Which of the following is true about oxidation reactions?
A. Oxidation reactions are the principal source of energy on Earth.
B. All oxidation reactions are accompanied by reduction reactions.
C. The burning of wood in a fireplace and the metabolization of food by your body are oxidation reactions.
D. all of the above
Well, B and C are correct. Now on A, it seems to me that the Sun is the principal source of Energy on Earth, however, I am not certain what the answer writer had in mind when she wrote "on Earth". If she meant energy produced on Earth, then that will not include the Sunlight....in that case, answer d. So I dunno.
well thank you for your information :)
The correct answer is D. All of the above.
Explanation:
A. Oxidation reactions are indeed a principal source of energy on Earth. Many natural processes like combustion and respiration involve oxidation reactions that release energy.
B. Oxidation reactions are always accompanied by reduction reactions. In an oxidation-reduction (redox) reaction, the substance being oxidized loses electrons, while the substance being reduced gains electrons.
C. Both the burning of wood in a fireplace and the metabolization of food by your body are examples of oxidation reactions. The wood and food molecules undergo oxidation, releasing energy in the process.
To determine which of the options is true about oxidation reactions, let's examine each option one by one:
A. Oxidation reactions are the principal source of energy on Earth.
To determine the validity of this statement, we can look at the process of photosynthesis. During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen, with the help of sunlight. This process is an example of a reduction reaction because the carbon in carbon dioxide gains hydrogen to form glucose. Since oxidation reactions are always accompanied by reduction reactions, we can conclude that without reduction reactions, oxidation reactions alone cannot be the principal source of energy on Earth. Therefore, option A is not true.
B. All oxidation reactions are accompanied by reduction reactions.
This statement is in line with the definition of oxidation-reduction (redox) reactions, where oxidation and reduction always occur together. In an oxidation reaction, a substance loses electrons (oxidation), while in a reduction reaction, a substance gains electrons (reduction). This exchange of electrons forms the basis of redox reactions, making option B true.
C. The burning of wood in a fireplace and the metabolization of food by your body are oxidation reactions.
The burning of wood in a fireplace is a classic example of an oxidation reaction. Wood, which contains carbon and hydrogen, reacts with oxygen in the air to produce carbon dioxide and water vapor. Similarly, the metabolization of food by your body involves the breakdown of complex organic molecules (such as carbohydrates and fats) to produce carbon dioxide, water, and energy. This process is also classified as an oxidation reaction. Therefore, option C is true.
D. All of the above.
Since option A is not true, we can conclude that option D is also not true. Therefore, the correct answer is option C: "The burning of wood in a fireplace and the metabolization of food by your body are oxidation reactions."