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General Chemistry Lab Final Exam, Lab Reports of Chemistry

West Chester University of Pennsylvania (WCUPA)Chemistry

Lab questions for final exam on general chemistry. 2015 SU CHE 111 Final Exam - Confidential

Typology: Lab Reports

2020/2021

Uploaded on 05/11/2021

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2015 SU CHE 111 Final Exam - Confidential
Your Name: Your ID:
# of Questions: 12
Date and Time of Exam Creation: Fri, Jul 24, 2015 @ 11:10:21
Total Exam Points: 160.00
attachment_for_pubExamUID_lnxp114377506216281436XX_11.jpg
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Download General Chemistry Lab Final Exam and more Lab Reports Chemistry in PDF only on Docsity!

2015 SU CHE 111 Final Exam - Confidential

Your Name: Your ID:

# of Questions: 12

Date and Time of Exam Creation: Fri, Jul 24, 2015 @ 11:10:

Total Exam Points: 160.

attachment_for_pubExamUID_lnxp114377506216281436XX_11.jpg

Question #: 1

Which of the following equipment setups would you use for a calorimetry experiment?

A.

B.

C.

D.

Question #: 3

Which of the following provides an appropriate level of eye protection from fumes and splashes for use in the General Chemistry Lab?

A.

B.

C.

D.

Question #: 4

Balance the following chemical reaction by filling in the blank coefficients below with the

smallest possible whole numbers. If the coefficient is 1, enter the number 1.

1 NH 4NO3( s ) โ†’ 2 N 2( g ) + 3 O 2( g ) + 4 H 2O( g )

Question #: 5

Identify the following pieces of laboratory equipment.

Equipment Identity

Question #: 6

A metal cube having a mass of 112 grams is dropped into a graduated cylinder containing

30.00 mL of water. This causes the water level to rise to 39.50 mL. What is the density of

the cube?

A. 2.86 g/mL B. 10.8 g/mL C. 11.8 g/mL D. 3.74 g/mL

Question #: 7

What is the net ionic equation for the reaction between the reagents shown below? magnesium chloride + sodium hydroxide Complete the table shown below with your response.

SubstanceState SubstanceState SubstanceState 1 ( 2 ) + 3 ( 4 ) โ†’ 5 ( 6 ) You do not need to balance the reaction.

Question #: 8 Consider the reactions N 2 H 4 ( l ) + CH 4 O( l ) โ†’ CH 2 O( g ) + N 2 ( g ) + 3 H 2 ( g ) โˆ†H = โ€“ 37 kJ N 2 ( g ) + 3 H 2 ( g ) โ†’ 2 NH 3 ( g ) โˆ†H = โ€“ 46 kJ CH 4 O( l ) โ†’CH 2 O( g ) + H 2 ( g ) โˆ†H = โ€“ 65 kJ The โˆ†H for the overall reaction shown below is 1 kJ/mol. Do not include units in your answer. N 2 H 4 ( l ) + H 2 ( g ) โ†’ 2 NH 3 ( g )

Question #: 9

What is the percent composition of each element in (NH 4 ) 2 S? N: 1 % H: 2 % S: 3 %

Question #: 10

Write a brief procedure on how you would determine the concentration of citric acid (H 3 C 6 H 5 O 3 ) using sodium hydroxide and materials available in the lab. Your reponse will not be saved until you click the "save" icon.

Question #: 11

Salicylic acid (FW = 138.12 g/mol), a reagent used to make aspirin, can itself be produced from oil of wintergreen (methyl salicylate, FW = 152.15 g/mol, d = 1.18 g/mol at 20 ยบC), by reacting it with sodium hydroxide. This reaction is shown below. You measured out 7.14 mL of oil of wintergreen and 9.59 g of sodium hydroxide (FW = 39.997 g/mol). Experimentally, you produced 6.48 g of salicylic acid. What is your percent yield for this reaction? C 8 H 8 O 3 + NaOH โ†’ C 7 H 6 O 3 + NaOCH 3

A. 4.68 %

B. 102 %

C. 56.4 %

D. 84.7 %

2015 SU CHE 111 Final Exam - Confidential

Your Name: Your ID:

# of Questions: 12

Date and Time of Exam Creation: Fri, Jul 24, 2015 @ 11:10:

Total Exam Points: 160.

attachment_for_pubExamUID_lnxp114377506216281436XX_11.jpg

Question #: 1

Which of the following equipment setups would you use for a calorimetry experiment?

A.

B.

C.

โœ“D.

Item Weight: 5.

Question #: 3

Which of the following provides an appropriate level of eye protection from fumes and splashes for use in the General Chemistry Lab?

A.

B.

C.

โœ“D.

Item Weight: 5.

Question #: 4

Balance the following chemical reaction by filling in the blank coefficients below with the

smallest possible whole numbers. If the coefficient is 1, enter the number 1.

1 NH 4NO3( s ) โ†’ 2 N 2( g ) + 3 O 2( g ) + 4 H 2O( g )

  1. 2
  2. 2
  3. 1
  4. 4

Item Weight: 20.

Question #: 5

Identify the following pieces of laboratory equipment.

Equipment Identity

  1. Erlenmeyer flask
  2. test tube brush| tube brush|
  3. watch glass

Item Weight: 25.

Question #: 6

A metal cube having a mass of 112 grams is dropped into a graduated cylinder containing

30.00 mL of water. This causes the water level to rise to 39.50 mL. What is the density of

the cube?

A. 2.86 g/mL B. 10.8 g/mL โœ“C. 11.8 g/mL D. 3.74 g/mL

Item Weight: 5.

Question #: 7

What is the net ionic equation for the reaction between the reagents shown below? magnesium chloride + sodium hydroxide Complete the table shown below with your response.

SubstanceState SubstanceState SubstanceState 1 ( 2 ) + 3 ( 4 ) โ†’ 5 ( 6 ) You do not need to balance the reaction.

  1. Mg+2|Mg^+2|Mg2+|Mg^2+|
  2. aq|aqueous|
  3. OH-|OH^-|
  4. aq|aqueous|
  5. Mg(OH)
  6. s|solid|

Item Weight: 30.

Question #: 8

Consider the reactions N 2 H 4 ( l ) + CH 4 O( l ) โ†’ CH 2 O( g ) + N 2 ( g ) + 3 H 2 ( g ) โˆ†H = โ€“ 37 kJ N 2 ( g ) + 3 H 2 ( g ) โ†’ 2 NH 3 ( g ) โˆ†H = โ€“ 46 kJ CH 4 O( l ) โ†’CH 2 O( g ) + H 2 ( g ) โˆ†H = โ€“ 65 kJ The โˆ†H for the overall reaction shown below is 1 kJ/mol. Do not include units in your answer. N 2 H 4 ( l ) + H 2 ( g ) โ†’ 2 NH 3 ( g )

  1. -18|-18kJ|-18 kJ|-18kJ/mol|-18 kJ/mol|

Item Weight: 5.

Question #: 9

What is the percent composition of each element in (NH 4 ) 2 S? N: 1 % H: 2 % S: 3 %

  1. 41.110%|41.110|41.110 %|41.11|41.11%|41.11 %|
  2. 11.833%|11.833|11.833 %|11.83|11.83 %|11.83%|
  3. 47.057%|47.057|47.057 %|47.06|47.06 %|47.06%|

Item Weight: 15.

Question #: 10

Write a brief procedure on how you would determine the concentration of citric acid (H 3 C 6 H 5 O 3 ) using sodium hydroxide and materials available in the lab. Your reponse will not be saved until you click the "save" icon.

Item Weight: 30.