Table of contents

1. Matter and Measurements4h 31m
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 27m
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. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
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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0:42 minutes

Problem 10e

Textbook Question

Describe each of the following as a physical or chemical property:
e. Propane gas is compressed to a liquid for placement in a small cylinder.

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Understand the difference between physical and chemical properties: A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity (e.g., state, color, density). A chemical property describes a substance's ability to undergo a chemical change, resulting in a new substance (e.g., flammability, reactivity).

Analyze the process described: Propane gas is being compressed into a liquid. This involves a change in the state of matter (from gas to liquid) due to the application of pressure.

Determine whether the chemical identity of propane changes: In this process, the propane remains chemically the same (C₃H₈). There is no chemical reaction or formation of a new substance.

Conclude that the process involves a physical property: Since the change is only in the state of matter and not in the chemical composition, this is a physical property.

Summarize: The compression of propane gas into a liquid for placement in a cylinder is an example of a physical property because it involves a change in state without altering the chemical identity of propane.

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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 identity. Examples include color, density, melting point, and state of matter. In the context of propane gas being compressed, its ability to change from a gas to a liquid under pressure is a physical property, as it does not alter the chemical structure of propane.

Chemical Property

A chemical property describes a substance's ability to undergo a specific chemical change or reaction. This includes reactivity with other chemicals, flammability, and acidity. While compressing propane does not change its chemical properties, understanding its reactivity and combustion characteristics is essential when discussing its use as a fuel.

Phase Change

A phase change refers to the transition of a substance from one state of matter to another, such as from gas to liquid. This process involves energy changes and can be influenced by temperature and pressure. In the case of propane, compressing the gas into a liquid involves a phase change that allows it to be stored efficiently in a cylinder, demonstrating the principles of gas behavior under pressure.

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Which of the following is not a physical property?

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Describe each of the following as a physical or chemical property:

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Describe each of the following as a physical or chemical property:

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Describe each of the following as a physical or chemical property:

a. Neon is a colorless gas at room temperature.

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Textbook Question

Butane (C₄H₈) is an easily compressible gas used in cigarette lighters. It has a melting point of and a boiling point of -138.4 °C and a boiling point of -0.5 °C. Would you expect a butane lighter to work in winter when the temperature outdoors is 25 °F? Why or why not?

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Textbook Question

Identify each of the following as a physical or chemical property:

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