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WorksheetsFinal Part 2
Total questions: 50
Worksheet time: 25mins
Which reaction tends to run to completion?
Which of the following is the symbol for an alpha particle?
How many half-lives are required for three-fourths of the nuclei of one isotope in a sample to decay?
2
3
What is the net ionic equation for the precipitation reaction between BaCl2 and Na2SO4?
Ba2+(aq) + SO42-(aq) → BaSO4(s)
Na+(aq) + Cl-(aq) → NaCl(s)
Ba2+(aq) + SO42-(aq) + Na+(aq) + Cl-(aq) → BaSO4(s) + NaCl(s)
BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + NaCl(s)
In the chemical equation wA + xB → yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine
the mass of any of the reactants or products
the mass of B only
the total mass of C and D only
the total mass of A and B only
Which of the following generally have the lowest penetrating power?
beta particles
alpha particles
gamma rays
All have the same penetrating ability.
The energy released in a nuclear reaction comes from
bonds
positrons
the binding energy of the nucleus
electrons
When a binary compound decomposes, what is produced?
an acid
an oxide
two elements
a tertiary compound
Which of the following best describes temperature?
energy as heat absorbed or released in a chemical or physical change
energy in the form of heat
energy of changew
a measure of the average kinetic energy of the particles in a sample of matter
The word equation solid carbon + oxygen gas → carbon dioxide gas + energy, represents a chemical reaction because
CO2 has chemical properties that differ from those of C and O.
the reaction releases energy.
CO2 is a gas and carbon is a crystal.
the reaction absorbs energy.
Each of the four types of reaction stoichiometry problems requires using a
Lewis structure
mole ratio
chart of electron configurations
table of bond energies
At equilibrium,
the forward reaction rate is lower than the reverse reaction rate.
the forward reaction rate is equal to the reverse reaction rate.
no reactions take place.
the forward reaction rate is higher than the reverse reaction rate.
Adding a charged particle common to two solutes decreases solute concentration. This observation demonstrates
hydrolysis
Le Châtelier's principle
the common-ion effect
buffering
Mass defect is the difference between the mass of
an atom and the sum of the masses of its constituent parts.
a nucleus and its atom.
an atom and the sum of the masses of its nucleons.
a neutron and a proton.
The reaction represented by the equation 2HgO(s) → 2Hg(s) + O2(g) is a(n)
synthesis reaction
combustion reaction
decomposition reaction
single-displacement reaction
The minimum energy required for an effective collision is called
kinetic energy
free energy
enthalpy
activation energy
If the concentration of reactants is higher,
the reaction rate is not affected.
the reaction rate is generally lower.
the rate-determining step is eliminated.
the reaction rate is generally higher.
Which of the following pairs of solutions produces a precipitate when combined?
Cu(NO3)2 and K2CO3
Cu(NO3)2 and NaCl
Fe(NO3)3 and MgCl2
CaCl2 and NaNO3
How many moles of HCl are present in 0.55 L of a 0.31 M HCl solution? (molar mass of HCL = 36.46 g/mol)
66 mol
21 mol
0.17 mol
0.56 mol
On a calorimeter, the energy content of a substance is calculated from measurement of the temperature change in a known mass of
air
steel
water
iron
What units are used to measure specific heat?
J/(g⋅oC)
cal/(g⋅oC)
J/(g⋅K)
All of these
Balance the equation in the image.
Reactions end to run to completion if a product
is precipitated out as a solid.
is ionic.
is a liquid.
has a high melting point.
If a 100 g sample of an isotope with a half-life of 10 years decays for 20 years, the remaining mass will be
0 g.
25 g.
10 g.
50 g.
Balance the equation in the image.
The energy transferred between samples of matter because of a difference in their temperatures is called
chemical kinetics
heat
temperature
thermochemistry
Which observation does not indicate that a chemical reaction has occurred?
evolution of heat and light
change in total mass of substances
production of a gas
formation of a precipitate
Which equation is not balanced?
H2 + H2 + O2 → H2O + H2O
4H2 + 2O2 → 4H2O
2H2 + O2 → 2H2O
2H2 + O2 + H2O
Which process is used to speed up chemical reactions?
catalysis
inhibiton
activation
calorimetry
If the temperature and surface area of a liquid remain constant,
no further evaporation occurs.
the liquid is not in equilibrium with its vapor.
the rate of condensation is greater than the rate of evaporation.
the rate of evaporation remains constant.
Which of the following radioactive decay processes does not reduce the atomic number of a nuclide?
electron capture
beta decay
alpha decay
positron decay
Reactions tend to run to completion if
a product in the same phase as the reactants forms.
one product is highly soluble.
a gaseous product forms and escapes.
one product is highly ionized.
When the equation Fe3O4 + Al → Al2O3 + Fe is correctly balance, what is the coefficient of Fe?
3
9
6
4
If a collision between molecules is very gentle, the molecules are
more likely to rebound without reacting.
more likely to react.
less likely to be favorably oriented.
more likely to be favorably oriented.
According to the kinetic-molecular theory, which substances are made of particles?
gases only
liquids only
fluids only
all matter
Which coefficients correctly balance the formula equation
NH4NO2(s) → N2(g) + H2O(l)
2, 2, 2
1, 1, 2
1, 2, 2
2, 1, 1
The mass defect of a nuclide represents its
mass number
energy of chemical reaction
binding energy
atomic mass
What is the molarity of a solution that contains 143 g NaCl in 3.55 L solution? (molar mass of NaCl = 58.44 g/mol)
40.3 M
16.5 M
0.689 M
1.45 M
The reaction represented by the equation 2Mg(s) + O2(g) → 2MgO(s) is a
decomposition reaction
single-displacement reaction
double-displacement reaction
synthesis reaction
The density of a substance undergoes the greatest change when the substance changes from a
solid to liquid
liquid to gas
liquid to a solid
a molecular solid to ionic solid
The molar enthalpy of fusion for water is 6.008 kJ/mol. What quantity of energy is released when 275 g of liquid water freezes? (Molar mass of water is 18.02 g/mol.)
91.7 kJ
825 kJ
15.3 kJ
2.54 kJ
In a nuclear reactor, control rods
absorb some free neutrons
slow neutrons
cool the reactor
protect against radioacitivity
When the energy released by forming solvent-solute attractions is greater than the energy absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving process
is endotherminc.
has a negative enthalpy of solution.
does not occur.
has a positive enthalpy of solution.
Which of the following is the correct relationship between mass and energy?
E = mc2
E2 = mc
E = m2c
E = mc
Which is not an example of a colloid?
sugar water
paint
smoke
butter
Balance the equation in the image. (choose the alpha particle! This problem was written incorrectly so have a freebie!)
Which of the following travels fastest?
gamma rays
alpha particles
beta particles
All travel at the same speed.
Which substance has the lowest density?
H2O(g)
H2O(l)
Hg(l)
Hg(g)
Elements with the greatest nuclear binding energies per nucleon are the
smallest in size
most stable
least stable
largest in size
Which of the following would not be studies in the branch of chemistry called stoichiometry?
the mole ratio of aluminum and chlorine in aluminum chloride
the amount of energy required to break the ionic bonds in calcium fluoride
the mass of carbon produced when a known mass of sucrose decomposes
the number of moles of hydrogen that reacts completely with a known quantity of oxygen
