Chemical Equations And Reactions
This quiz is a review for the unit exam. If you do well on this, you will pass the exam.
- 1.
Write the balanced equation: Sodium hydroxide and chlorine gas yields sodium chloride, sodium hypochlorite, and water.
- 2.
After the correct formula for a reactant in an equation has been written, the -
- A.
Chemical formula cannot be altered
- B.
Subscripts of the formula are changed to balance the equation
- C.
Chemical symbols in the formula must appear only on the reactant side
- D.
Same chemical formula must be written on the product side of the equation
Correct Answer
A. Chemical formula cannot be alteredExplanation
Remember that if you alter the chemical formula, you have changed the substance.Rate this question:
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- 3.
Which equation represents a precipitation reaction?
- A.
Equation A
- B.
Equation B
- C.
Equation C
- D.
Equation D
Correct Answer
D. Equation DExplanation
A precipitation reaction is one that produces a solid. Look at the symbols for the products.Rate this question:
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- 4.
Which of the following reactions involves two or more substances combining to form a new compound?
- A.
Single-replacement reaction
- B.
Synthesis reaction
- C.
Decomposition reaction
- D.
Combustion reaction
Correct Answer
B. Synthesis reactionExplanation
The substances are combining to make something new. This is the definition of a synthesis reaction.Rate this question:
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- 5.
Which of the following reactions involves one element replacing an element in a compound that is from the same activity series?
- A.
Combustion reaction
- B.
Decomposition reaction
- C.
Single-replacement reaction
- D.
Double-replacement reaction
Correct Answer
C. Single-replacement reactionExplanation
If only one element is being replaced, it is a single-replacement reaction.Rate this question:
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- 6.
Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?
- A.
Synthesis reaction
- B.
Single-replacement reaction
- C.
Double-replacement reaction
- D.
Combustion reaction
Correct Answer
C. Double-replacement reactionExplanation
AX + BY --> AY + BXRate this question:
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- 7.
Which of the following reactions involves a single compound producing two or more simpler substances?
- A.
Synthesis reaction
- B.
Decomposition reaction
- C.
Combustion reaction
- D.
Double-replacement reaction
Correct Answer
B. Decomposition reactionExplanation
When you have a single substance breaking down into simpler substances, it is decomposing.Rate this question:
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- 8.
By predicting the outcome of the following reactants mixing together in an aqueous solution, what type of reaction will take place?
- A.
Double-replacement reaction
- B.
Synthesis reaction
- C.
Decomposition reaction
- D.
Single-replacement
Correct Answer
A. Double-replacement reactionExplanation
You can tell by looking at the reactants that this is set up as AX + BY --> . This indicates a double-replacement reaction.Rate this question:
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- 9.
When an acid decomposes, what are the products?
- A.
Non-metal oxides and a salt
- B.
Non-metal oxides and water
- C.
Metal oxides and oxygen
- D.
Metal oxides and peroxide
Correct Answer
B. Non-metal oxides and waterExplanation
H2SO4 --> SO3 + H2ORate this question:
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- 10.
Predict the outcome of the reaction where zinc metal is added to a solution of potassium chloride.
- A.
No reaction occurs
- B.
Gaseous zinc is formed
- C.
Potassium calcide forms
- D.
Zinc chloride forms
Correct Answer
A. No reaction occursExplanation
Zinc is below potassium in the Activity Series so it would not replace potassium.Rate this question:
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- 11.
Predict the products of this reaction.
- A.
Na2CO3
- B.
Na + CO3
- C.
NaCO2 + O2
- D.
NaC + O3
Correct Answer
A. Na2CO3Explanation
Sodium is the only metal, so there is no single-replacement reaction. Think about a balanced equation.Rate this question:
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- 12.
Which coefficients are required to correctly balance the equation?
- A.
1,2,3,2
- B.
2,5,4,2
- C.
2,4,5,2
- D.
2,3,5,2
Correct Answer
B. 2,5,4,2Explanation
Make sure each type of atom is equal on both sides.Rate this question:
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- 13.
According to the law of conservation of matter, the total mass of all the reacting substances is -
- A.
More than the mass of all the products
- B.
More than the total mass of all the products and reactants
- C.
Less than the total mass of all the products
- D.
Equal to the mass of all the products
Correct Answer
D. Equal to the mass of all the productsExplanation
Matter cannot be created or destroyed, it is conserved.Rate this question:
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- 14.
A student performing an investigation of chemical reactions mixes two aqueous solutions and observes a change in color. Color change is most indicative of which type of chemical reaction?
- A.
Neutralization
- B.
Precipitation
- C.
Oxidation-reduction
- D.
Acid-base
Correct Answer
C. Oxidation-reductionExplanation
Neutralization and acid-base are pretty much the same thing. There may not be any color change with this reaction. A precipitation reaction will turn cloudy, but not necessarily a color change. A color change usually indicates an oxidation-reduction reaction. Think about a nail rusting.Rate this question:
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- 15.
What would you observe during a precipitation reaction?
- A.
Gas bubbles are produced.
- B.
A solid settles out.
- C.
There is a color change.
- D.
The test tube warms.
Correct Answer
B. A solid settles out.Explanation
A precipitation reaction produces a solid.Rate this question:
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- 16.
Which equation represents a neutralization reaction?
- A.
Equation A
- B.
Equation B
- C.
Equation C
- D.
Equation D
Correct Answer
A. Equation AExplanation
A neutralization reaction involves and acid and a base.Rate this question:
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