Chapter 2: Chemistry

Clicker Questionsby Kristen Curran, University of Wisconsin-Whitewater

What characteristic of an atom gives it its chemical properties?

1. the number of protons2. the number of neutrons3. the number of electrons4. the number of electrons in

its outer orbital

A sodium ion is positively charged (+1). How many electrons did it originally have in its outer orbital as a sodium atom?1. 12. 23. 34. 75. 6

A chloride ion is negatively charged (1). How many electrons did it originally have in its outer orbital as a chlorine atom?

1. 12. 23. 34. 75. 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. K=7; Cl=72. K=1; Cl=63. K=7; Cl=64. K=1; 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. Cohesion2. Heat capacity3. Ice floats4. 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. Table sugar2. Honey3. Whole wheat

bread4. 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. hydrophobic; hydrophilic2. acidic; basic3. hydrophilic; hydrophobic4. basic; acidic

Which answer below is solid at room temperature?

1. Saturated fat (like animal fat) 2. Unsaturated fat (like canola oil)3. Trans fat (like margarine)4. Both 1 and 3 are correct.

Which answer below will provide all of the essential amino acids in a meal?

1. Hamburger2. Corn and a legume (complementary)3. Apple4. Both 1 and 2 are correct.

A protein’s function is most dependent on…

1. its shape.2. its size.3. its color.4. Both 2 and 3 are correct.

Given the DNA sequence below, what is the sequence of the RNA?

CGATTCACTGC

1. CGATTCACTGC

2. GCTAAGTGACG

3. GCUAAGUGACG

4. GCAGTGAATCG