CHEM 103 Exam | Verified Exam Questions and Answers | Latest
Updated Study Material 2026
Question:
Beginning of SI Units
Answer:
Question:
Units can be length (meters), volume (liters), and mass (grams)
Answer:
Yay Prefixes (Large to small)
Question:
Mega
Answer:
M 1 X 10^6 m = 1 Mm One million meters in one Megameter
Question:
Kilo
Answer:
k 1 x 10^3 m = 1 Km 1000 meters in 1 Kilometer
Question:
centi
Answer:
c 10^2 cm = 1 m 100 centimeters in 1 meter
Question:
milli
Answer:
m 10^3 mm = 1 m 1000 millimeters in 1 meter
,Question:
micro
Answer:
u 10^6 um = 1 m 1 million micrometers in 1 meter
Question:
nano
Answer:
n 10^9 nm = 1 m 1 Billion nanometers in 1 meter
Question:
Angstrom
Answer:
A 10^10 A = 1 m 10 billion A in 1 meter
Question:
pico End of Si Units
Answer:
p 10^12 pm = 1 m 1 trillion picometers in 1 meter
Question:
What is the relationship between melting point and freezing point?
Answer:
They occur at the same temperature for a substance.
Question:
Why are solids and liquids denser than gases?
Answer:
Particles are in direct contact, more per unit of volume (mass).
Question:
What happens to the average speed of atoms as the temperature of a substance increases?
Answer:
The average speed of atoms increases.
,Question:
Which remains solid at higher temperatures: argon or neon?
Answer:
Argon remains solid at higher temperatures than neon.
Question:
Gas phase
Answer:
Molecules far apart and move a lot.
Question:
Liquid phase
Answer:
Molecules in close contact and slide past each other.
Question:
Solid phase
Answer:
Molecules rigidly connected and vibrate.
Question:
Chemical changes
Answer:
Bonds breaking, combustion, new substances form. Produces new kinds of matter
Question:
Physical changes
Answer:
Transitions between s/l/g, no breaking of bonds, density, conductivity, solubility, color, hardness, melting
and boiling points
, Question:
Symbol Atomic mass Atomic number
Answer:
Symbol: C Atomic Mass: 12 (protons + neutrons) Atomic Number: 6 (protons) In neutral atoms, p+=e-
(carbon has 6 electrons when neutral)
Question:
Why is writing a 6 and C redundant?
Answer:
Elements are defined by their atomic numbers. # of protons cannot change without changing the elements
identity. All carbon isotopes will all have 6 protons. So an atom with ^ protons will always be Carbon.
They mean the same thing.
Question:
Rutheford's Experiment/Gold foil experiment
Answer:
Prediction: -most particles pass through -small deflections No real interaction should happen
Observation: -Most particles passed through undeflected -Some particles deflected at large angles -Some
particles reflected back to source
Question:
Rutheford's experiment conclusion?
Answer:
Most of an atom is empty space, with a large, dense, positive mass in the center
Question:
What is an element?
Answer:
Pure chemical substance consisting of one type of atom.
Question:
Which element is most abundant in the earth's crust?
Answer:
Oxygen.
Updated Study Material 2026
Question:
Beginning of SI Units
Answer:
Question:
Units can be length (meters), volume (liters), and mass (grams)
Answer:
Yay Prefixes (Large to small)
Question:
Mega
Answer:
M 1 X 10^6 m = 1 Mm One million meters in one Megameter
Question:
Kilo
Answer:
k 1 x 10^3 m = 1 Km 1000 meters in 1 Kilometer
Question:
centi
Answer:
c 10^2 cm = 1 m 100 centimeters in 1 meter
Question:
milli
Answer:
m 10^3 mm = 1 m 1000 millimeters in 1 meter
,Question:
micro
Answer:
u 10^6 um = 1 m 1 million micrometers in 1 meter
Question:
nano
Answer:
n 10^9 nm = 1 m 1 Billion nanometers in 1 meter
Question:
Angstrom
Answer:
A 10^10 A = 1 m 10 billion A in 1 meter
Question:
pico End of Si Units
Answer:
p 10^12 pm = 1 m 1 trillion picometers in 1 meter
Question:
What is the relationship between melting point and freezing point?
Answer:
They occur at the same temperature for a substance.
Question:
Why are solids and liquids denser than gases?
Answer:
Particles are in direct contact, more per unit of volume (mass).
Question:
What happens to the average speed of atoms as the temperature of a substance increases?
Answer:
The average speed of atoms increases.
,Question:
Which remains solid at higher temperatures: argon or neon?
Answer:
Argon remains solid at higher temperatures than neon.
Question:
Gas phase
Answer:
Molecules far apart and move a lot.
Question:
Liquid phase
Answer:
Molecules in close contact and slide past each other.
Question:
Solid phase
Answer:
Molecules rigidly connected and vibrate.
Question:
Chemical changes
Answer:
Bonds breaking, combustion, new substances form. Produces new kinds of matter
Question:
Physical changes
Answer:
Transitions between s/l/g, no breaking of bonds, density, conductivity, solubility, color, hardness, melting
and boiling points
, Question:
Symbol Atomic mass Atomic number
Answer:
Symbol: C Atomic Mass: 12 (protons + neutrons) Atomic Number: 6 (protons) In neutral atoms, p+=e-
(carbon has 6 electrons when neutral)
Question:
Why is writing a 6 and C redundant?
Answer:
Elements are defined by their atomic numbers. # of protons cannot change without changing the elements
identity. All carbon isotopes will all have 6 protons. So an atom with ^ protons will always be Carbon.
They mean the same thing.
Question:
Rutheford's Experiment/Gold foil experiment
Answer:
Prediction: -most particles pass through -small deflections No real interaction should happen
Observation: -Most particles passed through undeflected -Some particles deflected at large angles -Some
particles reflected back to source
Question:
Rutheford's experiment conclusion?
Answer:
Most of an atom is empty space, with a large, dense, positive mass in the center
Question:
What is an element?
Answer:
Pure chemical substance consisting of one type of atom.
Question:
Which element is most abundant in the earth's crust?
Answer:
Oxygen.
