Chapter 3:
Matter and Energy
Practice Test
1.
You made hot tea by soaking several tea bags in a teapot. What is the result?
a.
a chemical reaction
b.
a solution
c.
a covalent compound
d.
an ionic compound
Hint
2.
Molecules that have opposite-charged regions, such as water molecules, are called ________ molecules.
a.
tropical
b.
solution
c.
mixture
d.
polar
Hint
3.
What is a substance composed of two or more atoms of different elements joined by a chemical bond?
a.
a molecule
b.
an atom
c.
a mixture
d.
a compound
Hint
4.
Which part of an atom has a negative charge?
a.
electron
b.
neutron
c.
nucleus
d.
proton
Hint
5.
What is the minimum amount of energy required to start a chemical reaction?
a.
activiation energy
b.
heat energy
c.
kinetic energy
d.
potential energy
Hint
6.
Which of the following is an example of a chemical change?
a.
snow melting
b.
iron tools rusting
c.
steam rising
d.
a pond freezing
Hint
7.
Large molecules are converted to smaller ones by a process called __________ .
a.
evaporation
b.
condensation
c.
hydrolysis
d.
sublimation
Hint
8.
What are organic molecules that have the same chemical formula but different structural formulas?
a.
isotopes
b.
carbohydrates
c.
proteins
d.
isomers
Hint
9.
Atoms of a single element always have the same number of protons, but the number of _______ in their atoms may vary.
a.
electrons
b.
neutrons
c.
electron clouds
d.
energy levels
Hint
10.
What is all matter made up of?
a.
atoms
b.
space
c.
electrons
d.
energy
Hint
