CHEM 134 MIDTERM 1 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
Question: What is the definition of mass?
Answer: ✔✔ A fundamental measurement that quantifies the total quantity of
matter contained within a physical object.
Question: What constitutes matter?
Answer: ✔✔ Any physical substance in the universe that possesses mass and
occupies a measurable volume of space.
Question: What defines a pure substance?
Answer: ✔✔ A form of matter that maintains a uniform and unchanging chemical
composition throughout, which cannot be separated or reduced into simpler
components using physical methods.
Question: What occurs during a physical process?
Answer: ✔✔ A transformation—such as a phase change from liquid to gas—that
alters the structural form or state of a material without changing its fundamental
chemical identity or composition.
Question: What is the definition of a chemical element?
Answer: ✔✔ A primary, pure substance composed of only one type of atom that
cannot be broken down into any simpler chemical structures.
What is a compond?
, pure substances combined of 2 or more elements in fixed proportions and broken
down by chemical rxns.
What is a mixture?
a combination of pure substances in variable proportions in which individual
substances retain chemical identities and can be separated from one another in
phyiscal processes
What is an atom?
An atom is the smallest particle of an element that retains the elements properties
What is a molecule?
a collection of chemically bonded atoms: chemical bond holds them together
What is the law of constant compostion?
all samples of a compound contain the same elements combined in same
proportions
ex) always 2 molecules of H for 1 of O
What is an ion?
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
Question: What is the definition of mass?
Answer: ✔✔ A fundamental measurement that quantifies the total quantity of
matter contained within a physical object.
Question: What constitutes matter?
Answer: ✔✔ Any physical substance in the universe that possesses mass and
occupies a measurable volume of space.
Question: What defines a pure substance?
Answer: ✔✔ A form of matter that maintains a uniform and unchanging chemical
composition throughout, which cannot be separated or reduced into simpler
components using physical methods.
Question: What occurs during a physical process?
Answer: ✔✔ A transformation—such as a phase change from liquid to gas—that
alters the structural form or state of a material without changing its fundamental
chemical identity or composition.
Question: What is the definition of a chemical element?
Answer: ✔✔ A primary, pure substance composed of only one type of atom that
cannot be broken down into any simpler chemical structures.
What is a compond?
, pure substances combined of 2 or more elements in fixed proportions and broken
down by chemical rxns.
What is a mixture?
a combination of pure substances in variable proportions in which individual
substances retain chemical identities and can be separated from one another in
phyiscal processes
What is an atom?
An atom is the smallest particle of an element that retains the elements properties
What is a molecule?
a collection of chemically bonded atoms: chemical bond holds them together
What is the law of constant compostion?
all samples of a compound contain the same elements combined in same
proportions
ex) always 2 molecules of H for 1 of O
What is an ion?
