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Terms in this set (28)
The concept of an atom as a small particle of matter that cannot be divided was proposed by the ancient Greek phlisopher, Democritus.
Select one:
True
False
True
Dalton's atomic theory improved earlier atomic theory by which two of the
following?
Select one or MORE:
a. theorizing that all atoms of the same element are identical
b. not relating atoms to chemical change
c. using experimental methods to establish a scientific theory
d. teaching that all matter is composed of tiny particles called atoms
a. theorizing that all atoms of the same element are identical and c. using experimental methods to establish a scientific theory
Of
the three subatomic particles that form the atom, the one with the smallest mass is the neutron.
Select one:
True
False
False
Which property is NOT used to distinguish among subatomic particles?
Select one:
a. location within the atom
b. mass
c. color
d. charge
c. color
Which subatomic particles are in
the nucleus of an atom, as discovered by Rutherford?
Select one:
a. electron, proton
b. neutron, electron
c. electrons, protons, neutrons
d. proton, neutron
d. protron, neutron
Isotopes of an element have:
Select one:
a. the same number of protons but different numbers of neutrons
b. the same number of protons but different numbers of electrons
c. the same mass number
d. different
atomic numbers
a. the same number of protons but different numbers of neutrons
How many neutrons are in sulfur-33 (get the atomic number from periodic table)?
Select one:
a. 16 neutrons
b. 32.06 neutrons
c. 17 neutrons
d. 33 neutrons
c. 17 neutrons
The number of which subatomic particles are always equal to an
element's atomic number?
Select one:
a. number of nuclei
b. number of electrons
c. number of neutrons
d. number of protons
d. number of protons
Bohr's planetary model of the atom could not explain:
Select one:
a. the distribution of mass in an atom
b. the distribution of positive and negative charges in an atom
c. any properties of elements
d. the chemical properties of
elements
d. the chemical properties of elements
Bohr's model of the atom proposed that electrons are found:
Select one:
a. orbiting the nucleus in a single fixed circular path
b. in circular orbits at fixed distances from the nucleus
c. embedded in a sphere of positive charge
d. in fixed positions surrounding the nucleus
b. in circular orbits at fixed distances from the nucleus
What is the lowest-numbered energy level in which p orbitals are found?
Select one:
a. 2
b. 4
c. 3
d. 1
a. 2
What would be the maximum number of electrons in a full p sublevel?
Select one:
a. 1
b. 4
c. 0
d. 6
d. 6
The letter ____ is
used to denote a spherical orbital.
Select one:
a. s
b. d
c. f
d. p
a. s
How many sublevels are in the n = 2 principal energy level?
Select one:
a. 6
b. 8
c. 4
d. 2
d. 2
Identify the element that corresponds to the following electron configuration: 1s2 2s2 2p5
Select one:
a. F
b. Cl
c. O
d.
Ne
a. F
Select the correct ground state electron configuration for a neutral atom of nitrogen.
Select one:
a. 1s2 2s2 2p3
b. 1s2 2s1 p3
c. 1s2 2s2 2p1
d. 1s2 2s2 2p5
a. 1s2 2s2 2p3
The aufbau principle states that electrons fill the lowest energy level first.
Select one:
True
False
True
In an electron configuration, what does the superscript stand for?
Select one:
a. sublevel
b. paired electrons
c. distance from the nucleus
d. number of electrons in the orbital
d. number of electrons in the orbital
In an electron configuration, what does the letter stand for?
Select one:
a. quantum level
b. number of
electrons in the orbital
c. energy level of electrons
d. sublevel
d. sublevel
In an electron configuration, what does the "capital" number stand for?
Select one:
a. number of electrons in the orbital
b. paired electrons
c. sublevel
d. energy level of the electrons
d. energy levels of electrons
Filled energy
sublevels are _______ stable than partially filled sublevels.
Select one:
a. more
b. less
a. more
How many electrons are in the highest occupied principle energy level of barium?
Select one:
a. 1
b. 2
c. 3
d. 4
b. 2
Which of the following orbital designations are invalid?
Select one:
a. 3d
b.
2p
c. 3f
d. 4s
c. 3f
What noble gas core would you use to write abbreviated configurations for teach of the following?
Ra
a. [Rn]
b. [Kr]
c [Ar]
a. [Rn]
What noble gas core would you use to write abbreviated configurations for teach of the following?
Ca
a. [Rn]
b. [Kr]
c [Ar]
a. [Ar]
What noble gas core would you use to write abbreviated configurations for teach of the following?
Sn
a. [Rn]
b. [Kr]
c [Ar]
b. [Kr]
Once the electron in a hydrogen atom absorbs a quantum of energy, it:
Select one:
a. has released a photon
b. is now in its excited state
c. is now in its ground
state
d. none of the above
b. is now in its excited state
Which color of visible light, shown below, has the longest wavelength?
Select one:
a. red
b. blue
c. yellow
d. green
a. red
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Verified questionschemistry
Use the periodic table to write the names for the following elements: O, S, Cu, Ag.
Verified answer
chemistry
At $35 ^ { \circ } \mathrm { C } , K = 1.6 \times 10 ^ { - 5 }$ for the reaction $$ 2 \mathrm { NOCl } ( g ) \rightleftharpoons 2 \mathrm { NO } ( g ) + \mathrm { Cl } _ { 2 } ( g ) $$ Calculate the concentrations of all species at equilibrium for each of the following original mixtures. 1.0 mole of NOCl and 1.0 mole of NO in a 1.0-L flask.
Verified answer
chemistry
(a) Estimate the magnitude of the primary kinetic isotope effect on the relative rates of displacement of $^{1}\mathrm{H}$ and $^{3} \mathrm{H}$ in a C-H bond. Will raising the temperature enhance the difference? Take $k_{f}(C-H)=450\ N\ m^{-1}.$ (b) Estimate the magnitude of the primary isotope effect on the relative rates of displacement of $^{16} \mathrm{O}$ and $^{18} \mathrm{O}$ in a C-O bond will raising the temperature enhance the difference? Take $k_{f}(C-O)=1750\ N\ m^{-1}.$
Verified answer
chemistry
Which species is the oxidizing agent in the reaction shown? Fe(s) + PbCl2(aq) → FeCl2(aq) + Pb(s) iron, lead(II) ion, iron(II) ion or lead
Verified answer
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