1. Scientific Measurement
Adapted from Addison Wesley Chemistry

2. What is the difference between…
Quantitative and Qualitative data and measurements?

3. International System of Measurements (SI)
Qualitative
Quantitative
Descriptive
Nonnumerical
Definite form
Numbers
Units

4. How do you write Scientific Notation?
36,000

5. Scientific Notation
Written as a coefficient and 10 raised to a power (exponent)
3.6 x 104 = 36,000; positive exponent: the # > 1, the decimal will move to the right equal to the number of the exponent.
3.6 x 10-4 = ; negative exponent: the # < 1, the decimal will move to the left equal to the number of the exponent.

6. What’s the difference Between….
Accuracy and Precision?

7. Accuracy, Precision and Error
Accuracy: a measure of how close a measurement compares to the actual or true value
Precision: a measure of how close a series of measurements are to one another
Error = accepted value - experimental value
Percent error = Error/accepted value x 100%

8. Significant figures Count….. Do not count…… All non-zero numbers
Zero’s between non-zero numbers
Zero’s to the right of the non zero numbers with a decimal
Do not count……
Zero’s to the right of a non-zero number without a decimal
Zero’s to the left of a non-zero number with a decimal

9. Sig Figs in calculations
Multiplication/Division: The answer should be written with the least number of significant figures as the numbers being calculated.
Addition/Subtraction: The answer should be written using the numbers being calculated with the least decimal place.

10. What are the SI units for….
Length?
Mass?
Volume?
Density?

11. SI units of measurement
Length: Meter: m
Volume: Liter: L
Mass: Gram: g
Density = mass per volume: g/mL or g/cm3 or g/L
1 mL = 1 cm3
Temperature: Celsius or Kelvin : 0C = Kelvin