Table of contents

1. Matter and Measurements4h 29m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 35m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines38m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 46m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

1. Matter and Measurements

Physical Properties

GOB Chemistry

1. Matter and Measurements

Physical Properties

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0:48 minutes

Problem 10bTimberlake - 13th Edition

Textbook Question

Describe each of the following as a physical or chemical property: b. Apple slices turn brown when they are exposed to air.

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Step 1: Understand the difference between physical and chemical properties.

Step 2: Define a physical property as a characteristic that can be observed or measured without changing the substance's identity.

Step 3: Define a chemical property as a characteristic that describes a substance's ability to change into a different substance.

Step 4: Consider the process of apple slices turning brown when exposed to air.

Step 5: Recognize that the browning of apple slices involves a chemical reaction with oxygen, indicating a chemical property.

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Key Concepts

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

Physical Property

A physical property is a characteristic of a substance that can be observed or measured without changing its chemical composition. Examples include color, odor, melting point, and density. In the context of apple slices turning brown, the initial appearance of the slices is a physical property that can be observed before any chemical changes occur.

Chemical Property

A chemical property describes a substance's ability to undergo a specific chemical change. This includes reactions with other substances, such as oxidation or combustion. The browning of apple slices is a chemical property, as it involves the reaction of phenolic compounds in the apples with oxygen in the air, leading to the formation of brown pigments.

Oxidation Reaction

An oxidation reaction is a type of chemical reaction where a substance loses electrons, often involving the reaction with oxygen. In the case of apple slices, the exposure to air triggers oxidation, causing the phenolic compounds to oxidize and produce melanin, which results in the browning effect. This process is a key example of how environmental factors can influence chemical properties.