How is "hard" water made "soft"? Explain why that process works.

7. Identify and define two processes by which water naturally changes from a solid or liquid to a gas. 8. Define exchange pool and reservoir, and identify an example of each in the water cycle. 9. State three ways that carbon dioxide enters Earth's atmosphere. 10. What is climate? How does it differ from the weather? 11. What is a rain shadow? 12. How does climate influence plant growth? 13. What is the photic zone of the ocean?

Draw and describe the structure and properties of water in detail

1. Discuss the three main intermolecular forces described in chapter 11 using relevant examples. 2. List the following substances: Ar, Cl2, CH4 and CH3COOH in order of their increasing strength of intermolecular attractions. Give reason for your answer. 3a. Which intermolecular force is present in Water? Explain the reason for your answer. b. Some of the remarkable consequences  of the intermolecular force present in water can be used to explain the  "Expansion of water upon freezing", which explains why icebergs float in water and why water pipes burst in freezing temperatures.   Question: Using the concept of the intermolecular force present in water: Discuss why water expands upon freezing.  4."CH3OH boils at 65*C, while CH3SH boils at 6*C" . Which intermolecular force accounts for this difference? Explain. Respond to one student's post.

Describe one thing that is special about the bonds between Oxygen and hydrogen in a water molecule that makes hydrogen-bonding possible.

2. Which one of the following is not a physical property of water? A) It boils at 100°C at 1 atm pressure. B) It freezes at 0°C at 1 atm pressure. C) It is clear and colorless. D) It reacts rapidly with potassium metal to form potassium hydroxide.

Sub parts 11 and 12

Aspirin has a higher molar mass compared to salicylic acid, however aspirin melts at a lower temperature than salicylic acid. Provide a brief explanation for this observation. Table 1 Compound: Formula: Salicylic Acid C;H6O3 Aspirin C9H3O4 Molar Mass: 138.12 Melting point: Ka 158-160°C 1.08 x 10³ 180.15 140-142°C 2.72 x 10$ pKa Solubility (g/100ML) 2.99 4.57 0.18 0.25

Select the compound that will have the lower equilibrium vapor pressure based on predicted intermolecular forces. pentane (C5H12) phosphorus tribromide

Vapor pressure of 25 percent by mass ascorbic acid (C6H8O6) solution in water is 24.5 torr at 25 o What is the             vapor pressure of water at the same temperature? 23.7 torr     B. 25.9 torr   C. 23.2 torr     D. 25.3 torr   E.  26.7 torr