CHEM 120 Final Exam Review 2024/25 EDITION ALL CORRECT RATED GRADE A+
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CHEM 120 Fnal Exm Rview
Institución
CHEM 120 Fnal Exm Rview
significant figures
a digit that is either reliably known or closely estimated
Significant Figure Rules
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 or after decimal point) are ...
which are before decimal point are not significant
conversion of a measurement in one unit into anoth
atoms with same number of protons same electron
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CHEM 120 Fnal Exm Rview
CHEM 120 Fnal Exm Rview
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CHEM 120 Final Exam Review 2024/25
EDITION ALL CORRECT RATED GRADE A+
significant figures
a digit that is either reliably known or closely estimated
Significant Figure Rules
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 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
conversion factor
relationship between two quantities expressed as a fraction
dimensional analysis
conversion of a measurement in one unit into another by the use of
conversion factors
True
T/F: number of protons never changes according to periodic table
number of protons
atomic number=_______________________
number of neutrons
mass number=_______________________
isotopes
atoms with same number of protons (same electron) but different
number of neutrons
atomic mass
weighted average of the isotopic masses of all stable isotopes of an
element
compound
substance composed of 2+ elements that are chemically combined
molecular compound
compound in which atoms are held together by covalent bonds
ionic bond
nonmetal and metal (giving away of electrons by one and receiving by
the other); electrostatic interactions between positive and negative
ions
covalent bond
2 nonmetals (sharing of bonds); the sharing of electrons between two
atoms
ion
, atom that has an electrostatic charge
cation
positively charged atom
anion
negatively charged atom
formula unit
simplest whole number ratio of ions in ionic compound
polyatomic ion
groups of covalently-bonded atoms that have an overall charge
physical change
change in a substance that does not change its composition
extensive physical properties
properties that depend on the amount of matter present (ex-mass,
volume)
intensive physical properties
properties that do not depend on the amount of matter present (ex-
color, clarity, physical state, melting/boiling points, density)
chemical change
the transformation of a substance into a different substance
(ex-rusting iron, burning coal, baking soda reacting with vinegar
density
the ratio of a substance's mass to its volume D=m/V
mixture
2 or more substances which are physically combined
heterogeneous mixture
non-uniform mixture containing two or more phases with definite
boundaries between them
homogeneous mixture
uniform mixture which contains only one phase
solution
another word for homogeneous mixture, but usually refers to a liquid
mixture
compound mixtures
The following are characteristics of:
-pure substance
-2+ elements chemically combined
-final compound does NOT have properties of original
-cannot be separated by physical methods
homogeneous mixtures
-NOT pure substance
-2+ substances physically combined
-final mix has the properties of each of the components that make it
up
-can be separated by physical means
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