Term
| Determine what digits are significant and which are not? |
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Definition
- All non zero digits are significant.
- Interior zeros (zeros between two numbers) are significant.
- Trailing zeros (after a decimal point) are significant.
- Leading zeros (zeros to the left of the first nonzero number) are not significant. They only serve to locate the decimal point.
- Zeros at the end of a number but before the decimal point are ambigious and should be avoided by using the scientific method.
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Term
| What are the base units in the metric system? |
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Definition
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Term
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Definition
- Defined or counted
- ex. Our class has 24 students
- one dozen=12=12.0000000000000
- 1m=100cm
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Term
| What are measured numbers? |
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Definition
- always have some uncertainty
- last digit is our best guess
- 4.3 is ok, 4.25 is not ok-only one decimal point guess
- depends on instrument/scale used and depends on person measuring
- 1/10 of the smallest division
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Term
When dividing numbers expressed in the scientific method...
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Definition
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Term
| When multiplying numbers expressed in the scientific method... |
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Definition
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Term
| Metric System units for length, mass, time, temperatue and amount of substance. |
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Definition
Quantity SI units Metric SI unit symbol
Length meter m m
Mass kilogram g kg
Time second s s
Temp. Kelvic degrees C K
Amt. Sub. mole mol mol |
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Term
| What is the difference between mass and weight? |
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Definition
Mass
- amount of matter
- is constant everywhere
Weight
- amount of matter times gravity force
- changes in change of gravity.
On the moon, your mass remains the same, but your weight changes. |
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Term
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Definition
| The density of a substance is a ratio of its mass to its volume. |
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Term
| How do you calculate density? |
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Definition
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