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

Significant Figures (Simplified)

GOB Chemistry

1. Matter and Measurements

Significant Figures (Simplified)

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1:23 minutes

Problem 17b

Textbook Question

Identify the numbers in each of the following statements as measured or exact:
b. A patient is given 2 tablets of medication.

Verified step by step guidance

Step 1: Understand the difference between measured and exact numbers. Measured numbers are obtained through measurement and have a degree of uncertainty, while exact numbers are counted or defined and have no uncertainty.

Step 2: Analyze the given statement: 'A patient is given 2 tablets of medication.'

Step 3: Recognize that the number '2' in this context refers to a count of tablets, which is a discrete quantity.

Step 4: Recall that counted numbers, such as the number of tablets, are considered exact because they are not subject to measurement uncertainty.

Step 5: Conclude that the number '2' in this statement is an exact number.

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Key Concepts

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

Measured Numbers

Measured numbers are values obtained through measurement and are subject to uncertainty. They include any quantity that can vary, such as weight, height, or temperature. The precision of measured numbers is limited by the measuring instrument used, which introduces a degree of error.

Exact Numbers

Exact numbers are values that are counted or defined and have no uncertainty associated with them. They are typically whole numbers, such as the number of students in a classroom or the number of tablets prescribed. Exact numbers are considered to have infinite precision and do not change regardless of the measuring context.

Contextual Interpretation

Understanding whether a number is measured or exact often depends on the context in which it is presented. In the example of '2 tablets of medication,' the number is exact because it refers to a specific count of tablets, which is defined and does not involve measurement uncertainty. Contextual interpretation helps clarify the nature of the numbers in various scenarios.