Chemical Reaction Types / Reaction Rates
Take this quiz to learn more Chemical Reaction
Questions and Answers
- 1.
The process in which one or more substances change to make one or more new substances is called?
- A.
Chemical change
- B.
Chemical reaction
- C.
Chemical process
- D.
Chemical explosion
Correct Answer
B. Chemical reactionExplanation
A chemical reaction refers to the process in which one or more substances undergo a chemical change to form one or more new substances. This involves the breaking and forming of chemical bonds, resulting in a rearrangement of atoms and the creation of different chemical compounds. It is a fundamental concept in chemistry and is characterized by observable changes such as the release or absorption of energy, color change, formation of gas, or the production of a precipitate.Rate this question:
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- 2.
How can you tell when a chemical reaction is taking place? (check all that apply)
- A.
A gas forms
- B.
Substance turns to a liquid
- C.
Energy is given off
- D.
There is a color change
Correct Answer(s)
A. A gas forms
C. Energy is given off
D. There is a color changeExplanation
Reactions often have more than one sign. The more signs you see, the more likely a chemical reaction is taking place.Rate this question:
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- 3.
Is the chemical equation balanced? Na + Cl2 -------------------> NaCl
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
The chemical equation is not balanced because the number of atoms on both sides of the equation is not equal. On the left side, there is one sodium atom, while on the right side, there is only one chloride atom. To balance the equation, we need to add a coefficient of 2 in front of NaCl, so that there are 2 chloride atoms on the right side. The balanced equation would be: 2Na + Cl2 -> 2NaCl.Rate this question:
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- 4.
Is the chemical equation balanced? 3Mg + N2 -------------> Mg3N2
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
The chemical equation is balanced because the number of atoms on both sides of the equation is equal. On the left side, there are 3 magnesium (Mg) atoms and 1 nitrogen (N) molecule, which is composed of 2 nitrogen atoms. On the right side, there are 1 magnesium nitride (Mg3N2) compound, which contains 3 magnesium atoms and 2 nitrogen atoms. Therefore, the equation is balanced.Rate this question:
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- 5.
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
Correct Answer
A. A synthesis reactionExplanation
A synthesis reaction is a type of chemical reaction where two or more reactants combine to form a single product. This means that all the reactants come together to create a new compound or molecule. In other words, the reaction is the opposite of a decomposition reaction where a single compound breaks down into multiple products. Combustion reactions involve the reaction of a fuel with oxygen to produce carbon dioxide and water, so they do not result in a single product. Single replacement and double replacement reactions also involve the exchange of atoms or ions between reactants, leading to multiple products. Therefore, the correct answer is a synthesis reaction.Rate this question:
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- 6.
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 reactantsExplanation
Mixing two reactants is not an observable clue that a chemical reaction has occurred because the act of mixing alone does not indicate any changes in the substances involved. While the other options - release of a gas, odor change, and precipitate formation - all suggest that a chemical reaction has taken place, simply mixing two reactants does not provide any direct evidence of a reaction occurring.Rate this question:
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- 7.
The __________________________________________ says that mass cannot be created or destroyed.
Correct Answer
law of conservation of mass, law of conservation of matterExplanation
The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products. Similarly, the law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction. Both laws emphasize the principle that the total amount of mass or matter in a closed system remains constant.Rate this question:
- 8.
CO2(g) + H2O(l) → H2CO3(aq)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
A. SynthesisExplanation
The given chemical equation represents a synthesis reaction. In a synthesis reaction, two or more reactants combine to form a single product. In this case, carbon dioxide gas (CO2) and water (H2O) react to form carbonic acid (H2CO3) in aqueous form. This reaction follows the general form of A + B → AB, where CO2 and H2O combine to form H2CO3. Therefore, the correct answer is synthesis.Rate this question:
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- 9.
2 Na(s) + Cl2(g) → 2NaCl(s)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
A. SynthesisExplanation
The given chemical equation represents a synthesis reaction. In a synthesis reaction, two or more substances combine to form a single compound. In this case, sodium (Na) reacts with chlorine gas (Cl2) to produce sodium chloride (NaCl). The reactants, Na and Cl2, combine to form the product, NaCl. Therefore, the correct answer is synthesis.Rate this question:
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- 10.
Cl2(g) + 2NaBr(aq) → 2NaCl(aq) + Br2(l)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
C. Single replacementExplanation
The given chemical equation represents a single replacement reaction. In this reaction, chlorine gas (Cl2) reacts with sodium bromide (NaBr) to form sodium chloride (NaCl) and bromine liquid (Br2). The chlorine gas replaces the bromine in the sodium bromide compound, resulting in the formation of sodium chloride and bromine. This type of reaction is known as a single replacement reaction, where one element replaces another element in a compound.Rate this question:
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- 11.
2NaCl(l) → 2Na(s) + Cl2(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
B. DecompositionExplanation
The given chemical equation shows the breakdown of sodium chloride (NaCl) into sodium (Na) and chlorine gas (Cl2). This process is known as decomposition, as a single compound is broken down into two or more simpler substances.Rate this question:
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- 12.
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
C. Single replacementExplanation
The given chemical equation represents a single replacement reaction. In this type of reaction, one element replaces another element in a compound. In this case, zinc (Zn) replaces hydrogen (H) in hydrochloric acid (HCl) to form zinc chloride (ZnCl2) and hydrogen gas (H2). Therefore, the correct answer is single replacement.Rate this question:
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- 13.
2KClO3(s) → 2KCl(s) + 3O2(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
B. DecompositionExplanation
The given chemical equation shows the reaction of 2KClO3(s) decomposing into 2KCl(s) and 3O2(g). Decomposition reactions involve a single reactant breaking down into two or more products. In this case, the reactant KClO3 is breaking down into the products KCl and O2. Therefore, the correct answer is decomposition.Rate this question:
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- 14.
CaCO3(s) → CaO(s) + CO2(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
B. DecompositionExplanation
The given chemical equation represents the decomposition reaction of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2). In this reaction, a single compound breaks down into two or more simpler substances. Therefore, the correct answer is decomposition.Rate this question:
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- 15.
2Mg(s) + O2(g) → 2MgO(s)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
A. SynthesisExplanation
The given chemical equation shows the reaction between magnesium (Mg) and oxygen (O2) to form magnesium oxide (MgO). This reaction is a synthesis reaction because two or more substances (Mg and O2) combine to form a single compound (MgO).Rate this question:
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- 16.
Ba(NO3)2(aq) + K2SO4(aq) --> BaSO4(s) + 2KNO3(aq)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
D. Double replacementExplanation
The given chemical equation represents 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, the barium cation (Ba2+) from Ba(NO3)2 reacts with the sulfate anion (SO42-) from K2SO4 to form barium sulfate (BaSO4) and the nitrate anion (NO3-) from Ba(NO3)2 reacts with the potassium cation (K+) from K2SO4 to form potassium nitrate (KNO3). Therefore, the correct answer is double replacement.Rate this question:
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- 17.
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
C. Single replacementExplanation
The given reaction involves a single element (Fe) replacing another element (Cu) in a compound (CuSO4). This type of reaction is known as a single replacement reaction. In this reaction, the iron (Fe) replaces the copper (Cu) in the copper sulfate (CuSO4) compound, resulting in the formation of iron sulfate (FeSO4) and solid copper (Cu).Rate this question:
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- 18.
C(s) + O2(g) → CO2(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
A. SynthesisExplanation
The given chemical equation represents the synthesis reaction. In a synthesis reaction, two or more reactants combine to form a single product. In this case, the reactants are carbon (C) and oxygen gas (O2), and the product is carbon dioxide gas (CO2). Therefore, the correct answer is synthesis.Rate this question:
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- 19.
2P(s) + 3Cl2(g) → 2PCl3(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
A. SynthesisExplanation
The given chemical equation represents a synthesis reaction, which is a type of chemical reaction where two or more substances combine to form a new compound. In this case, two molecules of phosphorus (P) react with three molecules of chlorine (Cl2) to form two molecules of phosphorus trichloride (PCl3). The reaction involves the combination of elements to form a compound, making it a synthesis reaction.Rate this question:
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- 20.
H2SO4 → H2O(l) + SO3(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
B. DecompositionExplanation
The given chemical equation represents a decomposition reaction. In this reaction, a single compound, H2SO4, breaks down into two separate compounds, H2O(l) and SO3(g). Decomposition reactions involve the breakdown of a single compound into two or more simpler substances.Rate this question:
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- 21.
Ca(OH)2(s) → CaO(s) + H2O(g)
- A.
Synthesis
- B.
Decomposition
- C.
Single replacement
- D.
Double replacement
Correct Answer
B. DecompositionExplanation
The given chemical equation represents the decomposition reaction of calcium hydroxide (Ca(OH)2). In this reaction, calcium hydroxide breaks down into calcium oxide (CaO) and water vapor (H2O). This is a decomposition reaction because a single compound is breaking down into two or more simpler substances.Rate this question:
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- 22.
Which statement is true?
- A.
The higher the temperature the slower the reaction
- B.
The lower the temperature the faster the reaction
- C.
The higher the concentration the slower the reaction
- D.
The higher the concentration the faster the reaction.
Correct Answer
D. The higher the concentration the faster the reaction.Explanation
In chemical reactions, the rate of reaction is often influenced by the concentration of reactants. When the concentration of reactants is higher, there are more particles available to collide and react, leading to a faster reaction rate. This is because an increase in concentration increases the frequency of successful collisions between particles, which in turn increases the rate of the reaction. Therefore, the statement "The higher the concentration the faster the reaction" is true.Rate this question:
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- 23.
The breaking down of a compound into simpler substances is
- A.
Displacement
- B.
Synthesis
- C.
Decomposition
- D.
Endothermic
Correct Answer
C. DecompositionExplanation
Decomposition refers to the process of breaking down a compound into simpler substances. This can occur through various chemical reactions, such as heat, light, or the addition of a catalyst. During decomposition, the compound is effectively "disassembled" into its constituent elements or smaller compounds. This is the opposite of synthesis, where smaller substances combine to form a more complex compound. Displacement and endothermic are unrelated terms in this context.Rate this question:
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- 24.
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, 1Explanation
The given equation is not balanced because the number of atoms on each side of the equation is not equal. To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides. By assigning coefficients to each compound, we find that the correct coefficients are 1, 2, 1, 1. This ensures that there is one strontium atom, two hydrogen atoms, one oxygen atom, and one strontium hydroxide molecule on both sides of the equation.Rate this question:
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- 25.
Which has the greater surface area?
- A.
A sugar cube (one teaspoon if measured)
- B.
A teaspoon of powdered sugar
- C.
They both have the same surface area.
- D.
There is no way to answer this question.
Correct Answer
B. A teaspoon of powdered sugarExplanation
A teaspoon of powdered sugar has a greater surface area compared to a sugar cube. This is because the powdered sugar is finely ground and has a larger number of particles, resulting in a greater overall surface area. The sugar cube, on the other hand, has a solid structure with fewer exposed surfaces. Therefore, the teaspoon of powdered sugar has a larger surface area.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Jan 25, 2018Quiz Created by
Milton Harris
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