Chemistry Final Review Session 1 - May 5, 2011. Density Density = Mass/Volume.
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Transcript of Chemistry Final Review Session 1 - May 5, 2011. Density Density = Mass/Volume.
![Page 1: Chemistry Final Review Session 1 - May 5, 2011. Density Density = Mass/Volume.](https://reader036.fdocuments.in/reader036/viewer/2022062518/56649e8e5503460f94b91f7d/html5/thumbnails/1.jpg)
Chemistry FinalReview Session 1 - May 5, 2011
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Density
• Density = Mass/Volume
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Density GraphWhat is the density of salt water?
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Precision vs accuracy
• accuracy = how close a result is to the ACTUAL value
• precision = how close together a set of results are to one another
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Mixtures, compounds
• What is the difference between a mixture and a compound?
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Chemical vs physical changes
• Physical change = no change in composition
• Chemical change = change in chemical composition
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SI system
• Be able to convert between units
• milli, centi, deci, deca, kilo, etc.
• meters, kilograms, liters,
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Ways to separate mixtures
• Physical means of separating mixtures
• Distillation
• Filtration
• Chromatography (pass mixture through a physical medium - smallest molecules travel farthest, etc.)
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How to draw a graph
• Descriptive Title
• Scale for maximum coverage of graph area
• Set Origins for maximum expression of data features
• Axis Labels with Units
• Points clearly indicated
• Smooth curve, not dot-to-dot
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Nomenclature - IOnic
• MgCl2
• NaNO3
• Fe2O3
• FeO
• NaC2H3O2
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Writing compounds
• You have an ionic compound of Aluminum and the polyatomic ion sulfate. What is the correct formula?
• What is the correct formula for Calcium Oxide?
• What is the correct formula for Cu(II) Hydroxide?
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Covalent nomenclature
• H2O
• NO
• SO2
• CSe2
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Moles
• How many moles of Oxygen atoms in 3 moles of water?
• What is the molar mass of CO2? C6H12O6?
• How many atoms in 3 moles of B2O3?
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Percent composition
• What is the percent composition of Carbon in CO2?
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Empirical formula
Butyric acid gets its name from the Latin "butyrum", meaning butter, and is the compound in rancid butter that gives it its terrible smell. A 2.50 g sample of butyric acid was found to consist of 1.36 g carbon, 0.23 g hydrogen, and 0.91 g oxygen. Find its empirical formula.
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Empirical formula
• Natural gas is a mixture of several hydrocarbons, but is primarily methane. Find the empirical formula of this important natural resource if its composed of 74.8% carbon and 25.2% hydrogen
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Molecular formula
• The simplest formula for vitamin C is C3H4O3. Experimental data indicates that the molecular mass of vitamin C is about 180. What is the molecular formula of vitamin C?
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BAlancing equations
• Balance the following equations:
• ____ Na3PO4 + ____ KOH ____ NaOH + ____ K3PO4
• ____ Na3PO4 + ____ CaCl2 ____ NaCl + ____ Ca3(PO4)2
• ____ CH4 + ____ O2 ____ CO2 + ____ H2O
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Types of reactions
• A + B --> AB
• AB --> A + B
• AB + C --> CB + A
• AB + CD --> AD + CB
• Hydrocarbon + O2 --> CO2 + H2O + heat