Reactions Yr 9
- 1.
Which of the following is a word equation?
- A.
Sodium oxide → sodium + oxygen
- B.
Sodium oxide decomposes to form sodium and oxygen
- C.
Na2O → Na + O2
- D.
2Na2O → 4Na + O2
Correct Answer
A. Sodium oxide → sodium + oxygen -
- 2.
In an exothermic reaction, heat is
- A.
Absorbed
- B.
Released
- C.
Destroyed
- D.
Conserved
Correct Answer
B. Released -
- 3.
Each of the substances to the left of the arrow in a chemical equation is a
- A.
Catalyst
- B.
Product
- C.
Reactant
- D.
Coefficient
Correct Answer
C. Reactant -
- 4.
What type of reaction is the following?CH4 + 2O2 → CO2 + 2H2O
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
- E.
Combustion
Correct Answer
E. Combustion -
- 5.
What coefficients would be added to balance the following equation?Fe + O2 → Fe2O3
- A.
2, 3, 1
- B.
4, 3, 2
- C.
It is already balanced
- D.
You wouldn't add a coefficient you would just change the subscripts
Correct Answer
B. 4, 3, 2 -
- 6.
What coefficients would balance the following equation?Sr + H2O → Sr(OH)2 + H2
- A.
1, 4, 2, 2
- B.
2, 4, 2, 4
- C.
1, 2, 1, 1
- D.
It is already balanced
Correct Answer
C. 1, 2, 1, 1 -
- 7.
Which of the following is NOT an observable clue that a chemical reaction has occurred?
- A.
Release of a gas
- B.
Odor change
- C.
Precipitate formation
- D.
Mixing two reactants
Correct Answer
D. Mixing two reactants -
- 8.
In a chemical reaction, the total mass of the substances before the reaction compared to the total mass of the substances after the reaction is
- A.
Usually smaller
- B.
Usually greater
- C.
Equal
- D.
Sometimes greater, sometimes smaller
Correct Answer
C. Equal -
- 9.
In a combustion reaction between a hydrocarbon and oxygen, the products are always?
- A.
A synthesis reaction
- B.
Carbon dioxide and water
- C.
Oxygen
- D.
Hydrogen, carbon and oxygen
Correct Answer
B. Carbon dioxide and water -
- 10.
In a combustion reaction, ______________ is always one of the reactants.
- A.
O
- B.
O2
- C.
CO2
- D.
H2O
Correct Answer
B. O2 -
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Current Version
-
May 26, 2014Quiz Edited by
ProProfs Editorial Team -
May 25, 2014Quiz Created by
Nickapo
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