# Measurements and Calculation

The flashcards below were created by user michaelirby98 on FreezingBlue Flashcards.

1. Quantitative observation
• Measurement
• Comparison based on an accepted scale
• Contain a number AND a unit
2. Scientific Notation
• Technique used to express very large or very small numbers
• Based on powers of 10

ex 3.6 x10e-4
3. Kilo (symbol, value, SN)
• k
• 1,000
• 10e3
4. Centi (Symbols, value, SN)
• c
• 0.01
• 10e-2
5. Milli (Symbol, value, SN)
• m
• 0.001
• 10e-3
6. When do you use 10e0?
When the number in question already has only 1 digit left to the decimal

7.31 -> 7.31x10e0
7. 1 inch equals
2.54cm (exactly)
8. Volume
Amount of three-dimensional space

SI unit = m3
9. Volume of gas and liquid are commonly measured in what unit?
mL
10. What does 1mL equal?
1cm3

1mL = 10-3L = 0.001L
11. Mass
Amount of matter present

SI unit=kg

1kg = 103g = 10000g
12. 1kg = how many lbs?
1kg = 2.2046lbs
13. 1lb = how many grams?
453.59grams
14. Uncertainty in Measurement
A measurement always has some uncertainty
15. Significant Figures
• Used to indicate the uncertainty of a measurement
• Measurements are report with one(last) uncertain digit
• + or - 1
16. Exact numbers
• Numbers known with certainty
• Have unlimited number of SFs

• 1min=60 seconds
• Number of people in a room
17. Multiplying and dividing with SFs
• Result has the same number of SFs as the measurement with the smallest number of SFs
• Count SFs and round off to the correct SF
You take the largest AU (uncertainty) and apply that to the answer
19. 1lb =
16oz
20. Kelvin to Celsius conversion equation
Tc = Tk - 273.15
21. Ferinheight to Celsius conversion equation
T= (TF - 32.00)/1.80
22. Celsius to Ferinheight equation
TF = 1.80(Tc) +32.00
23. Celsius to Kelvin equation
TK= TC + 273.15
24. When converting how do you count SFs
Report converted temp to the same amount of uncertainty as the original term
25. Density
• A property of matter representing the mass per unit vol
• A conversion factor between mass and volume

Density = Mass/Volume
26. SI units for density (solid, liquid, gas)
• Solids - g/cm3
• Liquids - g/mL
• Gasses- g/L
 Author: michaelirby98 ID: 261840 Card Set: Measurements and Calculation Updated: 2014-02-16 21:30:13 Tags: Chemistry Folders: Chemistry Description: Chap 2 Show Answers: