CHEM 121 EXAM STUDY SHEET COMPLETE QUESTIONS ACCURATE SOLUTIONS

CHEM 121 EXAM STUDY SHEET COMPLETE QUESTIONS ACCURATE SOLUTIONS
CHEM 121 Final EXAM Questions and Answers
Verified Solutions Latest Update 2026/2027

Question:
fundamental particle.

Answer:
take a macroscopic object and divide it repeatedly. Eventually you have a particle, which, if further
divided is no longer the original substance. This smallest piece of the substance is called.



Question:
h2o molecule.

Answer:
the fundamental particle of water is what?



Question:
atom.

Answer:
the basic unit of a chemical element



Question:
molecule.

Answer:
two or more atoms (same or different) chemically bound



Question:
element.

,Answer:
fundamental particle contains only one kind of atom



Question:
compound.

Answer:
two or more different kinds of atoms chemically bound



Question:
the same.

Answer:
in a pure substance, all the fundamental particles are what?



Question:
solution.

Answer:
mixture that is uniform throughout



Question:
density.

Answer:
= mass / volume



Question:
atomic number.

Answer:

, number of protons in the nucleus, defines the element



Question:
mass number.

Answer:
equal to the sum of protons and neutrons



Question:
isotope.

Answer:
what results when you change the number of neutrons in an element?



Question:
atomic mass.

Answer:
weighted average of the masses of the isotopes of an element, gives the mass of one atom of the
element



Question:
alkali metals.

Answer:
group 1 on periodic table



Question:
alkali earth.

Answer:
group 2 on periodic table