Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Properties of Water- The Universal Solvent

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Properties of Water- The Universal Solvent

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Problem 1

Textbook Question

Which of the following is a hydrophobic material?a. paperb. table saltc. waxd. sugar

Verified step by step guidance

Understand the concept of hydrophobicity: Hydrophobic materials repel water and do not mix well with it. They are typically non-polar substances.

Analyze each option to determine its interaction with water: Consider the chemical nature of each material.

Option a: Paper is made of cellulose, which is hydrophilic due to its polar nature and ability to form hydrogen bonds with water.

Option b: Table salt (sodium chloride) is ionic and dissolves easily in water, making it hydrophilic.

Option c: Wax is composed of long-chain hydrocarbons, which are non-polar and do not interact well with water, making it hydrophobic.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hydrophobicity

Hydrophobicity refers to the property of a substance to repel water. Hydrophobic materials do not mix with water and tend to be non-polar, meaning they do not have charged regions that can interact with water molecules. This characteristic is crucial in various applications, such as waterproofing and the behavior of biological membranes.

Polarity

Polarity is a chemical property that describes the distribution of electrical charge over the atoms in a molecule. Polar molecules have a significant difference in electronegativity between their atoms, leading to partial positive and negative charges. In contrast, non-polar molecules, which are typically hydrophobic, have an even distribution of charge and do not interact favorably with water.

Examples of Hydrophobic Materials

Common examples of hydrophobic materials include wax, oils, and certain plastics. These materials do not dissolve in water and often form a separate layer when mixed with it. Understanding these examples helps in identifying hydrophobic substances in various contexts, such as in nature or industrial applications.