WARM UP 1.List the steps of the scientific method. 2.Write one sentence about whether theories or laws are better, and why.

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Presentation transcript:

WARM UP 1.List the steps of the scientific method. 2.Write one sentence about whether theories or laws are better, and why.

Measurement Notes Chem II

International System (SI) Basic Units –Length: meter (m) –Mass: gram/kilogram (g/kg) –Time: second (s) –Volume (liquid): liter (L) –Energy: joule (J) –Amount: mole (mol)

International System (SI) Derived Units –Temp: Kelvin (K) K = C° –Area:m 2 –Volume: m 3 –Density: g/cm 3

Metric Prefixes Kilo- (1000x) (km) (nm) Nano- ( ) (dm) Deci- (.1) (cm) Centi- (.01) (mm) Milli- (.001) (µm) Micro- ( ) Base Unit (1)

Precision vs. Accuracy

Significant Figures Display precision Always measure to 1 more decimal place than the instrument is marked for

Significant Figures

WRAP UP 1.Compare and contrast precision and accuracy. 2.Convert 2.6 mL to kL.