1. Review

2. 1. Give a method that would separate each mixture:
a. sand and baking soda c. the components of ink
Dissolve baking soda Use Chromotography
in water and use filter
b. alcohol and water d. iron filings and salt
 Boil off the alcohol Use a magnet to remove iron

3. 2. Name the 7 elements that exist as diatomic molecules when pure:
Bromine, Iodine, Nitrogen, Chlorine, Hydrogen, Oxygen Fluorine

4. 3. Do all elements have the same number of atoms per mole. Yes Explain
3. Do all elements have the same number of atoms per mole? Yes Explain. The mole is a defined number, like a dozen. 6.02x1023

5. 4. Identify these properties as intensive or extensive:
a. boiling point – intensive
b. density - intensive
c. conductivity - intensice
d. solubility in water - intensive
e. mass - extensive
f. volume - extensive
g. color - intensive
h. heat content - extensive
i. melting point - intensive

6. 5. Processes in nature move toward low energy and high entropy.

7. 6. The basic unit of an element is the atom and the basic unit of a compound is the molecule.

8. 7. There are 3 major differences between mixtures and compounds
7. There are 3 major differences between mixtures and compounds. They are:
1. Compounds are bonded together
2. elements in a compound do not retain their properties.
3. Componds have a definite composition.

9. 8. Describe how you would separate a mixture of sand and sugar.
Mix with water.
Sugar will dissolve.
Filter out the sand.

10. 9. Co represents Cobalt and CO represents Carbon Monoxide.

11. 10. Distinguish between an exothermic and an endothermic process
10. Distinguish between an exothermic and an endothermic process. Give an example of each.
Exothermic – heat exits or leaves the reaction – a lit match
Endothermic – heat enters the reaction – a chemical cold pack

12. b. Name three kinds of materials that are homogeneous.
11. a. What does homogeneous mean? The same throughout, evenly distribution
b. Name three kinds of materials that are homogeneous.
Solutions, alloys, amalgams

13. 12. Identify each of the following as a physical (P), chemical (C) or nuclear (N) change:
sulfur dissolves in carbon disulfide P f. milk sours C
a needle is magnetized P g. uranium decays into thorium N
limestone is crushed P h. steam is formed from water P
carbon transformation into nitrogen N i. copper conducts electricity P
food is cooked C j. an alloy, sterling silver, is formed P

14. 13. Define: Available in the notes
Entropy -
substance
kinetic energy and potential energy
element
compound
solvent
solute
amalgam

15. 14. Give 4 indications that a chemical change is taking place
1. production of a gas
2. Production of a solid(precipitate)
3. Production of heat and light
4. Color Change

16. 15. Name these elements:
Fe - Iron Mn - Manganese
Ra - Radium Pt Platinum Cs - Cesium

17. 16. Give the symbol:
mercury sodium tin scandium gold
Hg Na Sn Sc Au
phosphorus calcium strontium copper silver
P Ca Sr Cu Ag

18. 17. Classify as a heterogeneous mixture, element, compound, or solution (homogeneous mixture).
a. nitrogen element
b. 14k gold jewelry homogeneous mixtures
c. brass homogeneous mixture
d. beef stew heterogeneous mixture
 e. air homogeneous mixture
f. antimony element
g. sodium chloride compound
h. dental amalgam homogeneous mixture

19. 18. Draw a warming curve for lead, which has a melting point of 327
18. Draw a warming curve for lead, which has a melting point of C and a boiling point of 1740C.

20. 19. Give the percent composition of Ca(NO3)2

21. 20. Perform the following mole calculations 95.3 grams
Determine the number of grams in 3.92 moles of magnesium
  95.3 grams
Determine the number of moles in g of oxygen gas.
 3.9 moles
How many atoms are in 4.6 moles of calcium?
 2.8 x 1024
Change 23.8 grams of NH3 into number of molecules.
8.43 x 1023

22. What is the mass in grams of 1.34 x 1024 atoms of zinc?
 146 grams
What is the mass of 1 atom of tungsten in grams?
 3.05 x 10-22
How many atoms oxygen are in 97.0 grams of carbon dioxide, CO2?
 2.65 x 1024 
How many calcium ions are in a 100. gram sample of calcium phosphate, Ca3(PO4)2?
5.82 x 1023

23. Larry and Louise performed the water experiment with these results:
mass of cup with water g
mass of cup and water after sipping g
  Calculate the number of molecules of water in the sip.
7.4 x 1023

24. Extra: A drop of water containing 3.4 x 1021 molecules evaporates in 5.5 hours. How many molecules are evaporating per second?
1.7 x 1017