Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following:1. Air2. Gaseous combu...
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Consider the following:
1. Air
2. Gaseous combustion products
3. Steam
Which of these are pure substances, assuming there is no phase change?
- a)1 and 2 only
- b)1 and 3 only
- c)2 and 3 only
- d)1, 2 and 3
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Consider the following:1. Air2. Gaseous combustion products3. SteamWhi...
A pure substance is one whose chemical composition does not change during thermodynamic processes.
- Pure Substance is one with uniform and invariant chemical composition.
- Eg: Elements and chemical compounds are pure substances. (water, stainless steel)
- Mixtures are not pure substances. (eg: Humid air)
- Exception!! Air is treated as a pure substance though it is a mixture of gases.
Gaseous combustion products are a mixture of gases and not a pure substance.
Most Upvoted Answer
Consider the following:1. Air2. Gaseous combustion products3. SteamWhi...
Pure Substances in the Given List
In order to determine which substances are pure substances, we need to understand the definition of a pure substance. A pure substance is a material that consists of only one type of particle, either atoms or molecules. These particles have the same chemical composition and properties throughout the substance.
Now let's analyze each item in the given list to identify whether it is a pure substance or not.
1. Air:
Air is a mixture of gases, primarily nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and traces of other gases. Since air is a mixture of different gases, it cannot be considered a pure substance. Therefore, air is not a pure substance.
2. Gaseous Combustion Products:
Gaseous combustion products refer to the gases formed during the combustion process. Combustion is a chemical reaction that involves the rapid oxidation of a fuel, producing heat, light, and combustion products. These products include gases like carbon dioxide (CO2), water vapor (H2O), nitrogen (N2), and others, depending on the fuel composition.
Similar to air, gaseous combustion products are formed by the combination of different gases. Hence, they are not pure substances.
3. Steam:
Steam is the gaseous phase of water, formed when water is heated to its boiling point and undergoes vaporization. It consists of water vapor molecules, which are H2O in a gaseous state. Steam is considered a pure substance because it consists of only one type of molecule, H2O, and has uniform properties throughout.
Conclusion:
Based on the analysis above, the pure substances among the given options are:
- Steam (Option 1)
- Gaseous Combustion Products (Option 3)
Therefore, the correct answer is option 'B' (1 and 3 only).
In order to determine which substances are pure substances, we need to understand the definition of a pure substance. A pure substance is a material that consists of only one type of particle, either atoms or molecules. These particles have the same chemical composition and properties throughout the substance.
Now let's analyze each item in the given list to identify whether it is a pure substance or not.
1. Air:
Air is a mixture of gases, primarily nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and traces of other gases. Since air is a mixture of different gases, it cannot be considered a pure substance. Therefore, air is not a pure substance.
2. Gaseous Combustion Products:
Gaseous combustion products refer to the gases formed during the combustion process. Combustion is a chemical reaction that involves the rapid oxidation of a fuel, producing heat, light, and combustion products. These products include gases like carbon dioxide (CO2), water vapor (H2O), nitrogen (N2), and others, depending on the fuel composition.
Similar to air, gaseous combustion products are formed by the combination of different gases. Hence, they are not pure substances.
3. Steam:
Steam is the gaseous phase of water, formed when water is heated to its boiling point and undergoes vaporization. It consists of water vapor molecules, which are H2O in a gaseous state. Steam is considered a pure substance because it consists of only one type of molecule, H2O, and has uniform properties throughout.
Conclusion:
Based on the analysis above, the pure substances among the given options are:
- Steam (Option 1)
- Gaseous Combustion Products (Option 3)
Therefore, the correct answer is option 'B' (1 and 3 only).
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Consider the following:1. Air2. Gaseous combustion products3. SteamWhich of these are pure substances, assuming there is no phase change?a)1 and 2 onlyb)1 and 3 onlyc)2 and 3 onlyd)1, 2 and 3Correct answer is option 'B'. Can you explain this answer?
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