A water molecule is made up of

two hydrogen atoms and one oxygen atom

Mass number is defined as

the sum of protons and neutrons

evenly distributed mixture of two or more substances

Water is a polar molecule because

there is an uneven dist. of electrons between O and H atoms

Changing the pH of a solution from 7.0 to 4.0

results in a 1000x increase in hydrogen ion concentration

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Biology Ch 2.1 & 2.2 Miller & Levine

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Quiz corresponds to Ch 2.1-2.2 of the Prentice Hall Biology text by Miller & Levine (dragonfly edition)

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Questions 20

Answers

1
Ice floats on water because
water shrinks when it freezes
of prohesion
water expands when it freezes
ice has a higher density than water
2
A water molecule is made up of
two hydrogen atoms and one oxygen atom
one hydrogen atom and one oxygen atom
two hydrogen atoms and two oxygen atoms
one hydrogen atom and two oxygen atoms
3
An atom with 2 protons, 3 neutrons and 2 electrons has a mass number of
2
3
6
5
4
What type of electrons are available to form bonds?
covalent
valence
nucleus
ionic
5
A covalent bond is formed as the result of
transferring electrons
sharing an electron pair
sharing a proton pair
transferring protons
6
Which element is NOT considered essential to life?
carbon
nitrogen
helium
phosphorous
7
What type of ion forms when an atom loses electrons?
negative
neutral
positive
possibly positive or negative
8
Mass number is defined as
the sum of electrons and protons
the sum of protons and neutrons
the sum of neutrons and electrons
the sum of electrons and protons
9
Identify the subatomic particle(s) that are found in the nucleus.
neutrons and electrons
protons and neutrons
protons and electrons
electrons only
10
A solution is a(an)
chemical reaction
breaking of a chemical bond
evenly distributed mixture of two or more substances
combination of two or more solids
11
The study of the chemistry of living things is called
physical chemistry
analytical chemistry
biochemistry
biogeochemistry
12
Water is a polar molecule because
there is an even dist. of electrons between O and H atoms
there is an uneven dist. of electrons between O and H atoms
there is an uneven dist. of electrons between H atoms only
there is an uneven dist. of electrons between O atoms only
13
When salt is dissolved in water, water is the
solvent
solute
reactant
solution
14
An atom of magnesium (atomic number 12) with a mass number of 24 has how many neutrons?
10
13
12
11
15
What term describes a substance formed by two or more elements in definite proportions?
isotope
nucleus
compound
enzyme
16
Isotopes are atoms of the same element with the same number of protons and
a different number of electrons
a different number of molecules
a different number of neutrons
the same number of neutrons
17
The ability of water to stick to itself is called
adhesion
collation
cohesion
prohesion
18
Changing the pH of a solution from 7.0 to 4.0
results in a 100x decrease in the hydrogen ion concentration
results in a 1000x increase in hydrogen ion concentration
results in a 1000x decrease in hydrogen ion concentration
results in a 100x increase in hydrogen ion concentration
19
The space surrounding the nucleus of an atom contains
neutrons
ions
electrons
protons
20
Of the following acidic substances which is the weakest acid?
rainwater (pH 6.2)
tomatoes (pH 4.2)
sulfuric acid (pH 1.2)
hydrochloric acid (pH 1.0)

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