QuestionMay 17, 2025

12) Most chemical explosions are __ reactions. A) nuclear fission B) neutralization C) condensation D) oxidation-reduction 13) The most abundant element (by mass) in the human body is A) carbon. B) nitrogen. C) water. D) oxygen. 14) Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is A) MgO_(3) B) Mg_(3)O. C) Mg_(4)O_(4) D) MgO 15) Approximately what percentage of the earth's crust is composed of oxygen? A) approx 5% B) approx 40% C) approx 75% D) approx 50% 16) In the reaction N_(2)+3H_(2)arrow 2NH_(3) nitrogen is A) a product. B) a reducing agent. C) a catalyst. D) an oxidizing agent. 17) Antioxidants are A) oxidizing agents found in foods. B) fat-soluble. C) water soluble. D) reducing agents found in foods.

12) Most chemical explosions are __ reactions. A) nuclear fission B) neutralization C) condensation D) oxidation-reduction 13) The most abundant element (by mass) in the human body is A) carbon. B) nitrogen. C) water. D) oxygen. 14) Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is A) MgO_(3) B) Mg_(3)O. C) Mg_(4)O_(4) D) MgO 15) Approximately what percentage of the earth's crust is composed of oxygen? A) approx 5% B) approx 40% C) approx 75% D) approx 50% 16) In the reaction N_(2)+3H_(2)arrow 2NH_(3) nitrogen is A) a product. B) a reducing agent. C) a catalyst. D) an oxidizing agent. 17) Antioxidants are A) oxidizing agents found in foods. B) fat-soluble. C) water soluble. D) reducing agents found in foods.
12) Most chemical explosions are __ reactions. A) nuclear fission B) neutralization C) condensation D) oxidation-reduction 13) The most abundant element (by mass) in the human body is A) carbon. B) nitrogen. C) water. D) oxygen. 14) Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is A) MgO_(3) B) Mg_(3)O. C) Mg_(4)O_(4) D) MgO 15) Approximately what percentage of the earth's crust is composed of oxygen? A) approx 5% B) approx 40% C) approx 75% D) approx 50% 16) In the reaction N_(2)+3H_(2)arrow 2NH_(3) nitrogen is A) a product. B) a reducing agent. C) a catalyst. D) an oxidizing agent. 17) Antioxidants are A) oxidizing agents found in foods. B) fat-soluble. C) water soluble. D) reducing agents found in foods.

Solution
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Answer

12) D) oxidation-reduction ### 13) D) oxygen. ### 14) D) MgO ### 15) D) \approx 50\% ### 16) B) a reducing agent. ### 17) D) reducing agents found in foods. Explanation 1. Identify the type of reaction for explosions Most chemical explosions are **oxidation-reduction** reactions due to rapid energy release. 2. Determine the most abundant element in the human body by mass **Oxygen** is the most abundant element by mass in the human body. 3. Identify the compound formed when magnesium reacts with oxygen Magnesium reacts with oxygen to form **MgO** (magnesium oxide). 4. Estimate the percentage of oxygen in the earth's crust Oxygen composes approximately **50%** of the earth's crust by mass. 5. Determine the role of nitrogen in the given reaction In the reaction N_{2}+3H_{2}\rightarrow 2NH_{3}, nitrogen acts as a **reducing agent**. 6. Define antioxidants Antioxidants are **reducing agents found in foods**.

Explanation

1. Identify the type of reaction for explosions<br /> Most chemical explosions are **oxidation-reduction** reactions due to rapid energy release.<br /><br />2. Determine the most abundant element in the human body by mass<br /> **Oxygen** is the most abundant element by mass in the human body.<br /><br />3. Identify the compound formed when magnesium reacts with oxygen<br /> Magnesium reacts with oxygen to form **$MgO$** (magnesium oxide).<br /><br />4. Estimate the percentage of oxygen in the earth's crust<br /> Oxygen composes approximately **50%** of the earth's crust by mass.<br /><br />5. Determine the role of nitrogen in the given reaction<br /> In the reaction $N_{2}+3H_{2}\rightarrow 2NH_{3}$, nitrogen acts as a **reducing agent**.<br /><br />6. Define antioxidants<br /> Antioxidants are **reducing agents found in foods**.
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