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- 1. Multiple Choice
Which of the following is true regarding the law of conservation of mass?
It dictates that the number of molecules on each side of a chemical equation must be the same.
It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.
It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed.
It does not apply to chemical reactions.
- 2. Multiple Choice
Which of the following may indicate that a chemical reaction has occured?
release of energy as light
a color change
gas bubble formation
all of these
- 3. Multiple Choice
Which of the following is a product in the reaction described by the word equation: iron + copper(II) sulfate --> iron(II) sulfate + copper
iron(II) sulfate
copper
iron
two of these are correct
- 4. Multiple Choice
What does CH4 represent in the balanced chemical equation: C + 2 H2 --> CH4
1 atom CH4
5 atoms CH4
1 molecule CH4
1 g CH4
- 5. Multiple Choice
Which of the following is NOT true regarding a properly written chemical equation?
It must be balanced.
It must contain proper chemical formulas.
It must show the formation of a precipitate or a gas.
It should represent known data.
- 6. Multiple Choice
In a chemical equation, the formula of a substance in water solution is followed by the symbol
(l)
(s)
(g)
(aq)
- 7. Multiple Choice
4
15
18
33
- 8. Multiple Choice
1, 1, 1, 1
1, 2, 2, 1
2, 1, 2, 1
2, 1, 1, 2
- 9. Multiple Choice
What type of chemical reaction results in the formation of a single product?
combustion
synthesis
decomposition
displacement
- 10. Multiple Choice
Which of the following is a product that can be formed by double displacement reactions?
gas
precipitate
water
all of these
- 11. Multiple Choice
Which of the following is NOT an example of a possible type of displacement reaction?
displacement of the metal in a compound by another metal
displacement of the halogen in a compound by another halogen
displacement of the hydrogen in water by a metal species
displacement of the hydrogen in water by a halogen
- 12. Multiple Choice
Zn
H
S
O
- 13. Multiple Choice
Which of the following equations represents a decomposition reaction?
- 14. Multiple Choice
double displacement reaction
synthesis reaction
decomposition reaction
combustion reaction
- 15. Multiple Choice
double displacement reaction
synthesis reaction
decomposition reaction
combustion reaction
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