MTL 200 LAB 4 LEAD-TIN PHASE DIAGRAM
ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
◍ eutectic reaction.
Answer: L -> a + B. That is, the liquid freezes to two solid phases at the
same time
◍ Where you are in phase diagrams deals with:.
Answer: 1. The phases present2. The composition of each phase3. The
relative amounts of each phase4. The microstructure seen using an optical
microscope.
◍ three phases of matter.
Answer: Solid, liquid, gas
◍ Which of the following statements about the bubble point is correct?.
Answer: The bubble point is the temperature at which the first bubble of
vapor starts to form.For a pure liquid, the boiling point and bubble point are
the same.
◍ You are a laboratory technician interning at a major forensic science
institution. You are tasked with separating an unknown mixture containing
different organic compounds. Your supervisor has mentioned that the
components in this mixture seem to be immiscible in water. The best way to
separate these organic compounds is by:.
Answer: Hydrophobicity
◍ Which of these affects the chemical shift of a nucleus relative to a standard?.
Answer: Electrons of nearby atoms
◍ At what point is it time to end a distillation procedure?.
, Answer: When there is a thin film of liquid left in the round-bottom flask.
◍ One popular product that is used in water purification is a filtration straw.
The straw passively removes particulates from contaminated water as the
consumer sucks up water. What property is this product MOST LIKELY
using to remove particulates from contaminated water?.
Answer: Size
◍ Three attributes of a phase.
Answer: composition, structure, and boundary.
◍ What controls which ionized fragments reach the detector at a given time?.
Answer: mass analyzer
◍ There can be many different phases in a single solid. T/F.
Answer: True
◍ mass spectrometer parts.
Answer: mass analyzer, ionization source, detector
◍ Different elements have different amounts of solubility in each other. For
ex, __ can dissolve much more __ than __ can dissolve __..
Answer: Pb Sn, Sn Pb
◍ Liquid-liquid extractions are based on which of the following properties of a
solute?.
Answer: Solubility
◍ Tasks in this lab.
Answer: generate cooling curves for two different alloy compositions (one
known and one unknown). will heat the sample into its liquid state, transfer
it too a cooling chamber, and use a thermocouple to monitor the temperature
as it cools to a solid.
◍ Solubility of one element in another ________ with higher temperature..
Answer: Increases
◍ proeutectic.
Answer: overall alloy composition is less than 18.3 wt% Sn
ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
◍ eutectic reaction.
Answer: L -> a + B. That is, the liquid freezes to two solid phases at the
same time
◍ Where you are in phase diagrams deals with:.
Answer: 1. The phases present2. The composition of each phase3. The
relative amounts of each phase4. The microstructure seen using an optical
microscope.
◍ three phases of matter.
Answer: Solid, liquid, gas
◍ Which of the following statements about the bubble point is correct?.
Answer: The bubble point is the temperature at which the first bubble of
vapor starts to form.For a pure liquid, the boiling point and bubble point are
the same.
◍ You are a laboratory technician interning at a major forensic science
institution. You are tasked with separating an unknown mixture containing
different organic compounds. Your supervisor has mentioned that the
components in this mixture seem to be immiscible in water. The best way to
separate these organic compounds is by:.
Answer: Hydrophobicity
◍ Which of these affects the chemical shift of a nucleus relative to a standard?.
Answer: Electrons of nearby atoms
◍ At what point is it time to end a distillation procedure?.
, Answer: When there is a thin film of liquid left in the round-bottom flask.
◍ One popular product that is used in water purification is a filtration straw.
The straw passively removes particulates from contaminated water as the
consumer sucks up water. What property is this product MOST LIKELY
using to remove particulates from contaminated water?.
Answer: Size
◍ Three attributes of a phase.
Answer: composition, structure, and boundary.
◍ What controls which ionized fragments reach the detector at a given time?.
Answer: mass analyzer
◍ There can be many different phases in a single solid. T/F.
Answer: True
◍ mass spectrometer parts.
Answer: mass analyzer, ionization source, detector
◍ Different elements have different amounts of solubility in each other. For
ex, __ can dissolve much more __ than __ can dissolve __..
Answer: Pb Sn, Sn Pb
◍ Liquid-liquid extractions are based on which of the following properties of a
solute?.
Answer: Solubility
◍ Tasks in this lab.
Answer: generate cooling curves for two different alloy compositions (one
known and one unknown). will heat the sample into its liquid state, transfer
it too a cooling chamber, and use a thermocouple to monitor the temperature
as it cools to a solid.
◍ Solubility of one element in another ________ with higher temperature..
Answer: Increases
◍ proeutectic.
Answer: overall alloy composition is less than 18.3 wt% Sn
