Chapter 3:
Matter and Energy
Practice Test
1.
In which type of organic molecules are the number of hydrogen atoms per molecule much greater than the number of oxygen atoms?
a.
lipids
b.
amino acid
c.
proteins
d.
carbohydrates
Hint
2.
Atoms of a single element always have the same number of protons, but the number of _______ in their atoms may vary.
a.
neutrons
b.
electron clouds
c.
electrons
d.
energy levels
Hint
3.
You made hot tea by soaking several tea bags in a teapot. What is the result?
a.
an ionic compound
b.
a chemical reaction
c.
a covalent compound
d.
a solution
Hint
4.
What is all matter made up of?
a.
atoms
b.
electrons
c.
space
d.
energy
Hint
5.
Which part of an atom has a positive charge?
a.
energy level
b.
electron
c.
proton
d.
neutron
Hint
6.
All organic compounds contain the element ______ .
a.
oxygen
b.
nitrogen
c.
hydrogen
d.
carbon
Hint
7.
What are organic molecules that have the same chemical formula but different structural formulas?
a.
carbohydrates
b.
proteins
c.
isomers
d.
isotopes
Hint
8.
A solution in which there are more hydroxide ions than hydrogen ions is a(n) ________ .
a.
lipid
b.
compound
c.
base
d.
acid
Hint
9.
Which part of an atom has a negative charge?
a.
proton
b.
electron
c.
nucleus
d.
neutron
Hint
10.
What is the minimum amount of energy required to start a chemical reaction?
a.
potential energy
b.
activiation energy
c.
heat energy
d.
kinetic energy
Hint
