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Science, Chemistry
10th -
12thgrade
Chemical Equations and Reaction Types
20 questions
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- 1. Multiple Choice
What observations could indicate a chemical reaction has taken place?
A change in color.
A change in temperature.
The evolution of a gas.
A change in odor.
A change in shape.
- 2. Multiple Choice
What type of chemical reaction would the following equation represent? 2H2 + N2 ↔ 2NH3
Synthesis
Decomposition
Single replacement
Double replacement
Combustion
- 3. Multiple Choice
Which type of reaction is represented by the following chemical equation? 2H2O2 → 2H2O + O2
Synthesis
Decomposition
Single replacement
Double replacement
Combustion
- 4. Multiple Choice
Which type of reaction is represented by the following chemical equation? 2HCl + Zn → ZnCl2 + H2
Synthesis
Decomposition
Single replacement
Double replacement
Oxidation-Reduction
- 5. Multiple Choice
Which type of reaction is represented by the following chemical equation? HCl + NaOH ↔ H2O + NaCl
Synthesis
Decomposition
Single replacement
Double replacement
Combustion
- 6. Multiple Choice
Which type of reaction is represented by the following chemical equation? CH4 + 2O2 → CO2 + 2H2O
Synthesis
Decomposition
Single replacement
Double replacement
Combustion
- 7. Multiple Choice
Balance the following equation: __ KCl + __ O2 → __ KClO3
4, 3, 3,
2, 2, 1
2, 3, 2
3, 4, 3
2, 2, 3
- 8. Multiple Choice
Balance the following equation: __NaF + __Cl2 → __NaCl + __F2
1, 2 ,1, 2
2, 1, 2, 1
2, 3, 2, 3
3, 2, 3, 2
- 9. Multiple Choice
A reactant is:
a material that takes no place in the reaction
the material formed in the reaction
the material being acted upon
the process of reacting
- 10. Multiple Choice
A product is:
a material that takes no place in the reaction
the material formed in the reaction
the material being acted upon
the process of reacting
- 11. Multiple Choice
An aqueous solution is referenced in a chemical reaction by:
(s)
(l)
(g)
(aq)
- 12. Multiple Choice
A balanced chemical equation assumes all of the following except:
the law of conservation of mass is true
the amount of reactants does not equal the amount of product(s)
matter can neither be created nor destroyed
equal numbers of atoms of each kind exist on both sides of the arrow
- 13. Multiple Choice
A student reacts zinc with excess hydrochloric acid, producing an aqueous salt and a gas. This gas is ignited, forming H2O. These two reaction are:
single replacement; synthesis
single replacement; combustion
double replacement; synthesis
double replacement; combustion
- 14. Multiple Choice
Concentrated hydrochloric acid and sodium hydroxide solutions react violently to form saltwater. This is an example of:
synthesis
decomposition
single replacement
double replacement
- 15. Multiple Choice
A student trips and scrapes their knee. Another student grabs a bottle of 3% hydrogen peroxide and applies an excess to the wound, resulting in the appearance of O2 bubbles at the site of injury. This is an example of:
synthesis
decomposition
single replacement
double replacement
- 16. Multiple Choice
A compound containing only carbon, hydrogen, and oxygen is found to be 48.38% C, 8.12% H, and 43.5% O by mass. What is its empirical formula?
CH2O
C2H4O
C3H6O2
C4H8O3
- 17. Multiple Choice
What is the percent P (by mass) in H3PO4?
30.6%
31.6%
32.6%
33.6%
- 18. Multiple Choice
What is the mass of Mg in 20.0 g of MgCO3?
5.25 g
5.76 g
5.93 g
6.01 g
- 19. Multiple Choice
What is the mass of O in 25.0 g of NH4NO3?
14.0 g
14.4 g
14.7 g
15.0 g
- 20. Multiple Choice
Balance the following equation: __PCl5 + __H2O → __H3PO4 + __ HCl
It's balanced
1, 4, 1, 5
1, 5, 1, 4
5, 1, 4, 1
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