Chem121 Ch1 and 2 exam
What is the meaning of the two (2) in ethyl alcohol
C2H5OH?
a. all alcohol molecules contain two carbon atoms
b. there are two carbon atoms per molecule of ethyl
alcohol
c. carbon is diatomic
d. all of these
b. there are two carbon atoms per molecules
Which of the following uses the unit "u" or "amu"?
a. atomic weights of atoms
b. relative masses of atoms
c. molecular weights of molecules
d. more than one response is correct
d. more than one response is correct.
Determine the molecular weight of hydrogen peroxide,
H2O2 in u (or amu).
a.17.01
b. 18.02
c. 34.02
d. 33.01
c. 34.02
The average relative mass of an ozone molecule is
48.0 u. An ozone molecule contains only oxygen
atoms. What does this molecular weight indicate
about the formula of the ozone
a. it is monatomic
b. diatomic
, c. triatomic
d. impossible to determine
c. triatomic
Which of the following particles is the smallest?
a. proton
b. electron
c. neutron
d. nucleus and surrounding electrons
b. electron
Which of the following pairs are about equal in mass?
a. proton and electron
b. electron and neutron
c. proton and neutron
d.impossible to dtermine
c. proton and neutron
Which of the following carries a negative charge?
a. proton
b. neutron
c. electron
d. both proton and neuron
c. electron
Atoms are neutral. how can they have no charge?
a. equal number of protons and neutrons
b. equal numbers of protons and electrons
c. equal numbers of neutrons and electrons
d. any charge has been drained out of the atom
b. equal numbers of protons and elctrons
Isotopes differ from each other in what way?
a. They have different numbers of protons
b. they have different number of neutrons
c. they have different number so electrons outside the
What is the meaning of the two (2) in ethyl alcohol
C2H5OH?
a. all alcohol molecules contain two carbon atoms
b. there are two carbon atoms per molecule of ethyl
alcohol
c. carbon is diatomic
d. all of these
b. there are two carbon atoms per molecules
Which of the following uses the unit "u" or "amu"?
a. atomic weights of atoms
b. relative masses of atoms
c. molecular weights of molecules
d. more than one response is correct
d. more than one response is correct.
Determine the molecular weight of hydrogen peroxide,
H2O2 in u (or amu).
a.17.01
b. 18.02
c. 34.02
d. 33.01
c. 34.02
The average relative mass of an ozone molecule is
48.0 u. An ozone molecule contains only oxygen
atoms. What does this molecular weight indicate
about the formula of the ozone
a. it is monatomic
b. diatomic
, c. triatomic
d. impossible to determine
c. triatomic
Which of the following particles is the smallest?
a. proton
b. electron
c. neutron
d. nucleus and surrounding electrons
b. electron
Which of the following pairs are about equal in mass?
a. proton and electron
b. electron and neutron
c. proton and neutron
d.impossible to dtermine
c. proton and neutron
Which of the following carries a negative charge?
a. proton
b. neutron
c. electron
d. both proton and neuron
c. electron
Atoms are neutral. how can they have no charge?
a. equal number of protons and neutrons
b. equal numbers of protons and electrons
c. equal numbers of neutrons and electrons
d. any charge has been drained out of the atom
b. equal numbers of protons and elctrons
Isotopes differ from each other in what way?
a. They have different numbers of protons
b. they have different number of neutrons
c. they have different number so electrons outside the
