CHM113 FINAL EXAM (UNIVERSITY
OF MIAMI) LATEST EXAM 2026 WITH
QUESTIONS AND VERIFIED CORRECT
ANSWERS | ALREADY GRADED A+ |
GUAANTEED SUCCESS | CHM 113
LATEST EXAM 2026
Why is the adipic acid brown to start with? - ANSWER-The brown color is
from the impurities. These can be absorbed with activated charcoal.
What happens to the melting point of a substance when it has impurities? -
ANSWER-The melting point is lowered because the impurities interrupt the
normal intermolecular forces that keep the crystals together.
How do you purify adipic acid? - ANSWER-Make a solution of 20 g apipic acid
and 75 mL of distilled water. Boil. Once the adipic acid is dissolved, remove
from the hot plate. Add a small amount of activated charcoal. Pour the solution
through a funnel that has a fluted filter paper in it. Let cool. Place a beaker
containing the filtrate into an ice bath. Filter again. Wash the crystals with cold
distilled water. Let crystals dry. Weigh the crystals to find how much you
recovered. Use MelTemp to find the melting point of your crystals. How close
the melting point is to the literature value will show you how pure your
recovered crystals are.
Why did you use fluted filter paper instead of normal filter paper? - ANSWER-
To increase the surface area.
, How do you calculate percent recovery? - ANSWER-(weight of pure adipic
acid/ weight of crude adipic acid)x100
What is qualitative analysis? - ANSWER-What compounds or elements are
present in the substance.
What is quantitative analysis? - ANSWER-How much of a particular compound
or element is present in the substance.
Are we doing qualitative or quantitative analysis? - ANSWER-Quantitative
since we already know what's in everything
Write the reaction between sulfuric acid and barium hydroxide - ANSWER-
Ba^2+(aq)+2OH-(aq)+2H+(aq)SO4^2-(aq)--->BaSO4(s)+2H2O(l)
What has to happen for gravimetric analysis to work? - ANSWER-1. The
compound formed must be pure and of known stoichiometry.
2. The precipitation reaction must be virtually complete, that is, the yield of the
solid product should be 99.9% or better.
3. The precipitation reagent should be specific for the sample being determined.
4. The solid that is precipitated should form reasonably large, well-formed
crystals.
5. The molecular weight of the precipitated solid should be high enough that a
reasonable weight of precipitate is generated even when the weight percent of
substance being determines is low in the unknown sample.
What does flocculate mean? - ANSWER-cause to aggregate into a mass
The Chemistry Department enforces a _____ _______ policy regarding lab
safety violations. - ANSWER-zero tolerance
OF MIAMI) LATEST EXAM 2026 WITH
QUESTIONS AND VERIFIED CORRECT
ANSWERS | ALREADY GRADED A+ |
GUAANTEED SUCCESS | CHM 113
LATEST EXAM 2026
Why is the adipic acid brown to start with? - ANSWER-The brown color is
from the impurities. These can be absorbed with activated charcoal.
What happens to the melting point of a substance when it has impurities? -
ANSWER-The melting point is lowered because the impurities interrupt the
normal intermolecular forces that keep the crystals together.
How do you purify adipic acid? - ANSWER-Make a solution of 20 g apipic acid
and 75 mL of distilled water. Boil. Once the adipic acid is dissolved, remove
from the hot plate. Add a small amount of activated charcoal. Pour the solution
through a funnel that has a fluted filter paper in it. Let cool. Place a beaker
containing the filtrate into an ice bath. Filter again. Wash the crystals with cold
distilled water. Let crystals dry. Weigh the crystals to find how much you
recovered. Use MelTemp to find the melting point of your crystals. How close
the melting point is to the literature value will show you how pure your
recovered crystals are.
Why did you use fluted filter paper instead of normal filter paper? - ANSWER-
To increase the surface area.
, How do you calculate percent recovery? - ANSWER-(weight of pure adipic
acid/ weight of crude adipic acid)x100
What is qualitative analysis? - ANSWER-What compounds or elements are
present in the substance.
What is quantitative analysis? - ANSWER-How much of a particular compound
or element is present in the substance.
Are we doing qualitative or quantitative analysis? - ANSWER-Quantitative
since we already know what's in everything
Write the reaction between sulfuric acid and barium hydroxide - ANSWER-
Ba^2+(aq)+2OH-(aq)+2H+(aq)SO4^2-(aq)--->BaSO4(s)+2H2O(l)
What has to happen for gravimetric analysis to work? - ANSWER-1. The
compound formed must be pure and of known stoichiometry.
2. The precipitation reaction must be virtually complete, that is, the yield of the
solid product should be 99.9% or better.
3. The precipitation reagent should be specific for the sample being determined.
4. The solid that is precipitated should form reasonably large, well-formed
crystals.
5. The molecular weight of the precipitated solid should be high enough that a
reasonable weight of precipitate is generated even when the weight percent of
substance being determines is low in the unknown sample.
What does flocculate mean? - ANSWER-cause to aggregate into a mass
The Chemistry Department enforces a _____ _______ policy regarding lab
safety violations. - ANSWER-zero tolerance
