Sure, let's break down the questions one by one and provide a detailed solution for each.
### Question (a)
Given Information:
- 20 grams of salt dissolve in 100 ml of water.
- 50 grams of salt dissolve in 200 ml of water.
Steps to Solution:
1. For the first part:
- Given that 20 grams of salt dissolve in 100 ml of water.
- This implies a solubility of [tex]\( \frac{20 \text{ grams}}{100 \text{ ml}} = 0.2 \text{ grams per ml} \)[/tex].
2. For the second part:
- Given that 50 grams of salt dissolve in 200 ml of water.
- This implies a solubility of [tex]\( \frac{50 \text{ grams}}{200 \text{ ml}} = 0.25 \text{ grams per ml} \)[/tex].
3. Comparing both:
- Both statements describe a feasible solubility scenario for salt in water. Since salt is highly soluble in water, these ratios fall well within the possible range.
Conclusion:
- This part of the question serves as a conceptual check rather than needing a direct numerical answer beyond the ratios provided.
### Question 6
Given Information:
- Four materials are mentioned: brass, bronze, gold, steel.
Steps to Solution:
1. Classification:
- Brass: Alloy of copper and zinc.
- Bronze: Alloy of copper and tin.
- Gold: Pure element, not an alloy.
- Steel: Alloy of iron, carbon, and other elements.
2. Identifying the exception:
- Out of the given options, gold is the only one that is not a metal alloy.
Answer:
- Gold is the element that is not a metal alloy.
- The correct option is: 3 (gold).
### Question 7
Given Information:
- A scenario where a small amount of solute is placed in a large amount of solvent is described.
Steps to Solution:
1. Understanding the result:
- Concentrated: Would imply a high amount of solute in a small amount of solvent.
- Diluted: Indicates a low concentration of solute due to a large amount of solvent.
- Uniform: Suggests the solute is evenly distributed, which can occur but doesn’t strictly answer the concentration.
- Immiscible: Refers to substances that do not mix (e.g., oil and water), not applicable here.
2. Correct description:
- A small amount of solite in a large amount of solvent results in a diluted solution.
Answer:
- The solution will be diluted.
- The correct option is: 2 (the solution will be diluted).
### Summary of Answers:
- Question 6: The answer is 3 (gold).
- Question 7: The answer is 2 (the solution will be diluted).
