Chemical Dominoes - Activity 4 Quiz
Quiz on redox reactions
Questions and Answers
- 1.
1. Given the balanced ionic equation: Zn(s) + Cu2+(aq) à Zn2+(aq) + Cu(s) Which equation represents the oxidation half-reaction?
- A.
Cu2+(aq) --> Cu(s) +2e-
- B.
Cu2+(aq) + 2e- -->Cu(s)
- C.
Zn(s) + 2e- --> Zn2+(aq)
- D.
Zn(s) --> Zn2+(aq) + 2e-
Correct Answer
D. Zn(s) --> Zn2+(aq) + 2e-Explanation
The equation Zn(s) --> Zn2+(aq) + 2e- represents the oxidation half-reaction because it shows the loss of electrons from the zinc atoms (Zn(s) to Zn2+(aq)). In this reaction, zinc is being oxidized, which means it is losing electrons and increasing its oxidation state. The electrons released during this reaction are shown on the right side of the equation.Rate this question:
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- 2.
Electrons in a battery flow from
- A.
Positive to negative
- B.
Negative to positive
- C.
They don't flow
- D.
Cathode to anode
Correct Answer
B. Negative to positiveExplanation
In a battery, electrons flow from the negative terminal (cathode) to the positive terminal (anode). This flow is due to the difference in charge between the two terminals. Electrons are negatively charged particles, so they are attracted to the positive terminal and repelled by the negative terminal. As a result, they move from the negative terminal to the positive terminal, creating an electric current.Rate this question:
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- 3.
1. Given the redox reaction: Cr3+ + Al à Cr + Al3+ As the reaction takes place, there is a transfer of
- A.
Electrons from Al to Cr3+
- B.
Electrons from Cr3+ to Al
- C.
Protons from Al to Cr3+
- D.
Protons from Cr3+ to Al
Correct Answer
A. Electrons from Al to Cr3+Explanation
In the given redox reaction, Cr3+ is being reduced to Cr, which means it is gaining electrons. On the other hand, Al is being oxidized to Al3+, which means it is losing electrons. Therefore, there is a transfer of electrons from Al to Cr3+ during the reaction.Rate this question:
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- 4.
To stop a circuit from lighting, you must disrupt the flow of
- A.
Neutrons
- B.
Protons
- C.
Electrons
- D.
Moles
Correct Answer
C. ElectronsExplanation
To stop a circuit from lighting, you must disrupt the flow of electrons. Electrons are negatively charged particles that carry the electrical current in a circuit. By interrupting the flow of electrons, such as by opening a switch or breaking the circuit, the circuit will be unable to complete its path and the light will not turn on. Neutrons and protons are particles found in the nucleus of an atom and are not directly involved in the flow of electricity. Moles, on the other hand, are a unit of measurement for the amount of substance and have no relevance to circuitry.Rate this question:
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- 5.
The solid is _____________ and ___________ electrons.
- A.
Oxidized, gains
- B.
Oxidized, loses
- C.
Reduced, gains
- D.
Reduced, loses
Correct Answer
B. Oxidized, losesExplanation
In this question, the solid is undergoing a process called oxidation, which involves the loss of electrons. When a substance is oxidized, it loses electrons, resulting in a positive charge. Therefore, the correct answer is "oxidized, loses."Rate this question:
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- 6.
Metals will lose electrons to form ______________ ions.
- A.
Negative
- B.
Positive
- C.
Neutral
- D.
Equal
Correct Answer
B. PositiveExplanation
Metals have a tendency to lose electrons to achieve a stable electron configuration, which results in the formation of positive ions. This process is known as oxidation, where metals undergo oxidation by losing electrons. Therefore, the correct answer is positive.Rate this question:
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- 7.
In order for Hg and Pt to react, Hg will have to
- A.
Be the solid that is oxidized
- B.
The solid that is reduced
- C.
The aqueous that is oxidized
- D.
The aqueous that is reduced
Correct Answer
A. Be the solid that is oxidizedExplanation
Hg will have to be the solid that is oxidized because in a redox reaction, oxidation involves the loss of electrons, and the substance that is oxidized is called the reducing agent. Since Hg is being oxidized, it is losing electrons and acting as the reducing agent.Rate this question:
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- 8.
Ca2+ ions WILL react with
- A.
Magnesium(s)
- B.
Copper (s)
- C.
Potassium (s)
- D.
Silver (s)
Correct Answer
C. Potassium (s)Explanation
Ca2+ ions will react with potassium (s) because potassium is more reactive than calcium. In a reaction, calcium will lose two electrons to form Ca2+ ions, while potassium will lose one electron to form K+ ions. Since potassium has a higher reactivity, it will displace calcium in a reaction and form a compound with the calcium ions. This reaction is known as a displacement reaction.Rate this question:
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- 9.
Pb3+ + Al(s) --> Pb(s) + Al3+ Al is _____________.
- A.
Oxidized
- B.
Reduced
- C.
Neutral
- D.
Acidic
Correct Answer
A. OxidizedExplanation
In the given reaction, Pb3+ is reduced to Pb(s) while Al is oxidized to Al3+. This is because Pb3+ gains electrons and is reduced, while Al loses electrons and is oxidized. Therefore, the correct answer is oxidized.Rate this question:
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- 10.
Nickel (s) will react with
- A.
Lithium (aq)
- B.
Zinc (aq)
- C.
Iron (aq)
- D.
Mercury (aq)
Correct Answer
D. Mercury (aq)Explanation
Nickel is a less reactive metal compared to lithium, zinc, iron, and mercury. It will not react with lithium, zinc, or iron as they are more reactive metals. However, nickel can react with mercury, as mercury is a more reactive metal. This reaction will result in the formation of a compound between nickel and mercury.Rate this question:
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Mar 14, 2023Quiz Edited by
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Dec 21, 2011Quiz Created by
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