Ch. 3, 4   atoms & molecules              test                 [35 points]                   honors Chem

 

For problems involving calculations, show your work in an organized manner, include any relevant equation (or formula).

 

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

 

                                                                                                Signature:  ___________________

 

 

  1. fill-in the below table; compounds might be hypothetical.  [10 points]

 

 

Chemical formula

Chemical name

 

(NH4)2S

 

 

 

 

Sn(C2H3O2)4

 

 

 

 

P3I6

 

 

 

 

 

 

Aluminum oxide

 

 

 

Mercury (I) phosphate

 

 

 

2.  fill-in the below table  [15 points]

 

symbol

# protons

# neutrons

# electrons

charge

mass number

 

90Sr2+

 

 

 

 

 

 

 

 

 

 

28

 

 

 

+ 3

 

 60

 

 

 

 

 

 

86

 

- 3

 

210

 3. calculate the average mass of a bean based on the following hypothetical experimental data.  Express your answer to the nearest thousandths place.  [10 points]

 

Bean type

# beans in sample

# g of a single bean

Lima

20

1.2

Red

50

0.5

Lentil

30

0.05