ap chemistry. review si system -know prefixes in blue on pg 10 mass vs weight-an object’s mass...
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AP CHEMISTRY
Chapter 1Chemical Foundations
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Review
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Review•SI system -know prefixes in blue on pg 10
•Mass vs weight-an object’s mass reflects the amount of matter it contains. An object’s weight is the pull of gravity on that matter.
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UncertaintyMeasurements should include all certain digits
plus the first uncertain digit.Ex. Reading thermometer, buret, balance, etc.(On digital devices, the last digit shown is
uncertain)So what is the reading from this graduated cylinder? How many decimals are acceptable here?
The reading should be 52.8 ml where the 8 is the estimated digit.
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You should be able to use and read these pieces of equipment.
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Accuracy and
PrecisionWhich is which??
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How Many Significant figures? 4.0023 4.00 0.04003 0.04 0.040
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Sig. Figs in Calculations: A Review •significant figures in calculations• When multiplying or dividing, use the smallest total
number of sig. figs.• When adding and subtracting, use the smallest number of
decimal places.
Ex. 3.0×6.00 = 18 3.0 + 6.00 = 9.0•exact numbers-have infinite sig. figs.
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Use of decimal point or scientific notation to show limit of significant figures. Ex. 600. or 6.00×102
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Dimensional analysis- This should be a review of Chemistry I -conversions are found in
Appendix 6, pg. A26
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In AP Chemistry, we will only use Celsius and Kelvin temperature units
0°C = 273.15K
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Review: Density = Mass/Volume Units are g/cm3 for solids or
liquids and g/L for gases. The density of a substance is a
physical property of the substance and can be used to identify it.
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This may look like a middle school review, but do you really understand it all? Make sure that you do!
Classification of Matter
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Physical, Chemical, and Ambiguous ChangesIn a physical change, the chemical formula
does not change. All phase changes are physical changes.
In a chemical change, one or more new substances are formed.
Sometimes the determination as to whether a change is physical or chemical is not so simple and the change is termed “ambiguous”. An example could be an ionic compound dissolving in water. Weak chemical bonds form between the water molecules and the dissolved ions.
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When a calcium ion dissolves in water, what type of change has occurred?
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Separation of Mixtures
-distillation-chromatography-filtration
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Gravity Filtration Vacuum Filtration
Types of Filtration used in AP Chemistry
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ChromatographyChromatography is a procedure that
separates a mixture into its component parts based on the components attraction for the mobile and stationary phases. The distance that the component travels is compared to the distance that the mobile (solvent) phase travels on the stationary phase.
Types of chromatography:PaperGasThin-layer Liquid
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Paper Chromatography