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

Significant Figures (Simplified)

GOB Chemistry

1. Matter and Measurements

Significant Figures (Simplified)

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1:43 minutes

Problem 17bTimberlake - 13th Edition

Textbook Question

dentify the numbers in each of the following statements as measured or exact: a. A patient has a mass of 67.5 kg.

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Understand the difference between measured and exact numbers. Measured numbers are obtained from measurements and have a degree of uncertainty, while exact numbers are counted or defined and have no uncertainty.

Consider the context of the number given in the statement. In this case, the mass of a patient is provided.

Recognize that mass is typically measured using a scale or balance, which introduces some level of uncertainty due to the precision of the measuring instrument.

Identify that the number 67.5 kg is a measured number because it is obtained through a measurement process and is subject to the precision of the measuring device.

Conclude that the number in the statement is a measured number, as it represents a physical quantity obtained through measurement.

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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 a degree of error based on the precision of the measuring instrument. For example, a mass of 67.5 kg indicates that the measurement was taken with a scale that can measure to at least one decimal place, reflecting a level of precision.

Exact Numbers

Exact numbers are values that are counted or defined and have no uncertainty associated with them. They are considered to be infinitely precise. Examples include the number of patients in a study or defined quantities like 100 centimeters in a meter, where the value is exact and not subject to measurement error.

Significant Figures

Significant figures are the digits in a number that contribute to its precision. This concept is crucial in distinguishing between measured and exact numbers, as it helps indicate the reliability of the measurement. In the case of 67.5 kg, the three significant figures suggest a specific level of precision in the measurement process.