Ch. 1, 2, & 25 measurement, atoms, molecules, & organic chem. **test** AP Chem

For problems involving calculations, show the relevant equation (or formula and conversion factor(s)), show your work in an organized manner, put the proper units in your calculations / answer, and have the proper number of significant figures in your answer. [90 points]

1. fill-in the blank; need not show work. [6 points]

a. 5.12 + 7.376 = _________

b. 38.6 ÷ 1.7 = _____________

_______________

2. fill-in the blank; show your work. [15 points]

a. 17

.4 mm = __ cmb.

c. 57

.85 km^{2}= __ m^{2}

3. What is the radius of a 3.1 g copper sphere ? The density of copper is 8.94 g / cm^{3} and the volume of the sphere is (4 / 3) Π r^{3}. [9 points]

4. fill-in the table. [10 points]

symbol

# protons

# neutrons

# electrons

charge

Atomic mass

^{65}Cu^{2+}

47

+ 1

110

5. A hypothetical sample of carbon contains 75**.**0 % ^{12}C, 10**.**0 % ^{13}C, and an unknown amount of ^{14}C. Based on this information, determine the average atomic mass of carbon. [10 points]

6. fill-in the table. [10 points]

Chemical name

Chemical formula

Fe(OH)

_{3}Barium nitrate

P

_{3}Cl_{8}Ammonium sulfate

S

_{4}Br_{6}

7. sketch the structural formula of 5 isomers of hexane. [10 points]

8. sketch the structural formula of: trans-3-, 4- dimethyl-3-hexene. [5 points]

9. sketch the structural formula of an example of ____. [15 points]

a. aldehyde b. ester c. carboxylic acid