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WorksheetsBiochemical Concepts Review
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
Which of the following is NOT a part of an atom?
a)
nucleus
b)
electrons
c)
nucleoid
d)
protons
2.
Where are electrons found in an atom?
a)
attached to protons in the nucleus
b)
attached to neutrons in the nucleus
c)
orbiting the atom outside the electron shell
d)
orbiting the nucleus in electron shells
3.
What number of valence electrons creates a stable arrangement for MOST atoms?
a)
5
b)
6
c)
7
d)
8
4.
An equal sharing of electrons results in what kind of bond?
a)
covalent
b)
hydrogen
c)
ionic
d)
metallic
5.
Water molecules attract one another to form what kind of bonds?
a)
covalent
b)
hydrogen
c)
ionic
d)
metallic
6.
What is the pH of pure water?
a)
1.0
b)
4.0
c)
7.0
d)
9.0
7.
What is the most abundant compound in living organisms?
a)
carbon dioxide
b)
water
c)
sodium chloride
d)
sugar
8.
Why are water molecules considered polar?
a)
The oxygen side is slightly positive, and the hydrogen side is slightly negative.
b)
the oxygen and hydrogen sides are slightly positive.
c)
the oxygen and hydrogen sides are slightly negative.
d)
the oxygen side is slightly negative, and the hydrogen side is slightly positive.
9.
Which of the following is true about a substance that has concentrations of hydrogen ions lower than pure water.
a)
It has a neutral pH.
b)
It is an acid.
c)
It is a base.
d)
It is an isotope of carbon.
10.
Which of the following is true about a substance that has concentrations of H+ ions higher than pure water.
a)
It has a neutral pH.
b)
It is an acid.
c)
It is a base.
d)
It is an isotope of carbon.
11.
Which of the following compound is formed by a covalent bond?
a)
NaCl
b)
MgO
c)
KCl
d)
H2O
12.
The diagram shows which type of bonding?
a)
covalent
b)
ionic
c)
metallic
d)
diatomic
13.
The diagram shows a sodium atom and a chlorine atom.
When sodium reacts chemically with chlorine, the outermost electron of sodium will transfer to which numbered area in the diagram?
When sodium reacts chemically with chlorine, the outermost electron of sodium will transfer to which numbered area in the diagram?
a)
1
b)
2
c)
3
d)
4
14.
How does having a high specific heat allow water to support living organisms?
a)
It helps to prevent sudden changes in temperature within an organism.
b)
It is less dense and floats when frozen.
c)
It exhibits capillary action to transport water through narrow tubes in plant stems.
d)
It dissolves ions to be transported to cells.
15.
What makes up a water molecule?
a)
one atom of oxygen and one atom of hydrogen
b)
one atom of sodium and one atom of chlorine
c)
one atom of hydrogen and two atoms of oxygen
d)
two atoms of hydrogen and one atom of oxygen
16.
Which of the following illustrates the adhesive property of water?
a)
Ice floats when it is put into a beverage.
b)
Water condenses on a window
c)
Pond water evaporates once it has absorbed a large amount of energy
d)
Rainwater absorbs airbone pollutants
17.
Which property of water helps it to transport many substances throughout the body?
a)
property of water being transparent
b)
property of being cohesive
c)
property of high specific heat
d)
property of being a universal solvent
18.
Which of the following is possible because of the cohesive property of water?
a)
Water sticks to other water molecules on the surface of a penny
b)
An iceberg forms at the South Pole.
c)
Calcium ions are transported in the blood.
d)
Light reaches the bottom of a shallow lake.
19.
What type of bond is formed when atoms share electrons?
a)
covalent
b)
ionic
c)
hydrogen
d)
polyatomic
20.
Adhesion occurs when water is attracted to other polar substances. Which of the following is an example of adhesion in organisms?
a)
Capillary action of liquid in plant stems
b)
Release of sweat to reduce body heat
c)
Movement of ions to maintain homeostasis
d)
Pumping of blood through the circulatory system
21.
The classic example of covalent bonding is
a)
NaCl
b)
H2O
c)
MgCl
d)
NaOH
22.
The classic example of ionic bonding is
a)
NaCl
b)
H2O
c)
MgBr
d)
NaF
23.
How many atoms are in the following compound?
20 C6H12O6
20 C6H12O6
a)
240
b)
480
c)
360
d)
120
24.
This diagram illustrates what?
a)
compounds of hydrogen
b)
molecules of hydrogen
c)
ions of hydrogen
d)
isotopes of hydrogen
25.
This diagram illustrates what?
a)
compounds of hydrogen
b)
molecules of hydrogen
c)
ions of hydrogen
d)
isotopes of hydrogen
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