test [80 points] Honors Chemistry date: _____________

 

Ch. 3 & 11 atom, molecule, & atomic structure

 

1. Determine the average atomic mass of carbon based on the following hypothetical data: [show your work, including any equation / formula used to solve the problem; 10 points]

test [80 points] Honors Chemistry date: _____________

Ch. 3 & 11 atom, molecule, & atomic structure

1. Determine the average atomic mass of carbon based on the following hypothetical data: [show your work, including any equation / formula used to solve the problem; 10 points]

isotope

Abundance

12C

85 %

13C

10 %

14C

5 %

 

2. fill-in the below table. [22 points]

symbol

Atomic mass

# protons

# neutrons

# electrons

Charge

141La 3+

 

 

 

 

 

 

20

 

12

 

- 2

 

90

38

 

36

 

 

3. Write the chemical formula of an ionic compound containing: [8 points]

a. aluminum and sulfur

b. fluorine and barium

c. potassium and nitrogen

d. strontium and chlorine

 

4. Identify the atoms (by their chemical name, not symbol) and the number of such atoms in the following compounds. [10 points]

a. Ca3(PO4)2 contains

b. CH3(CH2)2OH contains

c. H 2N – CH(C6H5OH) – COOH contains

5. What is the electron configuration and orbital diagram of: [20 points]

a. sulfur

b. arsenic

 

6. Which atom, chlorine or iodine, has a larger 1 st ionization energy ? Rationalize your answer. [10 points]