Name: ______________________________________ Periods: _____________
Date: ________
Chapter 2 Review – Chemistry of Life
Part 1 – Matching
_____ 1.) acid
A. the energy needed to start a chemical reaction
_____ 2.) element
B. substances that reduce the activation energy of a chemical reaction
_____ 3.) ionic bond
C. the ability to move or change matter
_____ 4.) covalent bond
D. a pure substance made up of all of the same kind of atoms
_____ 5.) base
E. the classification given to a solution with a pH less than 7
_____ 6.) catalyst
F. the classification given to a solution with a pH greater than 7
_____ 7.) activation energy
G. sharing of electrons
_____ 8.) energy
H. gaining or losing electrons
Part 2 – Multiple Choice
_____ 9.) Which of the following correctly describes an atom?
A. An atom consists of a central core made of positive protons and neutral neutrons. Moving around the core at
high speeds are tiny, negatively charged electrons.
B. An atom consists of a nucleus made of positive electrons and neutral neutrons. Moving around the nucleus at
high speeds are tiny, negatively charged protons.
C. An atom consists of a nucleus made of positively charged neutrons and electrons. Moving around the nucleus
at high speeds are tiny, negatively charged protons.
D. An atom consists of two parts: a positively charged nucleus at the center of the atom and negatively charged
protons, neutrons, and electrons balancing the charge as they move around the nucleus.
_____ 10.) Which of the following describes the structure of a water molecule?
A. Two hydrogen atoms form ionic bonds with one oxygen atom.
B. Two large hydrogen atoms form covalent bonds with a single, smaller oxygen atom.
C. The three atoms of a water molecule, H—O—H, bond in a way that’s forms a straight line. This allows the
electrons to be shared equally over the entire molecule.
D. Two small hydrogen atoms bond to the oxygen atom. They hydrogen atoms bond on one side of the oxygen
at a slight angle.
_____ 11.) Which of the following is not a property of water?
A. The ability of water to store heat.
B. The nonpolarity of water.
C. The cohesion of water molecules.
D. The adhesion of water molecules.
_____ 12.) A polar compound is a compound with a(n)
A. net neutral charge.
B. net positive charge.
C. net negative charge.
D. uneven distribution of charge.
_____13.) How is the polarity of water related to its ability to dissolve substances?
A. The polarity of water allows it to dissolve other polar compounds.
B. The polarity of water allows it to dissolve only nonpolar compounds.
C. The polarity of water means that only ionic compounds can dissolve in water.
D. The polarity of water means that all compounds can dissolve in water, except ionic compounds.
_____14.) In living organisms, enzymes play an important role in chemical reactions by
A. allowing the reaction to proceed with little or no activation energy.
B. serving as a source of activation energy for a reaction.
C. becoming one of the key reactants.
D. becoming one of the key products.
Part 3 – Short Answer
14. Briefly explain the difference between ionic and covalent bonds. What two types of covalent bonds exist? Explain
each.
15. Define both adhesion and cohesion and describe how these properties are applied to water.
16.) Below are pictures of the 5 organic compounds that were studied in Chapter 2. Label each of the pictures on lines
provided. For each compound, fill in the following information in the space provided below: definition, example, 2 facts.
This information can be found in the Ch. 2 Note Guide or in the book.
a.)
b.)
d.)
a.)
b.)
c.)
d.)
e.)
c.)
e.)