Worksheetsbiology quiz chapter 2
Total questions: 52
Worksheet time: 26mins
These are the smallest functional units of matter that form all chemical substances and that
cannot be further broken down by ordinary chemical or physical means.
neutrons
electrons
atoms
molecules
The atomic number of an atom is
the number of protons in the atom.
the number of neutrons in the atom.
the number of protons and electrons in the atom.
the number of protons and neutrons in the atom.
Which of the following represents the smallest functional unit of living organisms?
atoms
molecules
water
proteins
Oxygen has an atomic mass of 16 and an atomic number of 8.
Oxygen has 16 neutrons.
Oxygen has 8 electrons.
Oxygen can form two bonds with other atoms.
Oxygen has 16 neutrons and 8 electrons.
Oxygen has 8 electrons and can form two bonds with other atoms.
The nucleus of an atom is composed of
protons
neutrons
electrons
protons and neutrons
protons and electrons
Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was
important to the development of
detection methods for protons.
alpha particle emitters.
gold as an element.
the modern model for atomic structure.
the concept that atoms have a homogenous distribution of protons throughout the atom.
If a scientist were to shoot protons through an atom, for instance like Rutherford did with
gold foil, he or she would likely find that
most of the protons passed straight through the atom.
few of the protons passed straight through the atom.
most of the protons deflected or bounced back from the atom.
most of the protons would be absorbed by the atom.
The first, inner-most energy shell of an atom
can have a maximum of 8 electrons.
can have a maximum of 2 electrons.
is called the 1s orbital and can have a maximum of 8 electrons.
is called the 2p orbital and can have a maximum of 2 electrons.
If carbon has an atomic mass of 12 and an atomic number of 6 then it has
6 electrons
12 electrons
18 electrons
as many as 6 but no more than 12
Tritiated hydrogen (3H) differs from hydrogen (1H) in that
3H has 2 more protons than 1H.
3H has 2 more electrons than 1H.
3H has 2 more neutrons than 1H.
3H has the same number of neutrons as 1H.
Isotopes are different forms of the same element that
differ in their number of neutrons.
have the same numbers of protons.
are often used in medicine to track biological processes.
can be found in nature.
all options are correct
Which of the following represents an abundant element found in living organisms?
calcium
iron
iodine
hydrogen
Nitrogen has 7 electrons and can form a maximum of ________ bonds with other
elements.
1
2
3
4
Molecules
are derived from the chemical bonding of two or more atoms.
differ in their physical properties from the atoms from which they were derived.
are important to biological processes.
can form from the covalent bonding of two or more atoms.
all options are correct
Which of the following is NOT a molecule?
H2
H2O
CH4
O2
H
Which of the following represents an ion?
Ca2+
He
H2
CO2
KCL
Carbon has 4 electrons and hydrogen has 1 electron in their outer most electron shells.
How many bonds can form between a carbon atom and hydrogen atoms?
0
1
2
3
4
This is formed when an atom loses an electron to another atom.
polar covalent bond
cations and anions that can form ionic bonds
covalent bond
hydrogen bond
nonpolar covalent bond
Which of the following chemical bonds is the strongest?
hydrogen
van der waal forces
hydrophobic interactions
ionic
covalent
What type of bonding is likely to occur between two water molecules or strands of DNA?
covalent
ionic
hydrogen
both hydrogen and covalent
both hydrogen and ionic
Carbon and hydrogen have similar electronegativities and combine together to form
hydrocarbon molecules. What type of bonds form between these atoms?
hydrogen
ionic
polar covalent
nonpolar covalent
What type of bonds form from the unequal sharing of electrons?
hydrogen
ionic
polar covalent
nonpolar covalent
In water, MgCl2 dissociates into Mg2+ and Cl-
. Based on this information what type of
bond is involved in the formation of MgCl2?
hydrogen
ionic
polar covalent
non polar covalent
Which of the following is TRUE of a chemical reaction?
It requires no energy.
It rarely occurs with a catalyst present.
It changes a substance from one form to another.
It is limited to only a few types of organisms.
When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is
formed via a(n)
single covalent bond.
double covalent bond.
triple covalent bond.
ionic bond.
Which of the following is LEAST hydrophilic?
Na+
HCO3-
oil
amphipathic molecules
Amphipathic molecules
possess only hydrophilic properties.
possess only hydrophobic properties.
possess both hydrophilic and hydrophobic properties
possess neither hydrophilic nor hydrophobic properties.
For water to vaporize
.energy must be supplied.
energy must be released
hydrogen bonds are broken.
both energy must be supplied and hydrogen bonds broken.
both energy must be released and hydrogen bonds broken.
The molarity of a solution is
a measure of solute concentration.
the weight of a solid substance.
often expressed as grams per unit volume.
reflects a measure of the amount of oil dissolved in a water.
Based on the colligative properties of water, what would happen if one were to add a
solute to water?
The freezing point of water would decrease.
The freezing point of water would increase.
The boiling point of water would increase.
Both the freezing point of water would decrease and the boiling point of water would
increase.
Which of the following is not true of water?
it is polar
It has a high heat of vaporization.
It has a high heat of vaporization.
Its evaporation helps regulate body temperature.
It is a relatively poor solvent.
If orange juice has a pH of 4 then
the H+ concentration is 4.
it is an acidic solution.
it is an alkaline solution.
it is an acidic solution with a H+ concentration of 4.
ph buffer
minimize fluctuations in the pH of solutions.
are usually weak acids and bases.
are common in biological fluids.
limit major shifts in the amount of H+ and OH-
in solution.
all is correct
If one were to add a strong acid like HCl to an aqueous solution, which would result?
H+ would be released into solution.
The pH would increase.
The pH would decrease.
Both H+ would be released into solution and the pH would increase.
Both H+ would be released into solution and the pH would decrease.
Which is true about a pH buffer?
It increases the amount of H+ in an acidic solution.
It reduces the amount of H+ in an acidic solution.
It reduces the amount of H+ in an alkaline solution.
It increases the amount of OH-
ions in an alkaline solution.
Considering solutions with the following pH, which is alkaline?
8
7
6
5
all are alkaline
Which of the following is TRUE when comparing solutions with a pH of 6 and a pH of
8?
The solution with a pH of 8 has a 100 times higher concentration of hydrogen ions than a
solution with a pH of 6.
The solution with a pH of 8 has a 2 times higher concentration of hydrogen ions than a
solution with a pH of 6.
The solution with a pH of 8 has a 100 times lower concentration of hydrogen ions than a
solution with a pH of 6.
The solution with a pH of 8 has a 2 times lower concentration of hydrogen ions than a
solution with a pH of 6.
One gram of hydrogen, which has an atomic mass of 1, would have fewer atoms than 1
gram of carbon that has an atomic mass of 12.
true
false
Isotopes are different forms of the same element.
true
false
Sulfur 35 (35S) is an isotope of 32S. These elements differ in their number of neutrons.
true
false
Helium is an inert gas that rarely reacts with other elements because it has the maximum
number of valence electrons in its outer shell.
true
false
If lithium has an atomic number of 3 then it will have 1 valence electron.
true
false
The electronegativity of an atom is a measure of its ability to attract electrons to its outer
shell from another atom.
true
false
If lithium has an atomic number of 3 then it will have 1 valence electron.
true
false
ana hemar
The electronegativity of an atom is a measure of its ability to attract electrons to its outer
shell from another atom.
true
false
Table salt forms from sodium and chloride via hydrogen bonding.
true
false
Molecules are generally rigid structures and rarely change shape.
true
false
presence of salt helps prevent oceans from freezing.
true
false
A dehydration reaction that builds larger molecules from smaller units requires the
addition of a water molecule.
trtue
false
The hydroxyl (OH-
) concentration of a solution with a pH of 8 would be 10-6 molar.
true
false
Most enzymes or bioactive molecules work effectively within a broad range of pH.
true
false
Buffers minimize fluctuations in the pH of a solution.
true
false
