AP Biology : Understand basic chemistry
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Example Questions
Example Question #121 : Understand Basic Chemistry
Substances A and B are both neutral in charge at the beginning of a reaction. After undergoing a redox reaction, substance A is positively charged and substance B is negatively charged. Which of the following is true?
Substance B is the reducing agent
Substance A is undergoing oxidation
Substance B is undergoing oxidation
Substance A is the oxidizing agent
Substance A is undergoing oxidation
Since substance A ends up being positively charged, that means it must have lost or donated a negatively charged electron, thus it is oxidized and, is the reducing agent. Substance B ends up being negatively charged, so that means it gained an negatively charged electron, thus it is reduced and, is the oxidizing agent.
Example Question #122 : Understand Basic Chemistry
Given this reaction which of the following is correct?
During the redox reaction chlorine becomes the negatively charged chloride ion, so we know that it has gained an electron. This means that it underwent reduction and is an oxidizing agent. Sodium loses an electron since it becomes positively charge, thus we know it has been oxidized and is the reducing agent.
Example Question #123 : Understand Basic Chemistry
The given reaction is an example of __________.
electron transferral reaction
redox reaction
electron swapping reaction
electron compensation reaction
redox reaction
This is an example of an oxidation-reduction reaction or redox reaction. In a redox reaction, a negatively charged electron from one substance (sodium in this case) is transferred to another substance (chlorine in this case). This results in a positively charge sodium ion and a negatively charge chloride ion.
Example Question #124 : Understand Basic Chemistry
Substance A is losing an electron to substance B. In this case, __________.
both substances are being reduced
substance A is undergoing oxidation and substance B is undergoing reduction
substance A is undergoing reduction and substance B is undergoing oxidation
both substances are being oxidized
substance A is undergoing oxidation and substance B is undergoing reduction
Since substance A is losing an electron it is undergoing oxidation (oxidation is loss of electrons). Substance B is gaining an electron and so it is undergoing reduction (reduction is gain of electrons). Substance A is the reducing agent because it causes the reduction of substance B, and substance B is the oxidizing agent because it causes the oxidation of substance A.
Example Question #125 : Understand Basic Chemistry
Substance A is gaining an electron from substance B. In this case, __________.
both substance A and B are being oxidized
substance A is undergoing oxidation and substance B is undergoing reduction
both substance A and B are being reduced
substance A is undergoing reduction and substance B is undergoing oxidation
substance A is undergoing reduction and substance B is undergoing oxidation
Since substance B is losing an electron it is undergoing oxidation (oxidation is loss of electrons). Substance A is gaining an electron and so it is undergoing reduction (reduction is gain of electrons). Substance B is the reducing agent because it causes the reduction of substance A, and substance A is the oxidizing agent because it causes the oxidation of substance B.
Example Question #126 : Understand Basic Chemistry
Substances A and B are both neutral in charge at the beginning of a reaction. After undergoing a redox reaction, substance A is positively charged and substance B is negatively charged. Which of the following is true?
Substance A is the oxidizing agent and substance B is the reducing agent
Substance A is the reducing agent and substance B is the oxidizing agent
Both substance A and B are reducing agents
Both substance A and B are oxidizing agents
Substance A is the reducing agent and substance B is the oxidizing agent
Since substance A ends up being positively charged, that means it must have lost or donated a negatively charged electron, thus it is oxidized and, is the reducing agent. Substance B ends up being negatively charged, so that means it gained an negatively charged electron, thus it is reduced and, is the oxidizing agent.
Example Question #127 : Understand Basic Chemistry
Which of the following is correct regarding the given reaction?
During the redox reaction chlorine becomes the negatively charged chloride ion, so we know that it has gained an electron. This means that it undergone reduction and is an oxidizing agent. Sodium loses an electron since it becomes positively charge, thus we know it has been oxidized and is the reducing agent.
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