1. List the number of significant figures in the following numbers. (4 pts)
                  A. 100 km
                  B. 2.9374 µg
                  C. 704 mm Hg
                  D. 340.0 ^oC

2. Definitions (2 pts each)
                  A. ____________________ is how close a measurement is to the "true value"
                  B. Precision-

2. What is the difference between a hypothesis and a law? (2 pts)

1. What is the density of a 7.53 cm³ rock which has a mass of 5.322 g? Express your answer in the correct number of significant figures. (4 points)

2. Convert 0.0000171 to scientific notation. (2 points)

3. A filled box weighs 12 pounds. How many kilograms is this? Use the conversion factor of 1 pound = 454 g as an exact number. (4 points)

1. What are the subatomic particles we have discussed and what are their physical properties? (6 points)

2. Describe the location of metals and nonmetals on the periodic table. (2 points)

3. How many neutrons are in an atom of ⁵⁶Fe? (2 points)

1. What is the difference between a cation and an anion? (3 points)

2. State the periodic law. (3 points)

3. What is the formula unit for the interaction of aluminum and fluorine? (4 points)

1. Classify the following molecules as polar or nonpolar. (4 points)
                  OFH
                  CH₂Cl₂
                  CF₄
                  CH₄

2. Using a chart of electronegativities, determine the type of bond involved between the following pairs of elements. (4 points)
                  C-H
                  C-Cl
                  N-H
                  Na-Cl

3. What is the molecular shape of BF₃? (2 points)

1. Determine the oxidation state of the underlined atom in the following molecules. (2 points)
                  K₂Cr₂O₇ 
                  SO₄^2-

2. Balance the following equation. (4 points)
                  C₈H₁₈ (l) + O₂ (g) ----> CO₂ (g) + H₂O (g)

3. In the following balanced equation, identify the (a) oxidizing agent (b) reducing agent (c) oxidized atom and (d) reduced atom (4 points)
                  C₃H₈ + 5 O₂ ----> 3 CO₂ + 4 H₂O

4. How many molecules are in 1 mol of OFH? (1 bonus point)

1. What is a limiting reagent? (2 points)

2. Calculate the formula weight of the following molecule. What is the molar mass of this molecule. Include units on your answers. (3 points)
                  C₈H₁₈

3. If I need 1.5 moles of H₂O, how many grams of water do I measure out? (3 points)

4. How many moles are in 13.5 g of a molecule having a molar mass of 32.0? (2 points)

1. What is the units for specific heat? (2 points)

2. Explain the following postulate of the KMT: As the temperature increases, so does the kinetic energy of the particles. (3 points)

3. Describe a liquid in terms of the KMT. (2 points)

4. Indicate which intermolecular forces are present in the following molecules. (3 points)
              London Force      Dipole-Dipole interaction      Hydrogen Bond
CH₄         ____________     ____________                   ____________
CH₂F₂   ____________     ____________                   ____________
PCl₃      ____________     ____________                   ____________

1. Write the formula for the ideal gas law. (3 points)

2. A sample of gas occupies 54.5 L at 45^oC and 745 mm Hg. What volume will the gas occupy if the pressure is decreased to 325 mm Hg and the temperature increases to 87^oC? (5 points)

3. What is STP? What does it stand for and what are the values. (2 points)

1. A solution contains 1.0 mol H₂O, 0.5 mol sucrose, and 0.005 mol ß-mercaptoethanol. What is the solvent? (2 points)

2. Predict the solubility of the following compounds in water. (5 points)
                  NCl₃
                  C₁₀H₂₂
                  PbF₂
                  Fe(NO₃)₂
                  CH₃COO^-NH₄⁺

3. What is the molarity of a solution composed of 44.2 g MgCl₂·7 H₂O in 500.00 mL distilled water? (3 points)

1. Indicate the ions the following acid dissociates into. (2 points)
                  H₂CO₃

2. Name the following acids and bases. (4 points)
                  NH₃
                  Al(OH)₃
                  H₂CO₃
                  HF

3. In the following reaction, indicate the acid, the base, the conjugate acid and the conjugate base. (4 points)
                  H₂CO₃ + KOH -----> KHCO₃ + H₂O