made from coal
- B. Concrete gives off CO₂ forever
- C. Cement absorbs oxygen
- D. Heating limestone releases CO₂, and burning fuel to heat kilns releases more
Question 13
Magnesium carbonate is heated strongly and breaks down. What are the products?
- A. magnesium + carbon dioxide
- B. magnesium + oxygen + carbon
- C. magnesium oxide + carbon dioxide
- D. magnesium hydroxide + water
Question 14
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 15
How can you show that carbon dioxide is given off when a carbonate is heated?
- A. bubble the gas through limewater, which turns cloudy (milky)
- B. hold a lit splint in it, which gives a squeaky pop
- C. smell it
- D. hold a glowing splint in it, which relights
Question 16
Magnesium carbonate is heated strongly and breaks down. What are the products?
- A. magnesium + oxygen + carbon
- B. magnesium oxide + carbon dioxide
- C. magnesium hydroxide + water
- D. magnesium + carbon dioxide
Write your answers right on the page. · Free from eurekami.com