1. Ch. 2 and 3 Measurement Law of conservation of mass SI units density

2. Chemical Symbols When writing the chemical symbol for an element, the first letter is always capitalized, and the second letter (if there is one) is always lower case.

3. Chemical Equations Reactants  Products Reactants are what goes into the reaction  means yields or produces Products are what result from a chemical reaction

4. Law of Conservation of Mass Mass of reactants equals the mass of the products, because mass cannot be created or destroyed by chemical reactions (only nuclear reactions) Ex. If 25 grams of aluminum react with 5 grams of oxygen, how many grams of aluminum oxide are produced?

5. SI Units Quantity Base Unit Abbrev. Length Mass Volume Temp meter kilogram cubic centimeter kelvin m kg cm 3 K Symbol l m v T

6. Selected Prefixes for Metric Units mega-M10 6 deci-d10 -1 centi-c10 -2 milli-m10 -3 PrefixSymbolFactor micro-  10 -6 nano-n10 -9 pico-p10 -12 kilo-k10 3 BASE UNIT - - - 10 0

7. Density The ratio between the object’s mass and its volume.

8. Density Density = Density is a characteristic (physical) property that depends only on the composition of a substance, not on the size of the sample. – The composition of a mixture can vary therefore the density can vary. D = D = MVMV Mass Volume

9. Density Mass (g) Volume (cm 3 )

10. DENSITY PRACTICE PROBLEM A copper penny has a mass of 3.1g and a volume of 0.35 cm 3. What is the density of copper? Density = mass volume Density = 3.1g 0.35 cm 3 = 8.8571 g/cm 3 = 8.9 g/cm 3