Periodic Table
How many valance electrons are in an atom of Magnesium?
A. 2 B. 3
C. 4 D. 5
2
A bond where electrons are transferred?
A. Ionic bond
B. electronegativity
C. VSEPR
D. direct relationship
Ionic bond
When Group 2 elements form ions, they_____?
A. lose two protons B. lose two electrons
C. gain two protons D. gain two electrons
lose two electrons.
Define: Precision
A. Refers to measurements being close together
B. Total kinetic energy of moving particles
C. Force between polar molecules
D. Average kinetic energy of moving particles
Refers to measurements being close together
Which of the following is an intensive property?
A. Mass B. Volume
C. Calorie Content D. Melting point
Melting point
Using the periodic table, determine the number of neutrons in Oxygen.
A.1 B.5
C. 3 D.8
8
Which of the following covalent bonds is the most polar?
A. H-F B. H-C
C. H-H D. H-N
H-F
How many significant figures in 0.00300
A. 3 B. 6
C. 2 D. 7
3
Define: Ionic bonds
A. A bond where electrons are transferred
B. Property dependent on amount of the substance
C. 2 or more elements chemically combined
D. Known or estimated value in a measurement
A bond where electrons are transferred
A process that releases heat is an _____?
A. Endothermic process B.Polythermic process
C. Exothermic process D. Ectothermic process
exothermic process
What does the number 84 in the name krypton-84 represent?
A. the atomic number B.the mass number
C The sum of the protons and electrons
D. twice the number of protons
The mass number
Isotopes of an element contain different numbers of:
A. Electrons B. Protons
C. Neutrons D. Nuclides
Neutrons
Convert this number into standard notation: 4.5 x 10^3
A. 45000 B. 0.0045
C. 4500 D. 0.45
4500
Define: Specific heat
A. Energy cannot be created or destroyed. Only converted
B. Amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree
C. Refers to measurements being close together
D. Force between polar molecules
Amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree
Emission of light from an atom occurs when an electron_____?
A. Drops from a higher to a lower energy level.
B. Jumps from a lower to a higher energy level.
C. Moves within its atomic orbital
D. Falls into the nucleus
Drops from a higher to a lower energy level.
Of the elements Pt, V, Li, and Kr, which is a nonmetal?
A. Pt B. V
C. Li D. Kr
Krypton
An atom is electrically neutral because:
A. Neutrons balance the protons and electrons
B. Nuclear forces stabilize the charges
C. The numbers of protons and electrons are equal
D. The numbers of protons and neutrons are equal
Neutrons balance the protons and electrons
Express the product of 2.2 mm and 5.00 mm using the correct number of significant digits.
A. 10mm B. 11m
C. 11.0mm D. 11.00mm
11m
Define: Intermolecular forces
A. As one variable increases the other decreases
B. Forces felt between molecule
C.Total kinetic energy of moving particles
D. Theory that predicts the 3-D shape of molecules
Forces felt between molecule
Which of the following is true about subatomic particles?
A. Electrons are negatively charged and are the heaviest subatomic particle. B. Protons are positively charged and the lightest subatomic particle.
C. Neutrons have no charge and are the lightest subatomic particle
D.The mass of a neutron nearly equals the mass of a proton.
The mass of a neutron nearly equals the mass of a proton.
What element has the electron configuration 1s22s22p63s23p3?
A. Nitrogen B. selenuim
C. Phosphorus D. Silver
Phosphorus
Define: nonpolar bond
A. Known or estimated value in a measurement
B. Average kinetic energy of moving particles
C. A covalent bond where electrons are shared equally between atoms
D. Outer shell electrons
A covalent bond where electrons are shared equally between atoms
Define: a significant figure
A. Closeness to the true value
B. Process of measuring heat and energy transfer
C. Known or estimated value in a measurement
D. Outer shell electrons
Known or estimated value in a measurement
Define: electronegativity
A. Mixture where particles are evenly distributed
B. Known or estimated value in a measurement
C. The ability of an atom to attract electrons when the atom is in a compound
D. Theory that predicts the 3-D shape of molecules
The ability of an atom to attract electrons when the atom is in a compound
According to the Aufbau principle__________.
A. an orbital may be occupied by only two electrons
B. electrons in the same orbital must have opposite spins
C.electrons enter orbitals of highest energy first
D. electrons enter orbitals of lowest energy first
electrons enter orbitals of lowest energy first.