Semester 2 Test 1 Study Guide

Part 1: What to know

-know how to balance equations
-know how to do combining capacity (look at periodic table)
-know how to do moles (6.02 x 10 to the 23rd)
-know how to do density (mean/averaging)
-know textbook context
-know how to find protons, neutrons, and electrons
-know how to analyze graphs and explain graphs
-know scientific notation
-know charges
-know elements and their symbols

Part 2: Practice Quizzes

1. Which gains and which loses electrons in this reaction:
__Cu(s) + __Ag+(aq) --> __Cu2+(aq) +__Ag(s)?
Answer: Cu loses two electrons and Ag gains one.

2. Explain with words the following reaction of propane:
C3H8(propane gas) + O2(g) --> __CO2(g) + H2O(g)
Answer: Propane gas mixes with oxide to form carbon dioxide and water.

3. Zinc is more chemically reactive than copper? True or false?
Answer: True

4. Trends in chemical properties of elements (such as boiling point or ratio of combining with oxygen) do what as you increase atomic numbers?
Answer: Repeat themselves in patterns.

5. Explain the trends in a chemical property graph.
Answer: The graph shows how many times oxygen combines with elements. The graph changes periodically.

6. Naming metals.
    A. Liquid at room temperature and found in nature in cinnabar: Mercury (Hg)
    B. Common in earth's crust: 8%; light enough to put in aircraft: Aluminum (Al)
    C. Used in bullets and to shield radiation; heavy metal; can make you mad: Lead (Pb)
    D. Used in jewelry; non-reactive: Silver (Ag)
    E. Also used in jewelry; discovered in 1848 by Sutter near Sacramento, starting the rush of 300,000        miners, from overseas: Gold (Au).

7. Of the three subatomic particles (protons, neutrons, and electrons) which has the least mass?
- Electrons

8. Which has a neutral charge?
- Neutrons

9. Which has a positive charge?
- Protons

10. NaCl and H2O are both molecular compounds. Is there a difference in how the atoms of each are held together?
- Yes. H2O is a covalent/molecular bond and NaCl is an ionic bond so H2O is stronger than NaCl.

Part 3: Mini Quizzes

11. Physical or Chemical change? Identify each.
      A. Bread rising: Chemical
      B. Metals are shiny: Physical
      C. Iron rusts: Chemical
      D. Milk turns sour: Chemical
      E. Metals can be drawn into a wire (ductile) and is malleable: Physical
      F. Inert noble gases are used in lightbulbs because they are unreactive: Chemical
      G. Metals conduct electricity: Physical
      H. A post-1982 zinc penny is more reactive with skin oils: Chemical

12. From the periodic table, which element has the lowest atomic number?
- Hydrogen (H)

13. How should you classify a substance that has characteristics of both a metal and a nonmetal?
- Metalloid

14. Which property does NOT indicate that a substance is metal? (in other words, indicates that it is instead a nonmetal)
A. Shiny?
B. Conductive?
C. Brittle? Yes!
D. Reacts with acid?

15. Which did you NOT use in the metal or nonmetal lab to determine if something is a metal?
- Combustion

16. If we hit a substance with a hammer and it flattens out instead of shattering, we say it is what?
- Malleable

17. If an atom has 10 protons, how many electrons must it have?
- 10

18. Which is NOT a metal?
A. Al
B. Sn (tin)
C. Zn
D. Sulfur -correct

19. Which of the following is a nonmetal?
A. Carbon-correct
B. Tin
C. Zinc
D. Aluminum

20.Which is not a chemical reaction?
A. Combustion
B. Rusting (oxidizing) of metals
C. Conducting electricity through a wire - correct
D. Heating copper in air so it combines with oxygen to make copper oxide