CHM1045
Fall 2000
Dr. Michael Blaber

Name_______________________________SS#_________________________

Exam #1 100 points total

Friday September 29 2000

1. For the following substances, state whether they are most likely a pure substance, a heterogenous mixture, or a homogenous mixture (8 points)

a) Tap water

 

b) Beach sand

 

c) Copper wire

 

d) A suspiciously cheap "gold" ring sold at the University center by some guy named "Rainbow"

 

2. Given the following information write the complete chemical symbol (i.e. complete with appropriate superscripts) for each element or ion (8 points)

Number of Neutrons

Number of Electrons

Number of Protons

Symbol

13

12

12

 

19

18

17

 

6

2

5

 

35

27

29

 

3. Given the following chemical symbols for an atom or ion, write down the number of protons, neutrons and electrons (8 points)

Chemical symbol

Number of Protons

Number of Neutrons

Number of Electrons

18O2-

 

 

 

40Ca2+

 

 

 

40Ar

 

 

 

131I-

 

 

 

 

 

4. Write down the chemical formula for an ionic compound of the following combinations of metals and nonmetals (8 points)

a) Sodium and Sulfur

 

 

b) Calcium and Chlorine

 

 

c) Aluminum and Oxygen

 

 

d) Potassium and Bromine

 

 

 

5. Provide the names for the following chemical compounds or ions (8 points)

a) HClO

b) H2SO4

c) IO4-

d) SO42-

 

6. Draw chemical structures (i.e. use lines to indicate bonds between atoms, and show all atoms) for the following organic molecules or functional groups (8 points)

a) Butane

 

 

 

 

 

 

b) Cycloheptane

 

 

 

 

 

 

 

 

 

 

c) Draw an alcohol functional group (use the letter 'R' to represent the organic part(s) of the molecule)

 

 

 

d) Draw a carboxylic acid functional group (use the letter 'R' to represent the organic part(s) of the molecule)

 

7. Determine the percentage by mass of C, H and O in propanol (C3H7OH; or C3H8O) (8 points)

 

 

 

 

 

 

 

 

 

 

 

 

8. If 37.8g of propanol is combusted, how many grams of carbon dioxide is produced? Be sure to include the balanced chemical equation for the combustion of propanol as part of your answer (12 points)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9. If 48.7 grams of magnesium chloride is dissolved in 4.35 L of water, what is the resulting molarity of the magnesium chloride solution? (6 points)

 

 

 

 

 

 

 

 

10. Indicate whether the following ionic compounds are most likely soluble or insoluble in aqueous solution (8 points)

a) NaBr

 

a) NH4OH

 

a) AgCl

 

a) Mg(OH)2

 

11. Write the balanced molecular equation and the net ionic equation for the neutralization reaction between magnesium hydroxide, Mg(OH)2, and hydrochloric acid, HCl (10 points)

 

 

 

 

 

 

 

12. What are the oxidation numbers assigned to the following atoms of each element? (8 points)

a) CH3COOH

 

 

b) ClO-

 

 

c) S8

 

 

d) H2O