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WorksheetsCh 2 Chemistry of Life PRACTICE Test
Total questions: 39
Worksheet time: 40mins
If an atom is made up of 6 protons, 7 neutrons, and 6 electrons, what is the atomic number?
7
6
13
19
Acidic solutions have a pH that is
less than 7
between 0-14
a negative number
more than 7
Is this a neutral atom or an ion of Carbon?
neutral atom
ion
Which of the following states of matter contain(s) particles that are tightly linked together in a definite shape?
solid
liquid
gas
solid and liquid
A boron (B) atom will lose 3 electrons to become
an isotope
a polar molecule
a negative ion
a positive ion
The following is an example of ________________ bonding.
ionic
covalent
hydrogen
none of these
This graph represents the energy changes that occur as a chemical reaction progresses. What is represented by the smaller arrow?
energy needed with a catalyst
energy needed without a catalyst
A solution with a pH of 11 is
acidic
alkaline (basic)
neutral
a buffer
Bases have an excess of _________ ions.
H3O+
OH-
A molecule such as water, that has a partial positive charge on one side and a partial negative charge on the other side is called a
nonpolar molecule
polar molecule
charged molecuule
bipolar molecule
Enzymes
are able to heat up molecules so that they can react.
provide CO2 for chemical reactions.
are biological catalysts.
absorb excess heat so that reactions occur at low temperatures.
Atoms become more stable when they form compounds because
they always lose electrons.
their outer orbitals become filled.
they always gain electrons.
their nucleus loses extra protons.
The Nitrogen atoms in this molecule are held together by a double covalent bond.
TRUE
FALSE
Atoms in the same group or column in the periodic table have the same number of
protons.
neutrons.
energy levels.
valence electrons.
Sharing of electrons between atoms of two or more elements
results in the formation of an ion.
results in the formation of a compound.
results in the formation of noble gases.
results in destabilization of the atoms involved.
What is the atomic mass of this atom?
11
12
23
34
Buffers
are of relatively little importance in living things.
are formed when a large number of hydroxide ions are released in a solution.
are formed when a large number of hydronium ions are released in a solution.
tend to prevent pH from changing too much.
The electrons of an atom
are found in the nucleus along with protons.
orbit the nucleus in various energy levels.
have a positive charge.
are attracted to the positive charge of neutrons.
An atom that has gained or lost electrons is called a(n)
molecule.
isotope.
ion.
element.
In an aqueous salt solution, salt is the
solvent.
acid.
base.
solute.
The bond formed when two atoms share a pair of electrons is called a
hydrogen bond.
nonpolar bond.
covalent bond.
water bond.
Water droplets did not stick to the wax paper because the wax paper is
polar.
nonpolar.
Atoms are composed of
protons with a positive charge.
neutrons with no charge.
electrons with a negative charge.
All of the above.
The maximum number of electrons that the second energy level can hold is ___________.
2
10
8
16
Acids have an excess of ___________ ions.
H3O+
OH-
A water molecule is polar because its hydrogen and oxygen atoms
both lose electrons.
become electrons.
both gain electrons.
do not share the electrons equally.
How many more times acidic is vinegar (pH 3) than coffee (pH 5)?
10 times.
100 times.
1,000 times.
10,000 times.
A neutral solution has an equal number of
hydrogen (H+) and hydronium (H3O+) ions.
hydroxide (OH-) and hydronium (H3O+) ions.
oxygen (O2-) and hydroxide (OH-) ions.
oxygen (O2-) and hydrogen (H+) ions.
An attraction between substances of the same kind, for example, two water molecules, is called
gravity.
adhesion.
polarity.
cohesion.
All matter in the universe is composed of
cells.
molecules.
atoms.
carbon.
A substance that is composed of only one type of atom is called a(n)
nucleus.
cell.
element.
molecule.
A substance that dissolved n another is called a(n)
aqueous solution.
solute.
solvent.
saturated solution.
The following is an example of _________________ bonding.
ionic
covalent
hydrogen
none of the above
The bonds between the water molecules which are represented by dotted lines, are called _______________ bonds and result in _______________.
covalent; adhesion
hydrogen; cohesion
ionic; dissociation
covalent; neutralization
Valence electrons are the only electrons involved in chemical bonding.
True
False
In the following chemical reaction, C6H12O6 is a(n)
reactant.
acid.
product.
base.
This atom of Argon is stable.
True
False
The chemical symbol of Iron is
F.
I.
Ir.
Fe.
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