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Reactants, products and word equations

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS1-2, NGSS.MS-PS1-5 · England: KS3 Chemistry: Chemical reactions

Name

Date

Score/ 16

1
Question 1
Word equations: which statement is NOT true?
- A. Thermal decomposition breaks a substance down using heat.
- B. Burning metal makes it lighter because mass is lost.
- C. Incomplete combustion can produce carbon monoxide, a poisonous gas.
- D. Combustion is a reaction with oxygen.
2
Question 2
Complete the word equation: copper + oxygen → ___
- A. carbon dioxide
- B. copper carbonate
- C. copper oxide
- D. copper chloride
3
Question 3
Calcium carbonate is heated strongly: calcium carbonate → calcium oxide + ___
- A. water
- B. oxygen
- C. carbon dioxide
- D. hydrogen
4
Question 4
Word equations: which statement is NOT true?
- A. Combustion is a reaction with oxygen.
- B. Incomplete combustion can produce carbon monoxide, a poisonous gas.
- C. Thermal decomposition breaks a substance down using heat.
- D. Burning metal makes it lighter because mass is lost.
5
Question 5
Complete the word equation: iron + oxygen → ___
- A. iron chloride
- B. iron carbonate
- C. copper oxide
- D. iron oxide
6
Question 6
In the reaction "iron + sulfur → iron sulfide", what are the reactants?
- A. iron only
- B. sulfur and iron sulfide
- C. iron and sulfur
- D. iron sulfide
7
Question 7
Word equations: which statement is NOT true?
- A. Incomplete combustion can produce carbon monoxide, a poisonous gas.
- B. Reactants are written on the left of the arrow.
- C. Thermal decomposition breaks a substance down using heat.
- D. Products are the substances you start with.
8
Question 8
Complete the word equation: zinc + oxygen → ___
- A. zinc carbonate
- B. zinc oxide
- C. iron oxide
- D. carbon dioxide
9
Question 9
What is needed for fuels to burn?
- A. carbon dioxide
- B. nitrogen only
- C. oxygen and enough heat
- D. water and light
10
Question 10
Word equations: which statement is NOT true?
- A. Combustion is a reaction with oxygen.
- B. Reactants are written on the left of the arrow.
- C. Burning metal makes it lighter because mass is lost.
- D. Incomplete combustion can produce carbon monoxide, a poisonous gas.
11
Question 11
Complete the word equation: zinc + oxygen → ___
- A. zinc oxide
- B. magnesium oxide
- C. zinc carbonate
- D. carbon dioxide
12
Question 12
Calcium carbonate is heated strongly: calcium carbonate → calcium oxide + ___
- A. water
- B. hydrogen
- C. oxygen
- D. carbon dioxide
13
Question 13
Word equations: which statement is NOT true?
- A. Combustion is a reaction with oxygen.
- B. The arrow in a word equation means "equals".
- C. Thermal decomposition breaks a substance down using heat.
- D. Incomplete combustion can produce carbon monoxide, a poisonous gas.
14
Question 14
Complete the word equation: copper + oxygen → ___
- A. iron oxide
- B. copper oxide
- C. copper chloride
- D. copper carbonate
15
Question 15
In the reaction "iron + sulfur → iron sulfide", what are the reactants?
- A. sulfur and iron sulfide
- B. iron only
- C. iron and sulfur
- D. iron sulfide
16
Question 16
Word equations: which statement is NOT true?
- A. Burning metal makes it lighter because mass is lost.
- B. Thermal decomposition breaks a substance down using heat.
- C. Combustion is a reaction with oxygen.
- D. Reactants are written on the left of the arrow.

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