# Measurements and Calculations

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The flashcards below were created by user Anonymous on FreezingBlue Flashcards.

1. What is measurement?
• Its the quantitative observation/comparison
• Contains two parts: A number and unit
2. Scientific Notation
A technique used to express very large or very small numbers based on powers of 10

Ex. 1.23 X 102
3. Standard Notation
The number before it is placed in scientific notation
4. Kilo
• Symbol: K
• Value: 1,000
• SN: 103
5. Centi
• Symbol: c
• Value: 0.01
• SN: 10-2
6. Milli
• Symbol: m
• Value: 0.001
• SN: 10-3
7. Length is measured in...
SI unit: Meter (m)
8. 1 inch =
2.54cm (exact number)
9. Solid volume is measured in...
SI unit: m3

10. Gas or liquid volume is measure in...
SI unit: mL
11. 1mL =
1 cm3
12. What is volume?
The amount of 3-dimensional space in m3
13. What is mass?
• Amount of matter present
• SI unit: kg
14. Uncertainty in Measurement
• A measurement always has some amount of uncertainty
• Comes from limitations of techniques & equipment
15. Significant Figures
Can be used to indicate the uncertainty of a measurement.

(0.57 ± 0.01)
16. Rules for counting SF's
• All nonzero integers are always significant
• Leading zeros never count as SFs
• Captive zeros are always significant
• Trailing zeros are significant if there is decimal pt
17. Unlimited number of SFs come from..
Exact numbers!

• ex. 2.54 cm/in
• 1000 mL in a L
• 121 students in a room
18. An exact numbers are
• Known with certainty
• Defined numbers: 1 minute = 60 seconds ect

### Card Set Information

 Author: Anonymous ID: 259309 Filename: Measurements and Calculations Updated: 2014-01-30 22:55:31 Tags: Chemistry Folders: Chemistry Description: Chemistry 130; Chapter 2 Show Answers:

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