WorksheetsAP Chemistry Unit 01 review
Total questions: 14
Worksheet time: 21mins
A sample of an alcohol is tested and found to contain 52% carbon, 35% oxygen, and 13% hydrogen by mass. Tests indicate that the molecular weight of the molecule is between 30 and 80. What is the molecular formula of the alcohol?
C2H5OH
C3H7OH
C4H9OH
CH3OH
C5H11OH
The element hafnium (Hf) has five stable isotopes. The correct number of nuclear particles in an atom of hafnium-178 is:
106 protons, 72 neutrons
72 protons, 178 neutrons
72 protons, 72 electrons
72 protons, 72 electrons
72 protons, 106 neutrons, 72 electrons
How grams of oxygen are present in a 30.0 gram sample of potassium chlorate, KClO3 (MM = 122.55g/mol)?
7.83 grams
150.45 grams
36.8 grams
3.83 grams
11.8 grams
A particle with 15 protons and 18 electrons would be symbolized as:
P3+
Ar
Ar3-
P3-
Ar3+
Which of the following arrangements represent ions?
1) 12 protons, 12 neutrons, 11 electrons
2) 12 protons, 11 neutrons, 12 electrons
3) 11 protons, 12 neutrons, 12 electrons
4) 11 protons, 12 neutrons, 11 electrons
5) 12 protons, 12 neutrons, 12 electron
1 and 3
1, 3 and 4
1 and 2
2 and 3
all of these are ions
When the equation for the combustion of ethane, C2H6, is correctly balanced, the coefficient on oxygen is:
3
7
1
5
9
By knowing the number of electrons in a neutral atom, you should also be able to determine
the number of protons in the neutral atom
the mass of the neutral atom
the number of neutrons in the neutral atom
the atomic number of the neutral atom
two of these choices
Which of the following arrangements represent different isotopes of the same element?
1) 12 protons, 11 neutrons, 12 electrons
2) 11 protons, 12 neutrons, 11 electrons
3) 10 protons, 12 neutrons, 12 electrons
4) 11 protons, 12 neutrons, 10 electrons
5) 12 protons, 12 neutrons, 12 electrons
None of these qualify
All of these qualify
1 and 5
2, 3, 4 and 5
2 and 4
A particle X contains 10 electrons, seven neutrons and has a net charge of 3-. The particle is:
a neon ion
none of these are correct
an oxide ion
obviously polyatomic
a nitride ion
For which of the following compounds does 0.400 mol have a mass of 12.8 grams?
CCl4
C4H10
CO2
CH3OH
CH4
A substance with the formula AB has the composition by mass of 30% A and 70% B. What is the composition by mass of the compound A2B?
65% A, 35% B
50% A, 50% B
70% A, 30% B
60% A, 40% B
46% A, 54% B
The answer choices below provide the first four ionization energies for four different metals. Identify the answer choice that could produce a binary oxide where the ratio of the metal to oxygen is one to one.
IE1 = 578 kJ/mol; IE2 = 1817 kJ/mol; IE3 = 2745 kJ/mol; IE4 = 11577 kJ/mol
IE1 = 419 kJ/mol; IE2 = 3052 kJ/mol; IE3 = 4420 kJ/mol; IE4 = 5877 kJ/mol
IE1 = 590 kJ/mol; IE2 = 1145 kJ/mol; IE3 = 4912 kJ/mol; IE4 = 6491 kJ/mol
IE1 = 633 kJ/mol; IE2 = 1235 kJ/mol; IE3 = 2388 kJ/mol; IE4 = 7091 kJ/mol
Which of the following answer choices provides a correct prediction and justification for relative differences in the first ionization energies of hydrogen and lithium?
The first IE for lithium is greater than that of hydrogen because lithium has more protons in its nucleus
The first IE for lithium is greater than that of hydrogen because the radius of the 1s orbital in lithium is smaller than the 1s orbital in hydrogen.
The first IE for lithium is less than that of hydrogen because lithium has a smaller atomic radius.
The first IE for lithium is less than that of hydrogen because hydrogen has a smaller atomic radius.
Which of the following statements provides a correct prediction about the PES data for silicon?
Removing an electron from the 1s orbital in a neutral silicon atom would requires less entergy than removing an electron from the 2s orbital in a neutral silicon atom.
Removing an electron from the n=2 shell in a neutral silicon atom would require the same amount of energy.
Removing an electron from the 3s orbital in a neutral silicon atom would require less energy than removing an electron from a 3p orbital in a neutral silicon atom.
Removing an electron from a 2p orbital in a neutral silicon atom would require more energy than removing at electron from a 3p orbital in a neutral silicon atom.
