Chapter 2: Chemistry
Clicker Questions
by Kristen Curran, University of Wisconsin-Whitewater
What characteristic of an atom gives it its
chemical properties?
1.
2.
3.
4.
the number of
the number of
the number of
the number of
outer orbital
protons
neutrons
electrons
electrons in its
A sodium ion is positively charged (+1).
How many electrons did it originally have in
its outer orbital as a sodium atom?
1.
2.
3.
4.
5.
1
2
3
7
6
A chloride ion is negatively charged (1).
How many electrons did it originally have in
its outer orbital as a chlorine atom?
1.
2.
3.
4.
5.
1
2
3
7
6
Potassium chloride (KCl) is formed using ionic
bonding. Potassium ions have a net positive charge
(+1). Chloride ions have a net negative charge
(1). How many electrons were in the outer orbital
of the potassium (K) and chloride (Cl) atoms?
1.
2.
3.
4.
K=7;
K=1;
K=7;
K=1;
Cl=7
Cl=6
Cl=6
Cl=7
Classroom Catalyst
• Covalent bonding
• Ionic bonding
• Hydrogen bonding (water)
Calcium chloride salt when put into water (solvent)
is separated into Calcium(++) and Chloride ()
ions. Oxygen, on the other hand, is still present in
water as oxygen (O2). How can this phenomenon
be explained?
1. Calcium and chloride are more strongly bonded together
(covalent) than two oxygen atoms (ionic).
2. Calcium and chloride are more strongly bonded together
(ionic) than two oxygen atoms (covalent).
3. Calcium and chloride are less strongly bonded together
(covalent) than two oxygen atoms (ionic).
4. Calcium and chloride are less strongly bonded together
(ionic) than two oxygen atoms (covalent).
Fish live in water. What property of
water is important for the survival of fish
during the winter.
1.
2.
3.
4.
Cohesion
Heat capacity
Ice floats
Water is a good
solvent.
Why does water display the unique
properties we have just discussed?
1. Because of the covalent bonds between
the oxygen and hydrogen.
2. Because of its ability to hydrogen bond.
3. Because of its ability to make and break
ionic bonds.
4. Because the electrons are shared equally
between the oxygen and hydrogen
atoms.
Which statement is true when
comparing lemon juice (acidic) to
baking soda (basic)?
1. Lemon juice has more OH compared to
baking soda.
2. Lemon juice has more H+ compared to baking
soda.
3. Lemon juice and baking soda both have an
equal amount of OH and H+.
4. Baking soda has more H+ when compared to
lemon juice.
If you were going to build a large macromolecule or
polymer it needs to be strong. What type of chemical
bond do you think would work best for building
macromolecules?
1. Covalent
2. Ionic
3. Hydrogen
When you eat a candy bar you are eating
mostly simple sugars. If you eat a candy bar
while watching a movie, how will your body
utilize those sugars?
1. All of the sugars will be used immediately by
your working muscles.
2. The sugars will likely be stored as glycogen.
3. The sugars will likely be stored as fat.
4. Both 2 and 3 are correct.
Which source of carbohydrates will be
digested the slowest?
1.
2.
3.
4.
Table sugar
Honey
Whole wheat bread
Apple
In making a homemade salad dressing you mix olive
oil, vinegar, and water together. You notice when
you add the vinegar to the water it mixes
immediately. When you add the olive oil it floats on
top of the solution. The vinegar is ____________
and the oil is ____________.
1.
2.
3.
4.
hydrophobic; hydrophilic
acidic; basic
hydrophilic; hydrophobic
basic; acidic
Which answer below is solid at room
temperature?
1.
2.
3.
4.
Saturated fat (like animal fat)
Unsaturated fat (like canola oil)
Trans fat (like margarine)
Both 1 and 3 are correct.
Which answer below will provide all of the
essential amino acids in a meal?
1.
2.
3.
4.
Hamburger
Corn and a legume (complementary)
Apple
Both 1 and 2 are correct.
A protein’s function is most dependent
on…
1.
2.
3.
4.
its shape.
its size.
its color.
Both 2 and 3 are correct.
Given the DNA sequence below, what is the
sequence of the RNA?
CGATTCACTGC
1.
2.
3.
4.
CGATTCACTGC
GCTAAGTGACG
GCUAAGUGACG
GCAGTGAATCG