Name: ______________________________ date: _____________

 

ch. 9 + 15 Stoichiomety & solutions test [90 points] Chemistry

 

 

answer sheet: multiple-choice questions. Edit-out

 

1. ____ 6. ____ 11. ____

 

 

 

I

II CE*

 

I

 

II CE*

101 ___ ___

T F

___ ___ ___

T F

106 ___ ___

T F

___ ___ ___

T F

102 ___ ___

T F

___ ___ ___

T F

107 ___ ___

T F

___ ___ ___

T F

 

 

 

score: * { ______ - 0.25 * ______ } = _______ ; maximum score = __10__.

[# correct] [# incorrect]

 


Multiple-choice questions: no calculator may be used in this section of the exam.

 

Part A

 

Directions. Each set of lettered choices below refers to the numbered statements or formulas immediately following it. Select the one lettered choice that best fits each statement or formula, and then write your choice on the answer sheet. A choice may be used once, more than once, or not at all in each set.

 

 

 

Part B

 

Directions: Each question below consists of two statements, statement I in the left-hand column and statement II in the right-hand column. For each question, determine whether statement I is true or false and whether statement II is true or false. Then mark the corresponding T or F blank on your answer sheet. Fill in CE only if statement II is a correct explanation of statement I.

 

I

 

II

 

BECAUSE

 

 

BECAUSE

 


Part C

 

Directions: Each of the incomplete statements or questions below is followed by five suggested completions or answers. Select the one that is best for each case and write in the corresponding letter in the blank on the answer sheet.

 

 


Problems: Show your work, include any formula / equation used to get your answer, the proper units in your work / answer, and the proper number of significant figures in your answer. [20 points / problem]

 

 

1. Mix __ grams of KOH and __ mL of water to prepare a 750 mL 25 mM KOH solution.

 

 

 

2. Mix __ mL of a 50 mM HCl solution and __ mL water to prepare 250 mL of a 30 mM HCl solution.

 

 


3. 20.0 g CuCl2 reacts with 10.0 g of Na2CO3 to form ___ g of CuCO3.

 

 

 

4. Excess AgNO3 was added to 10.0 mL NaCl solution, which formed 3.5 g AgCl. What was the [NaCl] in the original solution ?

 

order-r