WorksheetsChemistry Final Review Day 2
Total questions: 20
Worksheet time: 12mins
A researcher uses several procedures to separate a rock sample into different
chemicals. A mass of 50 grams of one chemical is produced. If this chemical
cannot be separated into other chemicals, then it is best described as
a compound
a mixture
a solution
an element
Decreasing the concentration of ammonia will cause the system to shift to
left
right
no effect
Which change would cause the chemical reaction of ammonia to shift to the
left?
adding a catalyst to the system
removing heat from the system
adding nitrogen (N2) to the system
removing hydrogen (H2) from the system
Calcium carbonate (CaCO3) is a solid substance that can be purchased as a
powder or in small solid tablets. Which statement BEST explains why a
manufacturer may decide to use powdered calcium carbonate instead of
calcium carbonate in the solid tablet form?
The powdered calcium carbonate has less surface area, resulting in less of
the calcium carbonate available for the reaction
The powdered calcium carbonate has a greater surface area, resulting in
more of the calcium carbonate available for the reaction
The solid tablets of calcium carbonate have less surface area, resulting in
more of the calcium carbonate available for the reaction
The solid tabletsof calcium carbonate have a greater surface area, resulting
in less of the calcium carbonate available for the reactionde
Which is the MOST LIKELY result of increasing the heat added to the chemical
reaction?
heat + CaCO3(s) ⇔ CaO(s) + CO2(g)
The amount of calcium oxide produced is reduced
Less calcium carbonate is needed to produce calcium oxide
Calcium oxide and carbon dioxide are produced at a faster rate
The amount of heat released into the surroundings will increase
Based on the chemical equation, which process will increase the production of
calcium oxide?
heat + CaCO3(s) ⇔ CaO(s) + CO2(g)
Decreasing the heat added to the reaction
Regularly removing CO2 by opening the vents
Reducing the amount of CO2 that escapes by closing the vents
Reducing the amount of calcium carbonate (CaO3) added to reduce costs
What is the mass of 5.00 moles K2SO4?
870 g
34.8 g
174 g
675 g
An isotope of cobalt is indictated by the symbol, 2760Co , which indicates that it has (a) protons and (b) neutrons.
The natural isotope abundance of copper is shown below.
Isotope Percent Abundance
copper-63 69.2%
copper-65 30.8%
The average atomic mass of copper is
63.1 amu
63.6 amu
64.0 amu
64.4 amu
Uranium emits a type of radiation that does not penetrate human skin, but can
be harmful if it gets inside body cells. This type of emission is
alpha radiation
beta radiation
gamma radiation
neutron radiation
If an atom has five protons and four electrons, the atom is
neutral
radioactivity
positively charged
negatively charged
When an atom gains an electron, the atom will
lose a proton
reduce its mass
become radioactive
become negatively charged
The chemical reaction between iron and hydrochloric acid is represented by the
equation shown.
Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
Which observation of this reaction provides the BEST evidence as to how fast
the chemical reaction is taking place?
the rate at which bubbles form during the reaction
the rate at which a precipitate forms during the reaction
the mass of the contents in the test tube before the reaction takes place
the temperature of the contents in the test tube after the reaction takes place
Which observation indicates that a chemical reaction occurred during the
investigation?
A clear liquid turns cloudy after mixing with a powder.
A solid forms from combining two liquids.
No color change after mixing two clear liquids.
No change in temperature after combining the reactants.
Which THREE observations would indicate that a chemical reaction occurred
during a chemical investigation
bubbles beginning to form in the products
a solid forming from combining two liquids
no color change after mixing two liquids
a clear liquid turns cloudy after adding a powder
a change in temperature after combining the chemicals
Radioactive isotopes that enter the body emit high energy particles called
gamma radiation. Nuclear imaging technology detects these particles and
produces images of them.
What would doctors be MOST concerned about when using nuclear imaging?
the detection of possible concerns inside of bone tissues
the ability to detect the presence and location of tumors
the level of accuracy of the images taken during the procedure
the release of gamma radiation from the body after imaging
What are TWO advantages of using radioactive isotopes in medicine?
emitting high-energy particles
detecting medical concerns in bone
accuracy in detecting various medical conditions
injecting radioactive isotopes directly into the body
expenses associated with operating the equipment
A student claims that nuclear power is the best energy source. Which
statements BEST support her claim? Select ALL that apply.
Nuclear power plants create more jobs
The initial cost of a nuclear power plant is high
Nuclear fuel can be used and reused for decades
Nuclear power plants produce less carbon emissions
A small amount of nuclear fuel can create a large amount of energy
A carbon tax is a fee imposed on companies that burn carbon-based fuels such
as coal, oil, and natural gas. Governments can impose carbon taxes to lessen
the release of carbon dioxide into the atmosphere. Which statement BEST
describes how the introduction of a carbon tax would affect the power industry?
A carbon tax would decrease the cost of purchasing and using oil as fuel
A carbon tax would decrease the amount of nuclear waste needed to be
stored
A carbon tax would increase the lifespan of plants that release carbon emissions such as coal and natural gas
A carbon tax would increase the use of energy sources that have little carbon emissions, such as nuclear energy
A student wants to create a neutrally-charged carbon atom with an atomic
mass of 13 amu. How many subatomic particles should he include in his
model?
6 protons, 6 neutrons, and 6 electrons
7 protons, 6 neutrons, and 7 electrons
6 protons, 7 neutrons, and 6 electrons
7 protons, 7 neutrons, and 7 electrons
