CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
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Course
CHEM 121
Institution
CHEM 121
CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
Define matter, and list its three forms.
matter is anything that has mass in space. It can be either gas, liquid or solid.
Define mass
A measure of the amount of matter in an object
Define physical property...
CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND
ANSWERS UPDATED .Buy Quality Materials!
Define matter, and list its three forms.
matter is anything that has mass in space. It can be either gas, liquid or solid.
Define mass
A measure of the amount of matter in an object
Define physical property and give an example:
Can be observed without changing to composition
Ex: Freezing, melting, evaporation of water, Ice cream melting
Define chemical property and give an example:
a characteristic of matter that allows it to change to something new
Ex: Paper burning, copper reacting with air and water to form copper oxide, wood
burning
What is an molecule?
The smallest part of a substance that maintains the identity of that substance
What is an atom?
Smallest particle of an element that maintains the identity of that element
Define density
The mass of an object divided by its volume
Describe the 3 states of matter
solid, liquid, gas
Gas: Expands to fill container
Liquid: Takes shape of container forms horizontal surface and has fixed volume
Solid: Has fixed shape and volume
What are isotopes?
Isotopes are atoms that have the same number of protons and electrons but different
number of neutrons
Where are protons, neutrons, and electrons located in an atom?
Protons and neutrons are located inside the nucleus; electrons are located outside the
nucleus
diatomic molecule
contains 2 atoms
Ex: N2
triatomic molecule
contains three atoms
Ex: H2O
polyatomic molecule
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