CHEMISTRY 1451 EXAM 1 (CH 1 & 2) |\ |\ |\ |\ |\ |\ |\ |\
questions with correct answers |\ |\ |\
size of atom = - CORRECT ANSWERS ✔✔radius of a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
sphere
atom has - CORRECT ANSWERS ✔✔an equal number of
|\ |\ |\ |\ |\ |\ |\ |\ |\
protons and electrons |\ |\
electrons are - CORRECT ANSWERS ✔✔smaller than
|\ |\ |\ |\ |\ |\ |\
protons and neutrons |\ |\
electrons = - CORRECT ANSWERS ✔✔the size of atom
|\ |\ |\ |\ |\ |\ |\ |\
an atom itself is an - CORRECT ANSWERS ✔✔*electrically
|\ |\ |\ |\ |\ |\ |\ |\ |\
neutral* object (no net charge: number of protons =
|\ |\ |\ |\ |\ |\ |\ |\ |\
number of electrons) |\ |\
Atomic number (Z) - CORRECT ANSWERS ✔✔number of
|\ |\ |\ |\ |\ |\ |\ |\
protons and electrons |\ |\
the big four - CORRECT ANSWERS ✔✔*NOCH
|\ |\ |\ |\ |\ |\
,-NITROGEN
-OXYGEN
-CARBON
-HYDROGEN*
mass number (A) - CORRECT ANSWERS ✔✔number of
|\ |\ |\ |\ |\ |\ |\ |\
protons + number of neutrons|\ |\ |\ |\
(atomic number (z) + number of neutrons (n)
|\ |\ |\ |\ |\ |\ |\
A=Z+N
|\ |\ |\ |\
atomic notation - CORRECT ANSWERS ✔✔
|\ |\ |\ |\ |\
Isotopes - CORRECT ANSWERS ✔✔-atoms who has the
|\ |\ |\ |\ |\ |\ |\ |\
*same number of protons* (atomic number is the same)
|\ |\ |\ |\ |\ |\ |\ |\
-but *different number of neutrons* (mass number is
|\ |\ |\ |\ |\ |\ |\ |\
different)
neutrons = - CORRECT ANSWERS ✔✔mass # (# of
|\ |\ |\ |\ |\ |\ |\ |\ |\
protons and neutrons) - atomic # (protons)
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natural abundance - CORRECT ANSWERS ✔✔percent
|\ |\ |\ |\ |\ |\
distribution of isotopes in a "typical" sample |\ |\ |\ |\ |\ |\
,-how many (%) of isotopes in ex: chlorine
|\ |\ |\ |\ |\ |\ |\
how many 13^carbon are present in 1000 carbon atoms?
|\ |\ |\ |\ |\ |\ |\ |\
carbon13 : (natural abu) 1.10% : (mass) 13.00 amu -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔11 |\ |\
what is the atomic mass? - CORRECT ANSWERS ✔✔an
|\ |\ |\ |\ |\ |\ |\ |\ |\
element's atomic mass is the *average *of the masses of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
naturally occurring *isotopes* *weighted by natural
|\ |\ |\ |\ |\ |\
abundances*
When you have 1000 carbons atoms, then
|\ |\ |\ |\ |\ |\ |\
12^C (mass = 12.00 amu): 989
|\ |\ |\ |\ |\
13^C (mass = 13.00 amu): 11
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What is the average mass of 1000 carbon atoms? -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔12.01 amu |\ |\ |\
Calculate the atomic weight of rubidium, which has two
|\ |\ |\ |\ |\ |\ |\ |\ |\
isotopes with the following properties: 85^Rb (84.91
|\ |\ |\ |\ |\ |\ |\
amu, 72.71% natural occurrence) and 87^Rb (86.91 amu,
|\ |\ |\ |\ |\ |\ |\
, 27.83% natural occurrence). Round your answer to 4
|\ |\ |\ |\ |\ |\ |\ |\ |\
significant figures. - CORRECT ANSWERS ✔✔85.47 amu
|\ |\ |\ |\ |\ |\
H - CORRECT ANSWERS ✔✔hydrogen
|\ |\ |\ |\
He - CORRECT ANSWERS ✔✔Helium
|\ |\ |\ |\
Li - CORRECT ANSWERS ✔✔Lithium
|\ |\ |\ |\
Be - CORRECT ANSWERS ✔✔Beryllium
|\ |\ |\ |\
B - CORRECT ANSWERS ✔✔Boron
|\ |\ |\ |\
C - CORRECT ANSWERS ✔✔Carbon
|\ |\ |\ |\
N - CORRECT ANSWERS ✔✔Nitrogen
|\ |\ |\ |\
O - CORRECT ANSWERS ✔✔Oxygen
|\ |\ |\ |\
F - CORRECT ANSWERS ✔✔Flourine
|\ |\ |\ |\
Ne - CORRECT ANSWERS ✔✔Neon
|\ |\ |\ |\
questions with correct answers |\ |\ |\
size of atom = - CORRECT ANSWERS ✔✔radius of a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
sphere
atom has - CORRECT ANSWERS ✔✔an equal number of
|\ |\ |\ |\ |\ |\ |\ |\ |\
protons and electrons |\ |\
electrons are - CORRECT ANSWERS ✔✔smaller than
|\ |\ |\ |\ |\ |\ |\
protons and neutrons |\ |\
electrons = - CORRECT ANSWERS ✔✔the size of atom
|\ |\ |\ |\ |\ |\ |\ |\
an atom itself is an - CORRECT ANSWERS ✔✔*electrically
|\ |\ |\ |\ |\ |\ |\ |\ |\
neutral* object (no net charge: number of protons =
|\ |\ |\ |\ |\ |\ |\ |\ |\
number of electrons) |\ |\
Atomic number (Z) - CORRECT ANSWERS ✔✔number of
|\ |\ |\ |\ |\ |\ |\ |\
protons and electrons |\ |\
the big four - CORRECT ANSWERS ✔✔*NOCH
|\ |\ |\ |\ |\ |\
,-NITROGEN
-OXYGEN
-CARBON
-HYDROGEN*
mass number (A) - CORRECT ANSWERS ✔✔number of
|\ |\ |\ |\ |\ |\ |\ |\
protons + number of neutrons|\ |\ |\ |\
(atomic number (z) + number of neutrons (n)
|\ |\ |\ |\ |\ |\ |\
A=Z+N
|\ |\ |\ |\
atomic notation - CORRECT ANSWERS ✔✔
|\ |\ |\ |\ |\
Isotopes - CORRECT ANSWERS ✔✔-atoms who has the
|\ |\ |\ |\ |\ |\ |\ |\
*same number of protons* (atomic number is the same)
|\ |\ |\ |\ |\ |\ |\ |\
-but *different number of neutrons* (mass number is
|\ |\ |\ |\ |\ |\ |\ |\
different)
neutrons = - CORRECT ANSWERS ✔✔mass # (# of
|\ |\ |\ |\ |\ |\ |\ |\ |\
protons and neutrons) - atomic # (protons)
|\ |\ |\ |\ |\ |\
natural abundance - CORRECT ANSWERS ✔✔percent
|\ |\ |\ |\ |\ |\
distribution of isotopes in a "typical" sample |\ |\ |\ |\ |\ |\
,-how many (%) of isotopes in ex: chlorine
|\ |\ |\ |\ |\ |\ |\
how many 13^carbon are present in 1000 carbon atoms?
|\ |\ |\ |\ |\ |\ |\ |\
carbon13 : (natural abu) 1.10% : (mass) 13.00 amu -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔11 |\ |\
what is the atomic mass? - CORRECT ANSWERS ✔✔an
|\ |\ |\ |\ |\ |\ |\ |\ |\
element's atomic mass is the *average *of the masses of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
naturally occurring *isotopes* *weighted by natural
|\ |\ |\ |\ |\ |\
abundances*
When you have 1000 carbons atoms, then
|\ |\ |\ |\ |\ |\ |\
12^C (mass = 12.00 amu): 989
|\ |\ |\ |\ |\
13^C (mass = 13.00 amu): 11
|\ |\ |\ |\ |\
What is the average mass of 1000 carbon atoms? -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔12.01 amu |\ |\ |\
Calculate the atomic weight of rubidium, which has two
|\ |\ |\ |\ |\ |\ |\ |\ |\
isotopes with the following properties: 85^Rb (84.91
|\ |\ |\ |\ |\ |\ |\
amu, 72.71% natural occurrence) and 87^Rb (86.91 amu,
|\ |\ |\ |\ |\ |\ |\
, 27.83% natural occurrence). Round your answer to 4
|\ |\ |\ |\ |\ |\ |\ |\ |\
significant figures. - CORRECT ANSWERS ✔✔85.47 amu
|\ |\ |\ |\ |\ |\
H - CORRECT ANSWERS ✔✔hydrogen
|\ |\ |\ |\
He - CORRECT ANSWERS ✔✔Helium
|\ |\ |\ |\
Li - CORRECT ANSWERS ✔✔Lithium
|\ |\ |\ |\
Be - CORRECT ANSWERS ✔✔Beryllium
|\ |\ |\ |\
B - CORRECT ANSWERS ✔✔Boron
|\ |\ |\ |\
C - CORRECT ANSWERS ✔✔Carbon
|\ |\ |\ |\
N - CORRECT ANSWERS ✔✔Nitrogen
|\ |\ |\ |\
O - CORRECT ANSWERS ✔✔Oxygen
|\ |\ |\ |\
F - CORRECT ANSWERS ✔✔Flourine
|\ |\ |\ |\
Ne - CORRECT ANSWERS ✔✔Neon
|\ |\ |\ |\
