1. Chemistry Final
Review Session 1 - May 5, 2011

2. Density
Density = Mass/Volume

3. What is the density of salt water?
Density Graph
What is the density of salt water?

4. 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

5. Mixtures, compounds
What is the difference between a mixture and a compound?

6. Chemical vs physical changes
Physical change = no change in composition
Chemical change = change in chemical composition

7. SI system Be able to convert between units
milli, centi, deci, deca, kilo, etc.
meters, kilograms, liters,

8. Ways to separate mixtures
Physical means of separating mixtures
Distillation
Filtration
Chromatography (pass mixture through a physical medium - smallest molecules travel farthest, etc.)

9. 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

10. Nomenclature - IOnic
MgCl2
NaNO3
Fe2O3
FeO
NaC2H3O2

11. 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?

12. Covalent nomenclature
H2O NO
SO2
CSe2

13. 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?

14. Percent composition
What is the percent composition of Carbon in CO2?

15. 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.

16. 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

17. Molecular formula
The simplest formula for vitamin C is C3H4O3. Experimental data indicates that the molecular mass of vitamin C is about What is the molecular formula of vitamin C?

18. BAlancing equations Balance the following equations:
____ Na3PO4 + ____ KOH ____ NaOH + ____ K3PO4
____ Na3PO4 + ____ CaCl2 ____ NaCl + ____ Ca3(PO4)2
____ CH4 + ____ O2 ____ CO2 + ____ H2O

19. Types of reactions A + B --> AB AB --> A + B
AB + C --> CB + A
AB + CD --> AD + CB
Hydrocarbon + O2 --> CO2 + H2O + heat