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WorksheetsBasic Chemistry Post Quiz
Total questions: 20
Worksheet time: 16mins
Th e element that is least likely to be present in a sample of living matter would be:
Oxygen
Nitrogen
Silicon
Hydrogen
Carbon
In a polar covalent bond between two atoms:
Electrons are shared equally, resulting in no partial charges
Electrons are shared unequally, resulting in no partial charges
Electrons are shared unequally, resulting in a partial charge on the more electronegative atom
Electrons are stolen by the atom with a higher electronegativity value, resulting in a full charge on that atom
According to the electronegativity data in the table, a covalent bond between carbon and hydrogen would be classified as:
Polar
Nonpolar
Ionic
Cannot be determined from the information given.
How many hydrogens are implied in this skeletal diagram?
0
4
6
18
What is the chemical formula for this molecule?
C5
C5H5
C5H10
C5H12
C5H20
What is an example of a chiral object?
A matchstick
A pencil
A hand
A piece of paper
In order for a carbon atom to be chiral, it must have ___ diff erent groups bound to it:
0
1
2
3
4
Are the following molecules structural isomers, stereoisomers, or not isomers?
Not isomers, because the molecules have different chemical formulas.
Structural isomers, because the molecules have different chemical formulas.
Structural isomers, because the molecules have the same chemical formula but different 2-dimensional configurations.
Stereoisomers, because the molecules have the same 2-dimensional configuration but different 3-dimensional configuration.
Are the following molecules structural isomers, stereoisomers, or not isomers?
Not isomers, because the molecules have different chemical formulas.
Structural isomers, because the molecules have different chemical formulas.
Structural isomers, because the molecules have the same chemical formula but different 2-dimensional configurations.
Stereoisomers, because the molecules have the same 2-dimensional configuration but different 3-dimensional configuration.
Which of the following statements is false?
Atoms of the various elements differ in their number of subatomic particles.
All atoms of a particular element have the same number of protons in their nuclei.
The neutrons and protons present in the nucleus of an atom are almost identical in mass; each has a mass of about 1 dalton.
Atom is the smallest unit of an element that still retains the properties of the element.
Protons and electrons are electrically charged particles. Protons have one unit of negative charge, and electrons have one unit of positive charge.
What is the approximate atomic mass of an atom with 16 neutrons, 15 protons, and 15 electrons?
15 daltons
16 daltons
30 daltons
31 daltons
46 daltons
The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement concerning nitrogen?
The nitrogen atom has a mass number of approximately 7 daltons and an atomic mass of 14.
The nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7.
The nitrogen atom has a mass number of 14 and an atomic mass of 7 grams
The nitrogen atom has a mass number of 7 grams and an atomic number of 14.
The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.
One difference between carbon-12 and carbon-14 is that carbon-14 has
Two more protons than carbon-12.
Two more electrons than carbon-12.
Two more neutrons than carbon-12.
A and C only B and C only
Electrons exist only at fixed levels of potential energy. However, if an atom absorbs sufficient energy, a possible result is that
An electron may move to an electron shell farther out from the nucleus.
An electron may move to an electron shell closer to the nucleus
The atom may become a radioactive isotope.
The atom would become a positively charged ion, or cation.
The atom would become a negatively charged ion, or anion.
What are the chemical properties of atoms whose valence shells are filled with electrons?
They form ionic bonds in aqueous solutions.
They form covalent bonds in aqueous solutions.
They are stable and chemically unreactive or inert.
They exhibit similar chemical behaviors
C and D only
Fluorine has an atomic number of 9 and a mass number of 19. How many electrons are needed to complete the valence shell of a fluorine atom?
1
3
5
7
9
A covalent chemical bond is one in which
Electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged.
Protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.
Outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.
Outer-shell electrons of one atom are transferred to the inner electron shells of another atom.
The inner-shell electrons of one atom are transferred to the outer shell of another atom.
If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed?
S-H
H-S-H
H-S-H | H H | H-S-H | H
H=S=H
(Na has 11 protons; Cl has 17 protons)
The ionic bond of sodium chloride is formed when
Chlorine gains an electron from sodium.
Sodium and chlorine share an electron pair.
Sodium and chlorine both lose electrons from their outer valence shells.
Sodium gains an electron from chlorine.
Chlorine gains a proton from sodium.
A van der Waals interaction is the weak attraction between
The electrons of one molecule and the electrons of a nearby molecule.
The nucleus of one molecule and the electrons of a nearby molecule.
A polar molecule and a nearby nonpolar molecule.
A polar molecule and a nearby molecule that is also polar.
A nonpolar molecule and a nearby molecule that is also nonpolar.
