Lesson Worksheet: Thermal Decomposition Science
In this worksheet, we will practice describing and giving examples of thermal decomposition reactions.
Q1:
Some of the following copper compounds can be thermally decomposed; others are thermally stable:
Of those that decompose, which product is common in all cases?
- A
- B
- C
- D
- E
Q2:
Malachite is an impure ore used to form copper(II) oxide. The production of copper(II) oxide involves roasting the malachite in a large furnace at high temperatures. What chemical must be present in malachite to form copper(II) oxide during the reactions that take place inside the furnace?
- ACopper(II) carbonate
- BCopper chloride
- CCopper(II) oxide
- DCopper metal
- ECopper sulfide
Q3:
Which of the following reactions is an example of a thermal decomposition?
- A
- B
- C
- D
- E
Q4:
Which of the following chemical equations shows the thermal decomposition of zinc carbonate?
- A
- B
- C
- D
- E
Q5:
Which of the following products is formed during the thermal decomposition of copper(II) carbonate?
- ACopper metal
- BCopper(II) oxide
- CWater
- DHydrogen
- ECarbon monoxide
Q6:
A student placed a small quantity of zinc carbonate into a test tube. She weighed the test tube and zinc carbonate and found their mass to be 55 g. She then heated the test tube strongly for 5 minutes. After the test tube had cooled down, she reweighed it and the remaining powder inside.
What is the new mass of the test tube and zinc compound?
- AMore than 55 g
- BLess than 55 g
- C55 g
Q7:
Which of the following statements is correct?
- AStatement 2
- BStatement 4
- CStatement 3
- DStatement 1
Q8:
A student heated a sample of lead carbonate in a test tube. He heated it until there was no further change, leaving a yellow solid in the test tube.
What type of chemical reaction occurred?
- ACombustion
- BOxidation
- CThermal decomposition
- DNeutralization
- EDisplacement
Which gas was produced during this chemical reaction?
- ACarbon monoxide
- BSulfur dioxide
- CSteam
- DOxygen
- ECarbon dioxide
What is the name of the yellow powder that remained in the test tube?
- ALead carbonate
- BLead nitrate
- CLead metal
- DLead chloride
- ELead oxide
What is the word equation for this reaction?
- A
- B
- C
- D
- E
Q9:
In the diagram, mercury oxide is being heated strongly to cause thermal decomposition. Which gas is being collected over water?
- ASteam
- BCarbon dioxide
- CSulfur dioxide
- DOxygen
- ECarbon monoxide
Q10:
The diagram shows the apparatus used to decompose a sample of lead carbonate.
What is the name of the liquid labeled X in the diagram, which is used to test for the presence of a gas given off during thermal decomposition?
- AHydrochloric acid
- BWater
- CAmmonia solution
- DLimestone water
- ELimewater
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