Example Question - sulfide compound
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Understanding Properties of Sulfide Compound in Onions
The image contains a question about the properties of the sulfide compound released when cutting onions, which causes tearing of the eyes. The text states that peeling onions under running water reduces the problem and asks which statements are true about the sulfide compound. The statements given are: 1. It is soluble in water. 2. It has a low boiling point. 3. It has small and light ions with weak bondings. 4. It is a covalent compound with weak covalent bonds. The correct statements regarding the sulfide compound are: 1. It is soluble in water: This is true. The compound that causes irritation, known as syn-propanethial-S-oxide, is soluble in water, which is why rinsing the onions under water can help reduce the release of the irritating compounds. 2. It has a low boiling point: This is likely to be true. Volatile compounds with low boiling points are typically responsible for the kinds of irritation observed when cutting onions, as they can easily become airborne and come into contact with the eyes. 3. It has small and light ions with weak bondings: This statement is not true. The compound in question is not ionic; rather, it is a small molecule with covalent bonds. 4. It is a covalent compound with weak covalent bonds: This statement is misleading. While it is a covalent compound, the "weak covalent bonds" part is not necessarily correct. The compound is volatile because of its structure, not due to weak covalent bonds. In summary, statements 1 and 2 are the correct ones regarding the properties of the sulfide compound released when cutting onions.
Understanding Sulfide Compound in Onions
The image presents a set of statements about the sulfide compound released when cutting onions. To solve which of these statements are true about the sulfide compound, we need to analyze each statement: 1. **It is soluble in water.** - The fact that peeling onions under running water reduces the problem suggests that the sulfide compound released by onions is at least partially soluble in water. The water likely dilutes or washes away the compound, thus reducing its effect on the eyes. 2. **It has a low boiling point.** - This statement is likely true because the compound vaporizes at room temperature or below the boiling point of water, allowing it to reach the eyes and cause irritation. If it had a high boiling point, it would not vaporize as easily and thus would not affect the eyes as much. 3. **It has small and light ions with weak bondings.** - This statement is somewhat ambiguous because the sulfide compounds released by onions are not ionic compounds; they are actually small, volatile sulfur-containing organic molecules. Therefore, they do not have ions but instead have covalent bonds. 4. **It is a covalent compound with weak covalent bonds.** - This is true, as the compounds responsible for the tearing effect are covalent molecules. They contain relatively weak bonds that can be broken, allowing for the compound to volatilize and irritate the eyes. Based on the above analysis, the true statements are likely 1 and 2, and possibly 4, depending on what is meant by "weak covalent bonds." Statement 3 is not correct because the compound is not ionic.
Properties of Sulfide Compound from Onions
The question refers to the release of a sulfide compound when cutting onions, which causes irritation to the eyes. Let's evaluate each statement provided in the question: 1. It is soluble in water. Syn-propanethial-S-oxide is the chemical released from onions which causes the eyes to water, and it is indeed water-soluble. This is why peeling onions under running water can help reduce the irritation as the compound is washed away before it can reach the eyes. 2. It has a low boiling point. This statement is likely to be true as well because the compound is volatile (it easily vaporizes), which is why it can reach the eyes and react with the moisture to form sulfuric acid, resulting in irritation. 3. It has small and light ions with weak bondings. This statement is not accurate. The compound released by onions is not ionic; it's a small organic molecule with covalent bonding, so it does not have ions. 4. It is a covalent compound with weak covalent bonds. This statement is partially true. The compound does have covalent bonds, as it's an organic molecule. However, not all the bonds in the molecule are necessarily weak; it has a variety of covalent bonds with different strengths. Given the information and the nature of the compound, the true statements would be: - It is soluble in water, which supports statement 1. - It has a low boiling point, which supports statement 2. Therefore, based on the provided options, statements 1 and 2 are true about the sulfide compound released when cutting onions.
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