WGU D425 INTRO TO CHEMISTRY
OBJECTIVE ASSESSMENT ACTUAL EXAM
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS||NEWEST VERSION
1. Protons - ANSWER positive charge
2. The atomic number of an element is the total number of which particles in
the nucleus? - ANSWER protons
3. Electron - ANSWER A subatomic particle that has a negative charge
4. significant figures - ANSWER a prescribed decimal place that determines
the amount of rounding off to be done based on the precision of the
measurement
5. mass number - ANSWER the sum of the number of neutrons and protons
in an atomic nucleus
,6. amu - ANSWER atomic mass unit
7. average atomic mass formula - ANSWER (mass)(%)+(mass)(%)/100 ( %
in decimal)
8. mole to mole ratio - ANSWER A ratio made from the coefficient in a
chemical equation (or from the subscripts in a chemical formula).
9. homogeneous mixture - ANSWER A mixture in which substances are
evenly distributed throughout the mixture
10.heterogeneous mixture - ANSWER A mixture in which different materials
can be distinguished easily
11.1 mole expressed in scientific notation - ANSWER 6.022X10^23
12.CN- - ANSWER Cyanide
13.HCl - ANSWER hydrochloric acid
14.C2H302- - ANSWER Acetate
15.NH4+ - ANSWER Ammonium
,16.CO32- - ANSWER Carbonate
17.ClO3- - ANSWER Chlorate
18.ClO2- - ANSWER Chlorite
19.PO43- - ANSWER Phosphate
20.OH- - ANSWER Hydroxide
21.NO3- - ANSWER Nitrate
22.SO42- - ANSWER Sulfate
23.The coefficients in a chemical equation represent the - ANSWER gives
the number of molecules, atoms or moles of that type of element
24.exothermic reaction - ANSWER A reaction that releases energy in the
form of heat
25.Endothermic - ANSWER (of a chemical reaction or compound) occurring
or formed with absorption of heat
, 26.linear fit - ANSWER a line intended to model the relationship between
variables.
27.Acid - ANSWER any compound that forms H+ ions in solution
28.limiting reactant (reagent) - ANSWER the reactant that is completely
consumed when a reaction is run to completion
29.percent yield formula - ANSWER actual yield/theoretical yield x 100
30.How many valence electrons does carbon have? - ANSWER Carbon has
4 valence electrons
31.How many valance electrons do halogens have? - ANSWER 7 valance
electrons
32.reaction rate - ANSWER the rate at which reactants change into products
over time
33.How does increasing temperature affect the rate of reaction? -
ANSWER increasing temperature caused the kinetic energy to increase.
Thus, Molecules are moving faster and colliding more frequently. This
causes the rate of reaction to increase.
34.Solid - ANSWER Definite shape and volume
OBJECTIVE ASSESSMENT ACTUAL EXAM
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS||NEWEST VERSION
1. Protons - ANSWER positive charge
2. The atomic number of an element is the total number of which particles in
the nucleus? - ANSWER protons
3. Electron - ANSWER A subatomic particle that has a negative charge
4. significant figures - ANSWER a prescribed decimal place that determines
the amount of rounding off to be done based on the precision of the
measurement
5. mass number - ANSWER the sum of the number of neutrons and protons
in an atomic nucleus
,6. amu - ANSWER atomic mass unit
7. average atomic mass formula - ANSWER (mass)(%)+(mass)(%)/100 ( %
in decimal)
8. mole to mole ratio - ANSWER A ratio made from the coefficient in a
chemical equation (or from the subscripts in a chemical formula).
9. homogeneous mixture - ANSWER A mixture in which substances are
evenly distributed throughout the mixture
10.heterogeneous mixture - ANSWER A mixture in which different materials
can be distinguished easily
11.1 mole expressed in scientific notation - ANSWER 6.022X10^23
12.CN- - ANSWER Cyanide
13.HCl - ANSWER hydrochloric acid
14.C2H302- - ANSWER Acetate
15.NH4+ - ANSWER Ammonium
,16.CO32- - ANSWER Carbonate
17.ClO3- - ANSWER Chlorate
18.ClO2- - ANSWER Chlorite
19.PO43- - ANSWER Phosphate
20.OH- - ANSWER Hydroxide
21.NO3- - ANSWER Nitrate
22.SO42- - ANSWER Sulfate
23.The coefficients in a chemical equation represent the - ANSWER gives
the number of molecules, atoms or moles of that type of element
24.exothermic reaction - ANSWER A reaction that releases energy in the
form of heat
25.Endothermic - ANSWER (of a chemical reaction or compound) occurring
or formed with absorption of heat
, 26.linear fit - ANSWER a line intended to model the relationship between
variables.
27.Acid - ANSWER any compound that forms H+ ions in solution
28.limiting reactant (reagent) - ANSWER the reactant that is completely
consumed when a reaction is run to completion
29.percent yield formula - ANSWER actual yield/theoretical yield x 100
30.How many valence electrons does carbon have? - ANSWER Carbon has
4 valence electrons
31.How many valance electrons do halogens have? - ANSWER 7 valance
electrons
32.reaction rate - ANSWER the rate at which reactants change into products
over time
33.How does increasing temperature affect the rate of reaction? -
ANSWER increasing temperature caused the kinetic energy to increase.
Thus, Molecules are moving faster and colliding more frequently. This
causes the rate of reaction to increase.
34.Solid - ANSWER Definite shape and volume
