MTL 200 LAB 4 LEAD-TIN PHASE DIAGRAM
FINAL TEST 2026 QUESTIONS WITH
CORRECT ANSWERS GRADED A+
◍ Identify the number of amino acids that matches each description..
Answer: The number of amino acids that exist in the human genetic
codeNatural amino acids- 20The number of amino acids that humans require
through dietEssential amino acids - 9The number of amino acids that can be
made by the human bodyNonessential amino acids - 11
◍ Aspirin can be prepared from salicylic acid (C7H6O3CX7HX6OX3), which
has a molar mass of 138.12 g/mol, and acetic anhydride
(C4H6O3CX4HX6OX3), which has a molar mass of 102.04 g/mol. The
density of acetic anhydride is 1.082 g/m
L.
C7H6O3+C4H6O3 C9H8O4+C2H3O2CX7HX6OX3+CX4HX6OX3 CX9HX8OX
is the theoretical yield, in grams, of aspirin (C9H8O4CX9HX8OX4), which
has a molar mass of 180.15 g/mol, possible when reacting 3.23 g of salicylic
acid with 3.60 mL of acetic anhydride? Synthesis of Aspirin Quiz.
Answer: 4.21
◍ What effect do restriction enzymes have on DNA?.
Answer: Restriction enzymes cleave DNA at specific sequences into
fragments.
◍ A rigid polymer used often in construction materials. The structure contains
a halogen..
Answer: Polyvinyl chloride
◍ Rinse the glassware with organic solvents after the experiment..
Answer: Many organic chemicals do not dissolve in water.
, ◍ Identify the name for the molecule pictured. - see photos.
Answer: 1-butanoic acid
◍ What property is used to separate DNA fragments during a gel
electrophoresis experiment?.
Answer: Size
◍ What is a protease?An enzyme that breaks down a protein into individual
amino acidsA protein consisting of a chain of amino acidsA component of
foods such as fruit juicesAll of the above are correct..
Answer: All of the above
◍ A reagent added to the analyte solution that changes color when the reaction
is completeWhen the required amount of one solution has been added to the
second solution to complete the reactionGlassware that allows a solution to
be precisely and slowly added to another solution.
Answer: Indicator Endpoint Buret
◍ Suppose you are going to perform a TLC experiment, which materials will
you use to prepare the TLC development chamber?.
Answer: BeakerFilter paperWatch glass
◍ Use the phase diagram below. A copper-nickel alloy (53 wt% Ni and 47
wt% Cu) is 1) heated to 1400 C, and then 2) rapidly cooled to 1300 C and
keep at this temperature for long enough time to reach to an equilibrium
condition; and then 3) the temperature is quenched to room
temperature.What is the composition of the phase/s after process 3?.
Answer: core shaped α-solid: 58 wt% Ni-42 wt% Cu; random shaped
α'-solid: 45 wt% Ni-55 wt% Cu.
◍ Identify the expected result of the iodine test with different carbohydrates..
Answer: Glucose - No reactionSucrose -No reactionStarch -Color
changeAmylopectin - No reaction
◍ If boron is diffused into a thick slice of silicon with no previous boron in it
at a temperature of 1100 C for 5 hrs, what is the depth below the surface at
FINAL TEST 2026 QUESTIONS WITH
CORRECT ANSWERS GRADED A+
◍ Identify the number of amino acids that matches each description..
Answer: The number of amino acids that exist in the human genetic
codeNatural amino acids- 20The number of amino acids that humans require
through dietEssential amino acids - 9The number of amino acids that can be
made by the human bodyNonessential amino acids - 11
◍ Aspirin can be prepared from salicylic acid (C7H6O3CX7HX6OX3), which
has a molar mass of 138.12 g/mol, and acetic anhydride
(C4H6O3CX4HX6OX3), which has a molar mass of 102.04 g/mol. The
density of acetic anhydride is 1.082 g/m
L.
C7H6O3+C4H6O3 C9H8O4+C2H3O2CX7HX6OX3+CX4HX6OX3 CX9HX8OX
is the theoretical yield, in grams, of aspirin (C9H8O4CX9HX8OX4), which
has a molar mass of 180.15 g/mol, possible when reacting 3.23 g of salicylic
acid with 3.60 mL of acetic anhydride? Synthesis of Aspirin Quiz.
Answer: 4.21
◍ What effect do restriction enzymes have on DNA?.
Answer: Restriction enzymes cleave DNA at specific sequences into
fragments.
◍ A rigid polymer used often in construction materials. The structure contains
a halogen..
Answer: Polyvinyl chloride
◍ Rinse the glassware with organic solvents after the experiment..
Answer: Many organic chemicals do not dissolve in water.
, ◍ Identify the name for the molecule pictured. - see photos.
Answer: 1-butanoic acid
◍ What property is used to separate DNA fragments during a gel
electrophoresis experiment?.
Answer: Size
◍ What is a protease?An enzyme that breaks down a protein into individual
amino acidsA protein consisting of a chain of amino acidsA component of
foods such as fruit juicesAll of the above are correct..
Answer: All of the above
◍ A reagent added to the analyte solution that changes color when the reaction
is completeWhen the required amount of one solution has been added to the
second solution to complete the reactionGlassware that allows a solution to
be precisely and slowly added to another solution.
Answer: Indicator Endpoint Buret
◍ Suppose you are going to perform a TLC experiment, which materials will
you use to prepare the TLC development chamber?.
Answer: BeakerFilter paperWatch glass
◍ Use the phase diagram below. A copper-nickel alloy (53 wt% Ni and 47
wt% Cu) is 1) heated to 1400 C, and then 2) rapidly cooled to 1300 C and
keep at this temperature for long enough time to reach to an equilibrium
condition; and then 3) the temperature is quenched to room
temperature.What is the composition of the phase/s after process 3?.
Answer: core shaped α-solid: 58 wt% Ni-42 wt% Cu; random shaped
α'-solid: 45 wt% Ni-55 wt% Cu.
◍ Identify the expected result of the iodine test with different carbohydrates..
Answer: Glucose - No reactionSucrose -No reactionStarch -Color
changeAmylopectin - No reaction
◍ If boron is diffused into a thick slice of silicon with no previous boron in it
at a temperature of 1100 C for 5 hrs, what is the depth below the surface at
