CHM1046 Lab Final 2026 Exam
Questions with 100% Correct
Answers | Latest Update
Using structural formulas write down the reaction for the formation of an
ester from n-butanoic acid and n-proply alcohol with an acid. State the
ester functional group in the reaction and name the ester. - 🧠ANSWER ✔✔-
C3H7COOH (n-butanoic) + C3H7OH (n-propyl) —> C3H7CO2C3H7 + H2O
- C3H7CO2C3H7 is the ester group, it is called propyl butanoate
,Why is the hydrogen ion shown over the yield arrow in the esterification
process? - 🧠ANSWER ✔✔Because it's not part of the reactants or products
When a chemical substance is shown over the yield arrow what is that
substance called? - 🧠ANSWER ✔✔A catalyst
Using structural formulas, write down the reactions for the formation of
methyl acetate by reacting methanol with acetyl chloride. - 🧠ANSWER
✔✔CH3COOH + CH3OH —> CH3CO2CH3 + H2O
Give the ester structural formulas and names for orange oil and vanilla oil -
🧠ANSWER ✔✔- Orange oil = octylacetate; C8H17CO2CH3
- Vanilla oil = phenolic aldehyde; C2H3COHCHCOHCHOCH3
Why is the test for the presence of phenols carried out in this experiment? -
🧠ANSWER ✔✔Because the presence of phenols can tell you how impure
or pure your product is
How does recrystallization lead to purification of solid materials? -
🧠ANSWER ✔✔It removes the impurities from solid materials
1.02g of acetylsalicylic acid was obtained from 2g. Of salicylic acid y
reaction with 2.0g of acetic anhydride?
, A. What is the limiting reactant?
B. Calculate the theoretical yield.
C. Calculate the percent yield of acetylsalicylic acid. - 🧠ANSWER ✔✔A. 2g
of S. A x 1mol/138g x 180g aspirin =
2.61g aspirin
2g of A. A x 1mol/102g x 180g aspiring = 3.53g aspirin
Limiting reactant is salicylic acid
B. 0.0144moles salicylic acid (2g/138) x 180.158g/mol of acetylsalicylic
acid = 2.61g Aspirin
C. (1.02/2.61) x 100 = 39%
Salicylic acid - 🧠ANSWER ✔✔C7H6O3
Acetic anhydride - 🧠ANSWER ✔✔C4H6O3
Acetylsalicylic acid (Aspirin) - 🧠ANSWER ✔✔C9H8O4
Esters may be saponified by reaction with a strong base. Predict the
products of the reaction CH3CH2CH2CO2CH2CH3 + NaOH (H2O as
catalyst) —> - 🧠ANSWER ✔✔3CH3(CH2)16CO2Na + C3H8O3
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2026. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Questions with 100% Correct
Answers | Latest Update
Using structural formulas write down the reaction for the formation of an
ester from n-butanoic acid and n-proply alcohol with an acid. State the
ester functional group in the reaction and name the ester. - 🧠ANSWER ✔✔-
C3H7COOH (n-butanoic) + C3H7OH (n-propyl) —> C3H7CO2C3H7 + H2O
- C3H7CO2C3H7 is the ester group, it is called propyl butanoate
,Why is the hydrogen ion shown over the yield arrow in the esterification
process? - 🧠ANSWER ✔✔Because it's not part of the reactants or products
When a chemical substance is shown over the yield arrow what is that
substance called? - 🧠ANSWER ✔✔A catalyst
Using structural formulas, write down the reactions for the formation of
methyl acetate by reacting methanol with acetyl chloride. - 🧠ANSWER
✔✔CH3COOH + CH3OH —> CH3CO2CH3 + H2O
Give the ester structural formulas and names for orange oil and vanilla oil -
🧠ANSWER ✔✔- Orange oil = octylacetate; C8H17CO2CH3
- Vanilla oil = phenolic aldehyde; C2H3COHCHCOHCHOCH3
Why is the test for the presence of phenols carried out in this experiment? -
🧠ANSWER ✔✔Because the presence of phenols can tell you how impure
or pure your product is
How does recrystallization lead to purification of solid materials? -
🧠ANSWER ✔✔It removes the impurities from solid materials
1.02g of acetylsalicylic acid was obtained from 2g. Of salicylic acid y
reaction with 2.0g of acetic anhydride?
, A. What is the limiting reactant?
B. Calculate the theoretical yield.
C. Calculate the percent yield of acetylsalicylic acid. - 🧠ANSWER ✔✔A. 2g
of S. A x 1mol/138g x 180g aspirin =
2.61g aspirin
2g of A. A x 1mol/102g x 180g aspiring = 3.53g aspirin
Limiting reactant is salicylic acid
B. 0.0144moles salicylic acid (2g/138) x 180.158g/mol of acetylsalicylic
acid = 2.61g Aspirin
C. (1.02/2.61) x 100 = 39%
Salicylic acid - 🧠ANSWER ✔✔C7H6O3
Acetic anhydride - 🧠ANSWER ✔✔C4H6O3
Acetylsalicylic acid (Aspirin) - 🧠ANSWER ✔✔C9H8O4
Esters may be saponified by reaction with a strong base. Predict the
products of the reaction CH3CH2CH2CO2CH2CH3 + NaOH (H2O as
catalyst) —> - 🧠ANSWER ✔✔3CH3(CH2)16CO2Na + C3H8O3
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2026. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
