November 22

Adult Education Science

Fall 2010

Stacy Graham, Teacher


Chemical Formulas

  1. How many atoms of hydrogen are in a molecule of table sugar with the chemical formula of C12 H22O11?
  1. List the names of the elements that make up each of following compounds.

CO2 (carbon dioxide)


NH3 (ammonia)

CaCO3 (calcite)

  1. If an atom looses an electron what kind of oxidation number will it have?
  2. What is the sum of the oxidation numbers of the elements in a compound?
  3. What is the oxidation number of aluminum in AlCl3?
  4. The chemical formula for calcium oxide is CaO.  If the oxidation number for calcium is 2+ what it the oxidation number for oxygen?
  1. In general does metal tend to gain electrons or lose electrons?
  2. What determines how many electron an atom will gain, lose, or share when it forms a chemical bond?
  1. How does the work of Niels Bohr relate to writing chemical formulas?
  2. What is a polyatomic ion?

Chemical Reactions

  1. What always happens in a chemical reaction?
  2. What is the law of conservation of matter?
  3. Count the atoms, which of the following equations are chemically balanced?
H2O2 -------- H2O + O2CO + O2-----------CO2Si+O2-----SiO22KClO3-------2KCl + O3N2+H2--------NH3 
  1. What is the difference between oxidation and reduction?
  2. What is a synthesis reaction?
  3. Which of the following are synthesis reactions?
2H2O------2H2 + O2N2 + 2O2------2NO24Al + 3O2------2Al2O3Zn + 2HCl----ZnCl2 + H2CaO + H2O----Ca(OH)2
  1. What is a decomposition reaction?
  2. What is used to decompose water in an electrolysis reaction?
  3. A single replacement reaction always takes place between an element and a_________.
  4. What is a double replacement reaction?
  5. Which of the following reactions are double replacement reactions?
2Al2O3------4Al + 3O2Ca + 2H2O---- Ca(OH)2 + H2AgNO3 + NaBr----AgBr+NaNO3

2Na + Br2---2NaBr

2NaOH + H2SO4-----Na2SO4 + 2H2O  Acids and Bases 
  1. Acids are sometimes called
  2. When they are placed in water, all bases release
  3. Phenolphthalein and bromthymol blue are
  4. If you put a strip of blue litmus paper into a cup of vinegar, the litmus paper will turn
  1. The pH of a neutral solution is
  2. A solution with a pH of 2 is
  3. A neutralization reaction is a reaction between
  4. A reaction between hydrochloric acid and sodium hydroxide produced water and
  5. Electrolytes can conduct electricity when they are dissolved in water because they form
  1. Of the following substances, the one that is a nonelectrolyte is
  2. A_________ always formed in a neutralization reaction.
Sugar is a ____________ because it does not conduct an electric current when it is dissolved in water