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| Standard Deviation, Mean, Median & Mode | 7 mins | 0 completed | Learn |
| Metric Prefixes | 17 mins | 0 completed | Learn Summary |
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| End of Chapter 1 Problems | 51 mins | 0 completed | Learn |
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| The Scientific Method |
| Physical & Chemical Properties |
Precious metals and gems are measured in troy weights in the English system:
24 grains = 1 pennyweight (exact)
20 pennyweight = 1 troy ounce (exact)
12 troy ounces = 1 troy pound (exact)
1 grain = 0.0648 gram
1 carat = 0.200 gram
b. What is the mass of a troy ounce of gold in grams and in carats?
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