1|Page
WGU D425 INTRO TO CHEMISTRY TEST EXAM
WITH QUESTIONS AND 100% CORRECT
ANSWERS|| LATEST AND COMPLETE VERSION
2025-2026 WITH EXPERT VERIFIED SOLUTIONS||
ASSURED PASS
Electron - ANSWER: A subatomic particle that has a negative charge
significant figures - ANSWER: a prescribed decimal place that
determines the amount of rounding off to be done based on the precision
of the measurement
mass number - ANSWER: the sum of the number of neutrons and
protons in an atomic nucleus
average atomic mass formula - ANSWER: (mass)(%)+(mass)(%)/100 (
% in decimal)
atomic radius - ANSWER: the distance from the center of an atom's
nucleus to its outermost electron
,2|Page
Energy level 2 holds how many electrons? - ANSWER: up to 8
electrons
Energy level 3 holds how many electrons? - ANSWER: up to 18
electrons
amu - ANSWER: atomic mass unit
Protons - ANSWER: positive charge
The atomic number of an element is the total number of which particles
in the nucleus? - ANSWER: protons
Lewis Dot Structure - ANSWER: diagram of a molecule using dots to
represent valence electrons
polyatomic ions - ANSWER: groups of atoms with an overall charge
funtional groups - ANSWER: the components of organic molecules that
are most commonly involved in chemical reactions
, 3|Page
Energy level 1 holds how many electrons? - ANSWER: up to 2
electrons
Alkane - ANSWER: a hydrocarbon containing only single covalent
bonds
Alkyne - ANSWER: carbon-carbon triple bond
Alkene - ANSWER: double bond, carbon to carbon.
precipitation reaction - ANSWER: The formation of a solid from a
solution during a chemical reaction. Precipitates are often formed when
two aqueous solutions are mixed together.
mole to mole ratio - ANSWER: A ratio made from the coefficient in a
chemical equation (or from the subscripts in a chemical formula).
Avogadro's number - ANSWER: 6.02 x 10^23, the number of atoms or
molecules in 1 mol
WGU D425 INTRO TO CHEMISTRY TEST EXAM
WITH QUESTIONS AND 100% CORRECT
ANSWERS|| LATEST AND COMPLETE VERSION
2025-2026 WITH EXPERT VERIFIED SOLUTIONS||
ASSURED PASS
Electron - ANSWER: A subatomic particle that has a negative charge
significant figures - ANSWER: a prescribed decimal place that
determines the amount of rounding off to be done based on the precision
of the measurement
mass number - ANSWER: the sum of the number of neutrons and
protons in an atomic nucleus
average atomic mass formula - ANSWER: (mass)(%)+(mass)(%)/100 (
% in decimal)
atomic radius - ANSWER: the distance from the center of an atom's
nucleus to its outermost electron
,2|Page
Energy level 2 holds how many electrons? - ANSWER: up to 8
electrons
Energy level 3 holds how many electrons? - ANSWER: up to 18
electrons
amu - ANSWER: atomic mass unit
Protons - ANSWER: positive charge
The atomic number of an element is the total number of which particles
in the nucleus? - ANSWER: protons
Lewis Dot Structure - ANSWER: diagram of a molecule using dots to
represent valence electrons
polyatomic ions - ANSWER: groups of atoms with an overall charge
funtional groups - ANSWER: the components of organic molecules that
are most commonly involved in chemical reactions
, 3|Page
Energy level 1 holds how many electrons? - ANSWER: up to 2
electrons
Alkane - ANSWER: a hydrocarbon containing only single covalent
bonds
Alkyne - ANSWER: carbon-carbon triple bond
Alkene - ANSWER: double bond, carbon to carbon.
precipitation reaction - ANSWER: The formation of a solid from a
solution during a chemical reaction. Precipitates are often formed when
two aqueous solutions are mixed together.
mole to mole ratio - ANSWER: A ratio made from the coefficient in a
chemical equation (or from the subscripts in a chemical formula).
Avogadro's number - ANSWER: 6.02 x 10^23, the number of atoms or
molecules in 1 mol
