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ACS Chemistry general Exam Questions and Correct Answers
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ACS Chemistry general Exam Questions and Correct Answers
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<<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>ACS Chemistry general Exam Questions and
Correct Answers
atomic number =
~: # of protons
mass number =
~: # of protons + neutrons
the number of protons in a neutral atom will equal the
~: # of electrons
how to find the correct number of neutrons
~: mass number - atomic number
Forms of the same elements that differ in amount of neutrons
~: isotopes
What particle, if lost from the nucleus, would NOT cause a change in the atomic number?
~: a neutron because it has no charge
, <<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>
When alpha particles were shot at a metal foil target, most passed through without
deflections, while others deflected at large angles. What did this suggest to Rutherford?
~: that the atoms of the metal were mostly empty space, while the nucleus consisted of most
of the mass which included highly condensed positive particles (which caused the deflection).
An atom has a valence shell configuration of 1s1. To which group of elements on the periodic
table does it belong?
~: IA
alkali metals
electromagnetic spectrum
~:
The greater the wavelength of a photon..?
~: the lower its frequency
The greater the frequency of a photon...?
~: the shorter its wavelength
Light energy formula
, <<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>
~:
What does C in the light energy formula represent?
~:
Give the ground-state electron configuration of an atom in the second period
~: 1s2 2s1
Electrons configuration rule that states electrons do not pair until they have to. (put one
electrons in each electron domain then pair up)
~: Hund's rule
An experimental phenomena associated with atoms having unpaired electrons - which states
such substances are attracted to magnetic fields
~: Paramagnetism
Which drop in energy level results in the greatest emission of energy?
~: n=2 to n=1
quantum numbers
, <<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>
~:
What do the 4 quantum numbers stand for?
~: n = energy level
l = (n-1)
ml -l to l
mn 1/2 or -1/2 (spin)
List the quantum numbers for the s, p, d, and f orbitals
~: s 1,0,0
p 2, 1, -1-0-1
d 3, 2, -2--1-0-1-2
f 4, 3 -3--2--1-0-1-2-3
Py orbital
~:
Which element is represented by X
~: Chromium
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