Chem 101 Midterm and Final Exam Ivy Tech Community
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Midterm Exam
What is chemistry? ---------- Correct Answer ------------ Chemistry is the science that tries to
understand how matter behaves by studying how atoms and molecules behave.
Determine the answer to the following equation with correct number of significant figures:
2.02+8.102-0.0297 =
a. 10.0923
b. 10.09
c. 10.1
d. 10.092
e. none of the above ---------- Correct Answer ------------ B
Which of the following would NOT be considered a correct conversion factor?
a. 1 dozen eggs = 12 eggs
b. 12 eggs = 1 dozen eggs
c. 1 pair of shoes = 1 shoe
d. 100 pennies = 1 dollar
e. 5 cents = 1 nickel ---------- Correct Answer ------------ C
A reaction which forms a solid product is an example of an:
a. oxidation-reduction reaction
b. combustion reaction
c. precipitation reaction
d. gas evolution reaction
e. none of the above ------------ Correct Answer ------------ C
What type of a reaction occurs when potassium metal reacts with fluorine gas?
a. precipitation
b. acid-base neutralization
c. oxidation-reduction
d. gas evolution
e. no reaction ------------ Correct Answer ------------ C
,Considering the following precipitation reaction:
Which compound would not form ions in the complete ionic equation?
a. PbI2
b. KNO3
c. Pb(NO3)2
d. KI
e. All compounds form ions in the complete ionic equation ------------ Correct Answer ------------
A
Which of the following statements about redox reactions is FALSE?
a. Oxidation is the loss of electrons
b. Reduction is the gain of electrons
Correct!
c. A reaction can result in either oxidation or reduction, not both
d. A reaction involving elemental oxygen is a redox reaction
e. All of the above statements are true ------------ Correct Answer ------------ C
What must be supplied for a decomposition reaction to happen?
a. energy
b. heat
c. electrical current
d. light
e. any of the above ------------ Correct Answer ------------ E
Considering the following precipitation reaction:
Pb(NO3)2 (aq) + 2KI(aq) ⟶ PbI2 (aq) + 2 KNO3 (aq)
Which ion(s) would NOT be spectator ions?
a. Pb2+, NO3-
b. K+, I-
c. NO3-, Pb2+
d. Pb2+, I-
e. All the above ions are in the net ionic equation. ------------ Correct Answer ------------ D
A redox reaction has occurred ______.
a. when a substance reacts with elemental oxygen
b. when an alkali metal reacts with an alkaline earth metal
,c. when one substance transfers protons to another
d. when one substance forms a solid
e. when all of the above occur ------------ Correct Answer ------------ A
What are the coefficients for the following reaction when it is properly balanced?
___NaPO4 +___ Ba(NO3)2 ⟶ ___ NaNO3 + ___Ba3(PO4)2
a. 2,1,1,3
b. 2,3,1,6
c. 2,3,6,1
d. 6,1,3,2
e. none of the above ------------ Correct Answer ------------ C
Which of the following compounds is insoluble?
a. aluminum hydroxide
b. aluminum sulfide
c. aluminum carbonate
d. aluminum sulfate
e. none of the above ------------ Correct Answer ------------ B
The correct number of significant figures in the number 0.002320 is:
a. 7
b. 4
c. 3
d. ambiguous
e. none of the above ---------- Correct Answer ------------ A
What is the definition of a scientific theory?
a. A brief statement that summarizes past observations and predicts future ones.
b. A model that explains the underlying reasons for observations and laws.
c. The equivalent of a scientific opinion which others may disagree with.
d. A method of learning that emphasizes reason as the way to understand the world.
e. None of the above. ---------- Correct Answer ------------ B
Which of the statements below is NOT part of the scientific method?
a. Observation and measurement
b. Formation of a hypothesis
c. Testing of a hypothesis by experimentation
d. Refinement of a hypothesis as needed
e. All of the above steps are part of the scientific method. ---------- Correct Answer ------------ E
, Which statement about the scientific method is TRUE?
a. The scientific method emphasizes reason as the way to understand the world.
b. The scientific method emphasizes observation and reason as the way to understand the world.
c. The scientific method emphasizes observation and experimentation as the way to understand
the world.
d. The scientific method emphasizes scientific laws as the way to understand the world.
e. All of the above statements are false. ---------- Correct Answer ------------ C
Who discovered the atomic theory?
a. John Dalton
b. Antoine Lavoisier
c. Nivaldo Tro
d. John Dalton and Antoine Lavoisier
e. None of the above ---------- Correct Answer ------------ A
Which of the following items does NOT contain chemicals?
a. Drain cleaner
b. Organically grown vegetables
c. Air
d. Insecticides
e. All of the above contain chemicals ---------- Correct Answer ------------ E
Which of the following is an example of an observation?
a. All matter is composed of small, indestructible particles called atoms.
b. Reactions occur due to the transfer of electrons.
c. When a can of soda pop is opened, a fizzing sound is heard.
d. Flammable objects contain phlogiston.
e. None of the above. ---------- Correct Answer ------------ C
In the number 48.93, which digit is estimated?
a. 4
b. 8
c. 9
d. 3
e. none of the above ---------- Correct Answer ------------ D
There are exactly 2.54 cm in 1 in. When using this conversion factor, how many significant
figures are you limited to?
a. 1
b. 3
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