Ch. 3 & 4 test: chemical symbols & names [50 points] Chemistry date: ________

1. fill-in the below table [16 points]

symbol

# protons

# neutrons

# electrons

Atomic mass

Charge

55 Cr 3+

 

 

 

 

 

 

 

120

82

200

 

2. Write the chemical formula and chemical name of the following ionic compounds containing: [12 points]

a. calcium & nitrate

b. K & OH [charge of ions are not shown – you have to decide upon the charge]

c. Fe 3+& S [charge of S is not shown – you have to decide upon the charge]

3. Identify (by name, not chemical symbol) the atoms and the number of atoms in the following chemicals: [9 points]

a. Na3PO4 contains:

b. CH3CH2OH contains:

c. Co2(SO4)3 contains:

4. Define an isotope, include an example of isotopes in your answer [4 points]

5. Describe the use of the 2-sample (or independent sample or unpaired) t-test. [4 points]

6. fill-in the below table [5 points]

Chemical formula

Chemical name

P3F7

 

B4O8

 

Fe(NO3)2

 

 

Barium sulfate

 

Lithium carbonate