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

Conversion Factors (Simplified)

GOB Chemistry

1. Matter and Measurements

Conversion Factors (Simplified)

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3:55 minutes

Problem 54b

Textbook Question

At Sandra's clinic, the medications in a. to d. are used. Write the equality and two conversion factors, and identify the numbers as exact or give the number of significant figures for each:
b. The Daily Value (DV) for selenium is 70. mcg.

Verified step by step guidance

Step 1: Write the equality based on the given information. The Daily Value (DV) for selenium is 70 mcg, which can be expressed as an equality:

1 DV = 70 mcg

Step 2: Create the first conversion factor using the equality. For example,

1 DV / 70 mcg

Step 3: Create the second conversion factor by inverting the first conversion factor. For example,

70 mcg / 1 DV

Step 4: Identify whether the number 70 is exact or has significant figures. Since the DV is a defined value, the number 70 is considered exact.

Step 5: Review the equality and conversion factors to ensure they are correctly formatted and can be used in calculations involving selenium dosage or DV comparisons.

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Key Concepts

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

Daily Value (DV)

The Daily Value (DV) is a reference value used on food labels to indicate how much a nutrient in a serving of food contributes to a daily diet. It helps consumers understand the nutritional content of food in the context of a total daily intake. For selenium, the DV is set at 70 micrograms (mcg), which serves as a guideline for adequate intake.

Significant Figures

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. Understanding significant figures is crucial for accurately reporting measurements and calculations, especially in scientific contexts where precision is vital.

Conversion Factors

Conversion factors are ratios used to convert a quantity expressed in one unit to another unit. They are essential in calculations involving different measurement systems, ensuring that the values remain equivalent. For example, to convert micrograms to milligrams, one would use the conversion factor of 1 mg = 1000 mcg.

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