Chemical Reactions
Review Quiz for Chemical Reactions Chapter Test
- 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
- 2.In an exothermic reaction, heat is
- A.
Absorbed
- B.
Released
- C.
Destroyed
- D.
Conserved
- 3.The breaking down of a compound into simpler substances is
- A.
Displacement
- B.
Synthesis
- C.
Decomposition
- D.
Endothermic
- 4.Each of the substances to the left of the arrow in a chemical equation is a
- A.
Catalyst
- B.
Product
- C.
Reactant
- D.
Coefficient
- 5.Numbers that precede (come before) symbols and formulas in a chemical equation are
- A.
Subscripts
- B.
Superscripts
- C.
Coefficients
- D.
Fractions
- 6.Which of the following types of reactions results in a single product?
- A.
A synthesis reaction
- B.
A decomposition reaction
- C.
A combustion reaction
- D.
A single replacement reaction
- E.
A double replacement reaction
- 7.What does → signify?
- A.
"and"
- B.
"yields/produces"
- C.
Catalyst
- D.
Add heat
- 8.What type of reaction is the following?CH4 + 2O2 → CO2 + 2H2O
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
- E.
Combustion
- 9.What type of reaction is the following?Cl2 + 2NaBr → 2NaCl + Br2
- A.
Synthesis
- B.
Decomposition
- C.
Single-replacement
- D.
Double-replacement
- E.
Combustion
- 10.
- A.
Synthesis
- B.
Decomposition
- C.
Single-replacement
- D.
Double-replacement
- E.
Combustion
- 11.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
- 12.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
- 13.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
- 14.An insoluble substance formed from two solutions is a
- A.
Reactant
- B.
Precipitate
- C.
Compound
- D.
Product
- 15.In a double-replacement reaction
- A.
The reactants are usually one metal and one nonmetal
- B.
One of the reactants is often water
- C.
The reactants are generally two ionic compounds
- D.
Energy is always produced
- 16.In order for the reaction F2 + NaCl → Cl2 + NaF to occur, which of the following must be true?
- A.
F must be above Na on the activity series
- B.
F must be above Cl on the activity series
- C.
Na must be above F on the activity series
- D.
Cl must be above F on the activity series
- 17.Which compound would decompose to form Mg and O2?
- A.
MgO2
- B.
MgO
- C.
Mg2O2
- D.
Mg and O2
- 18.Among the elements listed, which could replace all of the rest in a single replacement reaction?
- A.
Li
- B.
Mg
- C.
Cu
- D.
Ag
- E.
Ba
- 19.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
- 20.What does (aq) designate?
- 21.What does (g) stand for?
- 22.What would be the products of the following decomposition reaction?LiCl →
- A.
Li + Cl
- B.
LiCl
- C.
Li + Cl2
- D.
None of the above
- 23.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
- 24.In a combustion reaction, ______________ is always one of the reactants.
- A.
O
- B.
O2
- C.
CO2
- D.
H2O
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