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

Metric Prefixes

GOB Chemistry

1. Matter and Measurements

Metric Prefixes

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Multiple Choice

Which quantity in the following pair is smaller?

155 pm

7.8 x 10^–9 cm

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Verified step by step guidance

First, understand the units involved: pm stands for picometers, and cm stands for centimeters. These are both units of length, but they are on different scales.

Convert picometers to centimeters. Recall that 1 picometer (pm) is equal to 1 x 10^-12 meters, and 1 meter is equal to 100 centimeters. Therefore, 1 pm = 1 x 10^-12 m = 1 x 10^-10 cm.

Calculate the length in centimeters for 155 pm. Multiply 155 by the conversion factor from picometers to centimeters: 155 pm x (1 x 10^-10 cm/pm).

Compare the converted value of 155 pm in centimeters to 7.8 x 10^-9 cm. This involves comparing two numbers in scientific notation.

Determine which of the two values is smaller by comparing the exponents and coefficients in scientific notation. The smaller value will have a smaller exponent or, if the exponents are the same, a smaller coefficient.