CHEM 120 EXAM (2025) ACTUAL EXAM (detailed
& elaborated) comprehensive questions and
verified accurate solution 2025 TEST!!
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Practice questions for this set
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= (mass solute/mass solute + mass solvent) * 100%
Choose an answer
1 significant figures 2 covalent bond
3 True 4 % by mass
Don't know?
Terms in this set (104)
, a digit that is either reliably known or closely
significant figures
estimated
1. All non-zero digits are always significant
2. Zeroes between non-zero digits are always
significant
3. Zeroes to left of first non-zero digit (either before
Significant Figure Rules
or after decimal point) are never significant
4. Zeroes to the right of last non-zero digit
a. after decimal point are always significant
b. which are before decimal point are not significant
relationship between two quantities expressed as a
conversion factor
fraction
conversion of a measurement in one unit into another
dimensional analysis
by the use of conversion factors
T/F: number of protons never changes according to
True
periodic table
number of protons atomic number=_______________________
number of neutrons mass number=_______________________
atoms with same number of protons (same electron)
isotopes
but different number of neutrons
weighted average of the isotopic masses of all stable
atomic mass
isotopes of an element
substance composed of 2+ elements that are
compound
chemically combined
compound in which atoms are held together by
molecular compound
covalent bonds
nonmetal and metal (giving away of electrons by one
ionic bond and receiving by the other); electrostatic interactions
between positive and negative ions
2 nonmetals (sharing of bonds); the sharing of
covalent bond
electrons between two atoms
& elaborated) comprehensive questions and
verified accurate solution 2025 TEST!!
Save
Practice questions for this set
Learn 1 /7 Study with Learn
= (mass solute/mass solute + mass solvent) * 100%
Choose an answer
1 significant figures 2 covalent bond
3 True 4 % by mass
Don't know?
Terms in this set (104)
, a digit that is either reliably known or closely
significant figures
estimated
1. All non-zero digits are always significant
2. Zeroes between non-zero digits are always
significant
3. Zeroes to left of first non-zero digit (either before
Significant Figure Rules
or after decimal point) are never significant
4. Zeroes to the right of last non-zero digit
a. after decimal point are always significant
b. which are before decimal point are not significant
relationship between two quantities expressed as a
conversion factor
fraction
conversion of a measurement in one unit into another
dimensional analysis
by the use of conversion factors
T/F: number of protons never changes according to
True
periodic table
number of protons atomic number=_______________________
number of neutrons mass number=_______________________
atoms with same number of protons (same electron)
isotopes
but different number of neutrons
weighted average of the isotopic masses of all stable
atomic mass
isotopes of an element
substance composed of 2+ elements that are
compound
chemically combined
compound in which atoms are held together by
molecular compound
covalent bonds
nonmetal and metal (giving away of electrons by one
ionic bond and receiving by the other); electrostatic interactions
between positive and negative ions
2 nonmetals (sharing of bonds); the sharing of
covalent bond
electrons between two atoms
