Unit 4: Chemical Reactions
Chemistry · Unit 4 · Paper 2

Chemical Reactions unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 17 terms and is the same for everyone, so a teacher can assign “Unit 4, Paper 2” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 31 min 28 points0/17 attempted
1

Precipitation reaction

2

Limiting reactant

3

Acid-base neutralization

4

Net ionic equation

5

Identifying reaction type

6

Gravimetric analysis

7

Titration

8

Percent yield

9

Back titration

10

Balancing redox in acid

11

Redox identification

12

Equivalence vs endpoint

Short answer 1. Define or explain: Oxidation number rules

3 pts

Short answer 2. Define or explain: Titration calculation

3 pts

Short answer 3. Define or explain: Solubility rules

3 pts

Short answer 4. Define or explain: Stoichiometry road map

3 pts

Free response

4 pts

A student needs to prepare 250.0 mL of 0.400 M NaOH solution from a stock solution of 2.00 M NaOH.

(a) Calculate the volume of stock solution required.

(b) Describe the procedure the student should follow to prepare the solution, including the glassware used.

(c) The student accidentally adds 30.0 mL of stock solution instead of the calculated volume, then dilutes to 250.0 mL. Calculate the actual concentration of the resulting solution.

(d) Explain why adding water to the volumetric flask before adding the stock solution would not change the final concentration, provided the final volume is correct.