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 & Chemical Changes

GOB Chemistry

1. Matter and Measurements

Physical & Chemical Changes

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1:46 minutes

Problem 11d

Textbook Question

What type of change, physical or chemical, takes place in each of the following?
d. A puzzle is cut into 1000 pieces.

Verified step by step guidance

Identify the key difference between physical and chemical changes. A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different chemical properties.

Analyze the scenario: A puzzle is cut into 1000 pieces. Cutting the puzzle does not alter the material or composition of the puzzle; it only changes its shape and size.

Determine whether the change involves a transformation in the chemical structure of the material. In this case, the puzzle remains made of the same material, so no chemical bonds are broken or formed.

Conclude that the change is a physical change because the process only affects the physical appearance (size and shape) of the puzzle without altering its chemical composition.

Remember that physical changes are typically reversible (e.g., the puzzle pieces can be reassembled), whereas chemical changes are often irreversible or require a chemical reaction to reverse.

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Key Concepts

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

Physical Change

A physical change involves a transformation that does not alter the chemical composition of a substance. In this type of change, the material may change its form, size, or state, but its molecular structure remains intact. For example, cutting a puzzle into pieces changes its shape but does not affect the individual pieces' material properties.

Chemical Change

A chemical change results in the formation of one or more new substances with different chemical properties. This type of change involves a rearrangement of atoms and bonds, leading to a transformation that cannot be easily reversed. Examples include rusting iron or burning wood, where the original substances are fundamentally altered.

Distinguishing Between Changes

Understanding the difference between physical and chemical changes is crucial for analyzing various processes. Physical changes are typically reversible and do not involve changes at the molecular level, while chemical changes are often irreversible and involve new substances being formed. This distinction helps in categorizing reactions and understanding material properties.

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