Download Chemistry in Biology Unit Test Review Name: Atoms, Elements and

Chemistry in Biology Unit Test Review
Name: ___________________________________
Atoms, Elements and Compounds
1. In the space below draw a diagram of the atom chlorine. Be sure to keep in mind the number of electrons at
each energy level.
2. Label the following on your diagram of chlorine
a. Nucleus
b. Energy Level
c. Valence Electron
3. What two subatomic particles can be found in the nucleus? _________________ and _________________
4. Identify the following for Carbon:
a. Atomic Number_________________
b. Atomic Mass ___________________
c. Number of Protons ______________
d. Number of Neutrons _____________
e. Number of Electrons _____________
f.
Number of Valence Electrons ______
5. Briefly explain how the periodic table of elements is organized.
6. What is an Isotope?
1
7. How are radioactive isotopes used in Biology?
8. Solve: A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at
Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625
grams of this strontium-90 remain?
9. What is a compound?
10. Complete the following table:
Types of Bonds
Covalent
Ionic
Hydrogen
Description
Water
1. Draw a diagram of a water molecule in the space provided:
2. How are water molecules held together?
2
3. Why is water considered to be a polar molecule?
4. What is an example of a nonpolar molecule? _____________________
5. Differentiate between hydrophobic and hydrophilic:
6. Complete the following table:
Description
Example

Homogenous

Homogenous

Heterogenous

Heterogenous
Mixture
Solute
Solvent
Adhesion
Cohesion
7. Draw the pH scale on the line provided below, and label (hint look at pg 165 in your book)
8. How is water an example of van der Waals forces?
3
The Building Blocks of Life
1. What is so unique about Carbon? Make as many points as possible.
2. Complete the following table:
Group
Example
Function
Carbohydrates
Lipids
Proteins
Nucleic Acid
3. What is the difference between a monomer and polymer?
4. What lipids can be found in cell membranes? What is important about their structure?
5. What does dehydration synthesis do? Hydrolysis?
6. Explain the different between primary, secondary and tertiary structure in proteins.
4
Chemical Reactions
1. Explain the difference between a chemical and physical change.
2. Label the following in the equation found below: Reactant(s) and Product(s)
H2 + O2
H 2O
3. Is the chemical equation above balanced? If not balance it.
4. What is activation energy?
5. What is an enzyme? What does it do to the activation energy?
6. What happens to the speed of reactions in the following conditions when enzymes are present:
a. Extremely high temperature:
b. Extremely low temperature:
c. Acidic or basic pH:
5
7. What is occurring in the following diagrams?
8. Differentiate between an exothermic and endothermic reaction:
9. What is so special about the shape of enzymes?
10. Draw a picture of an enzyme interacting with a substrate. Be sure to label enzyme, substrate, enzyme-substrate
complex and product.
11. Why is an enzyme described as a catalyst?
6