cem 141 exam ?s 2
1 x 10^4 - ANS-an MRI (magnetic resonance imaging) machine operates at a frequency of 30
kilohertz (kHz), what wavelength radiation does this correspond to?
1.204 x 10^24 H atoms - ANS-how many hydrogen atoms are there in one mole of CH2Cl2
1s^2 2s^2 2p^6 3s^1 - ANS-what is the electron configuration Mg+ ?
2 NH3 + 5 O2 ---> 2 NO + 4H2O? - ANS-ammonia reacts with oxygen to produce nitric oxide
and water. Balance the equation using small, whole number coefficients:
____NH3 + ____O2 ---> ____NO + ____H2O
46 core and 7 valence - ANS-how many core and valence electrons does one atom of iodine (I)
have?
5 - ANS-what is the coefficient for oxygen O2
84% - ANS-hydrogen reacts with oxygen to produce water according to the following equation:
2 H2 + O2 ---> 2 H2O.
you start a reaction with 53 grams of H2 and excess O2 and you end up producing 400 grams
of H2O.
Whaat is the percent yield for this reaction?
Cl- is larger because fewer protons are attracting the same number of electrons as in K+ -
ANS-consider K+ and Cl-.
which do you predict is larger and why?
decreases.
because the relative attraction between the protons and the outer electrons increases -
ANS-atomic radius ________ from left to right across the periodic table
E= 2 x 10^-19 J - ANS-the energies of four photons of light are listed below. Which photon has
the longest wavelength?
LOOK
E= 8 X 10^-16 J
E= 2 x 10^-19 J
LOOK
1 x 10^4 - ANS-an MRI (magnetic resonance imaging) machine operates at a frequency of 30
kilohertz (kHz), what wavelength radiation does this correspond to?
1.204 x 10^24 H atoms - ANS-how many hydrogen atoms are there in one mole of CH2Cl2
1s^2 2s^2 2p^6 3s^1 - ANS-what is the electron configuration Mg+ ?
2 NH3 + 5 O2 ---> 2 NO + 4H2O? - ANS-ammonia reacts with oxygen to produce nitric oxide
and water. Balance the equation using small, whole number coefficients:
____NH3 + ____O2 ---> ____NO + ____H2O
46 core and 7 valence - ANS-how many core and valence electrons does one atom of iodine (I)
have?
5 - ANS-what is the coefficient for oxygen O2
84% - ANS-hydrogen reacts with oxygen to produce water according to the following equation:
2 H2 + O2 ---> 2 H2O.
you start a reaction with 53 grams of H2 and excess O2 and you end up producing 400 grams
of H2O.
Whaat is the percent yield for this reaction?
Cl- is larger because fewer protons are attracting the same number of electrons as in K+ -
ANS-consider K+ and Cl-.
which do you predict is larger and why?
decreases.
because the relative attraction between the protons and the outer electrons increases -
ANS-atomic radius ________ from left to right across the periodic table
E= 2 x 10^-19 J - ANS-the energies of four photons of light are listed below. Which photon has
the longest wavelength?
LOOK
E= 8 X 10^-16 J
E= 2 x 10^-19 J
LOOK
