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Nature of Matter
What are the numbers of protons, neutrons, and electrons in an isotope of titanium with a mass number of 50?
22 p, 22 n, 28 e
28 p, 22 n, 22 e
50 p, 22 n, 50 e
22 p, 28 n, 22 e
22 p, 28 n, 22 e
What are shared in covalent bonds?
When compared to sulfur-32, sulfur-34 has more —
Which compound has a covalent bond?
The picture shows a cube that contains 20 mL of a solution. The solution has a mass of 40 grams. What is
the density in g/mL of this solution?
Which of the following chemical
equations is balanced correctly?
The figure below represents a reaction.
What type of reaction is shown?
Under certain conditions, solid magnesium
(Mg) and solid sulfur (S) can combine and
form magnesium sulfide (MgS). The
Equation for thisreaction is shown below.
Mg(s) +S(s) → MgS(s)
What is the oxidation
number for Mg in MgS in this reaction?
When the equation is correctly balanced, the coefficient of H 2 SO 4 is —
The three main types of nuclear radiation
are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?
gamma, beta, alpha
What is a problem commonly associated with nuclear power facilities?
A. A small quantity of energy is produced.
B. Reaction products contribute to acid rain.
C. It is impossible to control nuclear fission.
D. It is difficult to dispose of wastes.
New York 08
It is difficult to dispose of wastes.
One benefit of nuclear fission reactions is
A. nuclear reactor meltdowns
B. storage of waste materials
C. biological exposure
D. production of energy
New York 08
production of energy
The final elements produced by radioactive decay differ from the original radioactive elements because the nuclei of the final elements are always
A. more stable.
B. increased in mass.
C. half as radioactive.
D. positively charged.
An original sample of the radioisotope
fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21?
New York 09
New York 09
The total number of protons and the total number of electrons in the atom
How many valence electrons are there in the elements in family 16 of the periodic table?
They have six valence electrons
New York 07
The label below contains information 13 about an unknown metal.
UNKNOWN METAL M
Most common salts
M 2 O3
How many valence electrons does the unknown metal have?
What type of particle would have
and what would be the charge if
the particle has 36 electrons,
49 neutrons, and 38 protons?
an ion with a charge of 2
Which of these statements describes
what happens to the molecules of a solid
as the temperature is lowered to absolute
A They begin to take up more space.
B They become farther apart.
C Their kinetic energy gradually increases to a maximum.
D Their motion gradually decreases and eventually stops.
Their motion gradually decreases and
Which of these best describes sublimation?
A. A solid changing to a liquid phase
B. A solid changing to a gaseous phase
C. A gas filling the space in its container
D. A liquid taking the shape of its container
A solid changing to a gaseous phase
Which of the following is not true of a sample of gas as it is heated in a rigid, closed container?
A. The pressure of the molecules increases.
B. The average speed of the molecules increases.
C. The average distance between molecules increases.
D. The number of collisions between molecules increases.
The average distance between molecules increases.
The illustration below shows a hot-air balloon. The pilot can
change the altitude of the hot-air balloon by changing the
temperature of the gas inside the balloon. When the gas is heated, the balloon rises.
Which of the following best explains this phenomenon?
A. Heating the gas reduces its pressure.
B. Heating the gas decreases its density.
C. Heating the gas decreases its molecular motion.
D. Heating the gas reduces the frequency of the gas molecules’ collisions.
Heating the gas decreases its density.
According to Boyle’s law, the relationship between the pressure and volume of a gas at constant temperature is
A. numerically equivalent
B. inversely proportional
C. positively correlated
D. totally unrelated