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 = __ cm

b.

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 / cm3 and the volume of the sphere is  (4 / 3) Π r3. [9 points]

 

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

symbol

# protons

# neutrons

# electrons

charge

Atomic mass

65Cu 2+

 

 

 

 

 

 

47

 

 

+ 1

110

5. A hypothetical sample of carbon contains 75.0 % 12C, 10.0 % 13C, and an unknown amount of 14C. 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

 

 

P3Cl8

Ammonium sulfate

 

 

S4Br6

 

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