The Chemical Reaction - Quiz -
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Questions and Answers
- 1.
Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3 What constitutes this reaction?
- A.
Decomposition
- B.
Combustion
- C.
Double displacement
- D.
Synthesis
Correct Answer
C. Double displacementExplanation
This reaction is a double displacement reaction because the cations and anions in the reactants exchange places to form new compounds. The lead (Pb) cation from Pb(NO3)2 combines with the iodide (I) anion from KI to form PbI2, while the potassium (K) cation from KI combines with the nitrate (NO3) anion from Pb(NO3)2 to form KNO3.Rate this question:
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- 2.
In a chemical reaction, a hydrocarbon compound reacts with the diatomic element oxygen. What type of reaction is this?
- A.
Single replacement
- B.
Combustion
- C.
Formation
- D.
Double replacement
Correct Answer
B. CombustionExplanation
This reaction is called combustion because it involves the reaction of a hydrocarbon compound with oxygen, resulting in the release of heat and light energy. Combustion reactions typically produce carbon dioxide and water as products.Rate this question:
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- 3.
Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or combustion reaction? C10H8 + 12O2 → 10CO2 + 4H2O
- A.
Single replacement
- B.
Combustion
- C.
Synthesis
- D.
Decomposition
Correct Answer
B. CombustionExplanation
The given reaction involves the combustion of C10H8 (a hydrocarbon) with oxygen to produce carbon dioxide (CO2) and water (H2O). Combustion reactions typically involve the reaction of a hydrocarbon with oxygen to produce carbon dioxide and water as the main products. Therefore, the correct answer is combustion.Rate this question:
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- 4.
Which of the following represents a chemically balanced decomposition reaction of nickel (III) oxide into its elements?
- A.
Ni2O3 + H2O2 → 2Ni + 3O2 + H2
- B.
2Ni3O2 → 4Ni + 3O2
- C.
2Ni2O3 → 4Ni + 3O2
- D.
2NiO → 2Ni + O2
Correct Answer
C. 2Ni2O3 → 4Ni + 3O2Explanation
The correct answer is 2Ni2O3 → 4Ni + 3O2. This is a balanced decomposition reaction because it shows that two molecules of nickel (III) oxide (Ni2O3) decompose into four atoms of nickel (Ni) and three molecules of oxygen gas (O2). The coefficients in the equation represent the stoichiometric ratios needed to balance the number of atoms on both sides of the reaction.Rate this question:
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- 5.
You can tell a chemical reaction because it always produces …
- A.
A different substance
- B.
Reactants
- C.
A change of state
- D.
Water
Correct Answer
A. A different substanceExplanation
A chemical reaction can be identified by the production of a different substance. This means that the reactants undergo a transformation and form new products with different properties. This change in substance is a characteristic feature of a chemical reaction, distinguishing it from physical changes or other processes.Rate this question:
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- 6.
Which one of the following is a chemical equation?
- A.
Ice + heat --> water
- B.
Iron + oxygen --> rust
- C.
CO2
- D.
C + O2 --> CO2
Correct Answer
D. C + O2 --> CO2Explanation
The correct answer is C + O2 --> CO2. This is a chemical equation because it represents a chemical reaction where carbon (C) reacts with oxygen (O2) to form carbon dioxide (CO2). The arrow indicates the direction of the reaction, with the reactants (C and O2) on the left side and the product (CO2) on the right side of the arrow.Rate this question:
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- 7.
BaCO3 --> BaO + CO2
- A.
Synthesis reaction
- B.
Decomposition reaction
- C.
Single replacement reaction
- D.
Double replacement reaction
- E.
Combustion reaction
Correct Answer
B. Decomposition reactionExplanation
The given reaction shows the decomposition of BaCO3 into BaO and CO2. In a decomposition reaction, a compound breaks down into two or more simpler substances. Here, BaCO3 breaks down into BaO (barium oxide) and CO2 (carbon dioxide).Rate this question:
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- 8.
What is the product of neutralization?
- A.
Sugar
- B.
Salt
- C.
Water
- D.
Salt + water
Correct Answer
D. Salt + waterExplanation
Neutralization is a chemical reaction between an acid and a base, resulting in the formation of a salt and water. In this case, the product of neutralization is salt and water. The acid and base react with each other, causing the formation of a salt compound and water molecules. Therefore, the correct answer is salt + water.Rate this question:
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- 9.
C2H5OH + 3 O2 à 2 CO2 + 3H2O Combustion
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given equation represents the combustion of ethanol (C2H5OH). In this reaction, ethanol reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This is a combustion reaction because it involves the reaction of a fuel (ethanol) with oxygen to release energy in the form of heat and light. Therefore, the statement "True" is correct.Rate this question:
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- 10.
9) H2SO4 + 2NaOH à Na2SO4 + 2H2O Decomposition
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given equation represents a neutralization reaction, not a decomposition reaction. In a neutralization reaction, an acid (H2SO4) reacts with a base (NaOH) to form a salt (Na2SO4) and water (H2O). Decomposition reactions involve the breakdown of a single compound into two or more simpler substances. Therefore, the correct answer is False.Rate this question:
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- 11.
Mg + HCl à MgCl2 + H2 Single replacement
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2). This is an example of a single replacement reaction, where one element (in this case, magnesium) replaces another element (hydrogen) in a compound (HCl). Therefore, the statement "True" is correct.Rate this question:
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- 12.
Fe (II) + CuSO4 à FeSO4 + Cu Single replacement
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because it correctly describes a single replacement reaction between iron (II) and copper sulfate. In this reaction, iron (II) replaces copper in copper sulfate, resulting in the formation of iron sulfate and copper. This type of reaction is a common example of a single replacement reaction, where one element replaces another element in a compound.Rate this question:
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- 13.
Na2SO4 + BaCl2 à 2NaCl + BaSO4 Double replacement
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because it correctly describes the reaction between sodium sulfate (Na2SO4) and barium chloride (BaCl2) as a double replacement reaction. In this type of reaction, the cations and anions of two compounds switch places to form two new compounds. In this case, sodium chloride (NaCl) and barium sulfate (BaSO4) are formed.Rate this question:
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- 14.
2 Na(OH) à Na2O + H2O Double replacement
- A.
True
- B.
False
Correct Answer
B. False -
- 15.
Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or combustion reaction? C10H8 + 12O2 → 10CO2 + 4H2O
- A.
Single replacement
- B.
Combustion
- C.
Synthesis
- D.
Decomposition
Correct Answer
B. CombustionExplanation
The given reaction involves the combustion of C10H8 (a hydrocarbon) with oxygen to produce carbon dioxide (CO2) and water (H2O). Combustion reactions occur when a substance reacts with oxygen, usually producing heat and light. In this case, the hydrocarbon is being oxidized by oxygen to form carbon dioxide and water. Therefore, the correct answer is combustion.Rate this question:
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- 16.
Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or combustion reaction? C10H8 + 12O2 → 10CO2 + 4H2O
- A.
Single replacement
- B.
Combustion
- C.
Synthesis
- D.
Decomposition
Correct Answer
B. CombustionExplanation
The given reaction involves the reaction of C10H8 (a hydrocarbon) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This type of reaction is known as combustion. Combustion reactions typically involve the reaction of a fuel (in this case, C10H8) with oxygen to produce carbon dioxide and water.Rate this question:
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- 17.
Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or combustion reaction? C10H8 + 12O2 → 10CO2 + 4H2O
- A.
Single replacement
- B.
Combustion
- C.
Synthesis
- D.
Decomposition
Correct Answer
B. CombustionExplanation
The given reaction involves the combustion of C10H8 (a hydrocarbon) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). Combustion reactions typically involve the reaction of a fuel (in this case, C10H8) with oxygen to produce carbon dioxide and water. Therefore, the correct answer is combustion.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Dec 28, 2012Quiz Created by
Alnagar
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