WGU D425 INTRODUCTION
TO CHEMISTRY PA AND OA
EXAM QUESTIONS AND
CORRECT ANSWERS LATEST
UPDATE 2026/2027 GRADED A+ .
,1. Calculate the density of 10.4g/mL sample of a substance with a mass of
35.12g. Enter the answer in the correct number of significant figures and include the unit g/mL: (v=m/d), 3.38ml
2. convert 12.5g in to kilograms. enter answer in kg ✔✔ CORRECT ANSWER 0.0125
3. calculate the density of an object that has a mass of 19.378 and a volume of
15.0 ml. enter as g/ml ✔✔ CORRECT ANSWER 1.29g/ml
4. a substance has a mass of 42.10g. if the density of the substance is known to be 2.431g/ml what volume of
substance is present ✔✔ CORRECT ANSWER 17.3ml
5. several samples of a metal weighed and placed into a graduated cylinder filled with water to measure their
volume by water displacement ✔✔ CORRECT ANSWER Subtract inital volume from final volume, 1ml= 1cm^3, D=M/V
6. several samples of metal were weighed and placed into the graduated cylinder filled water to measure
their volume by water displacement q ✔✔ CORRECT ANSWER
7. Dimensional Analysis Ex.
how many centimeters are there in 3.55m quantity given
3.55m
3.55m * (100cm/1m)= ✔✔ CORRECT ANSWER 3.55m=355cm
8. Density converted between mass and volume of a substance 30.2ml sample of ethyl alcohol with a
mass of 23.71002g ✔✔ CORRECT ANSWER p=0.785g/ml
9. Find mass of and object. density of alcohol is 0.7892g/mL, so alcohol is 0.7892g per 1ml. determine the
mass of alcohol for 2.0mL use ✔✔ CORRECT ANSWER 1.5784g=1.5g
10. Density = mass/ ✔✔ CORRECT ANSWER volume
11. Density of an object?
mass of 2.4019 and volume of 1.40mL ✔✔ CORRECT ANSWER density = 1.7156g/mL= 1.72g/ml
12. Density of an object?
volume of 32mL and a mass of 12.24g ✔✔ CORRECT ANSWER density= 0.3825g/mL=0.38g/mL
13. density of an object ✔✔ CORRECT ANSWER
mass of 78.2g/14.2cm^3 ✔✔ CORRECT ANSWER density= 5.507g/cm= 5.51g/cm^3
14. density of an object ✔✔ CORRECT ANSWER
,22.57cm^3/55g ✔✔ CORRECT ANSWER density= 2.43686g/cm^3= 2.4g/cm^3
, 15. density of an object ✔✔ CORRECT
ANSWER 85g/35mL ✔✔ CORRECT ANSWER density=
2.42857 g/mL= 2.4g/mL
16. what is the mass of 25.0mL of octane, with a density of 0.702 g/cm
-Given ✔✔ CORRECT
ANSWER25.0mL conversion
factors ✔✔ CORRECT
ANSWER
1.1mL
2.0.0702=1cm^3 (mL->cm^3->g)
25.0mL*1cm^3/mL*0.702g= ✔✔ CORRECT ANSWER density= 17.55g= 17.6g
17. the density of titanium is 4.51g/cm^3. What is the volume in cubic inches of 3.5Ib of titanium ✔✔
CORRECT ANSWER
conversion factors ✔✔ CORRECT ANSWER
1) 2,2Ib=1Kg
2) 1Kg=10^3g
3) 4.51g= 1cm^3
4) 2.54cm= 1 in Find in^3 Ib-> Kg ->
g-> cm^3 -> in^3
3.5Ib* 1Kg/2.2Ib*10^3g/1Kg*1cm^3/4.51g*1in/2.54cm must multiply
(1in/2.54cm)^3=1in^3/16.387cm^3
3.5Ib*1Kg/2.2Ib*10^3g/1Kg*1cm^3*1in^3*16.38cm^3 ✔✔ CORRECT ANSWER density= 21.53in^3= 22in^3
18. Calculate the density in g/mL of aluminum with a volume of 0.6cm^3 and a mass of 4.6mg ✔✔
CORRECT ANSWER
Given ✔✔ CORRECT ANSWER 4.6mg and 0.6cm^3
Formula for Density ✔✔ CORRECT ANSWER mass (g)/volume(ml) Find ✔✔ CORRECT ANSWER
Density ✔✔ CORRECT ANSWER1) mg->g
4.6mg*10^-3g/1mg= 4.6*10^-3g=
TO CHEMISTRY PA AND OA
EXAM QUESTIONS AND
CORRECT ANSWERS LATEST
UPDATE 2026/2027 GRADED A+ .
,1. Calculate the density of 10.4g/mL sample of a substance with a mass of
35.12g. Enter the answer in the correct number of significant figures and include the unit g/mL: (v=m/d), 3.38ml
2. convert 12.5g in to kilograms. enter answer in kg ✔✔ CORRECT ANSWER 0.0125
3. calculate the density of an object that has a mass of 19.378 and a volume of
15.0 ml. enter as g/ml ✔✔ CORRECT ANSWER 1.29g/ml
4. a substance has a mass of 42.10g. if the density of the substance is known to be 2.431g/ml what volume of
substance is present ✔✔ CORRECT ANSWER 17.3ml
5. several samples of a metal weighed and placed into a graduated cylinder filled with water to measure their
volume by water displacement ✔✔ CORRECT ANSWER Subtract inital volume from final volume, 1ml= 1cm^3, D=M/V
6. several samples of metal were weighed and placed into the graduated cylinder filled water to measure
their volume by water displacement q ✔✔ CORRECT ANSWER
7. Dimensional Analysis Ex.
how many centimeters are there in 3.55m quantity given
3.55m
3.55m * (100cm/1m)= ✔✔ CORRECT ANSWER 3.55m=355cm
8. Density converted between mass and volume of a substance 30.2ml sample of ethyl alcohol with a
mass of 23.71002g ✔✔ CORRECT ANSWER p=0.785g/ml
9. Find mass of and object. density of alcohol is 0.7892g/mL, so alcohol is 0.7892g per 1ml. determine the
mass of alcohol for 2.0mL use ✔✔ CORRECT ANSWER 1.5784g=1.5g
10. Density = mass/ ✔✔ CORRECT ANSWER volume
11. Density of an object?
mass of 2.4019 and volume of 1.40mL ✔✔ CORRECT ANSWER density = 1.7156g/mL= 1.72g/ml
12. Density of an object?
volume of 32mL and a mass of 12.24g ✔✔ CORRECT ANSWER density= 0.3825g/mL=0.38g/mL
13. density of an object ✔✔ CORRECT ANSWER
mass of 78.2g/14.2cm^3 ✔✔ CORRECT ANSWER density= 5.507g/cm= 5.51g/cm^3
14. density of an object ✔✔ CORRECT ANSWER
,22.57cm^3/55g ✔✔ CORRECT ANSWER density= 2.43686g/cm^3= 2.4g/cm^3
, 15. density of an object ✔✔ CORRECT
ANSWER 85g/35mL ✔✔ CORRECT ANSWER density=
2.42857 g/mL= 2.4g/mL
16. what is the mass of 25.0mL of octane, with a density of 0.702 g/cm
-Given ✔✔ CORRECT
ANSWER25.0mL conversion
factors ✔✔ CORRECT
ANSWER
1.1mL
2.0.0702=1cm^3 (mL->cm^3->g)
25.0mL*1cm^3/mL*0.702g= ✔✔ CORRECT ANSWER density= 17.55g= 17.6g
17. the density of titanium is 4.51g/cm^3. What is the volume in cubic inches of 3.5Ib of titanium ✔✔
CORRECT ANSWER
conversion factors ✔✔ CORRECT ANSWER
1) 2,2Ib=1Kg
2) 1Kg=10^3g
3) 4.51g= 1cm^3
4) 2.54cm= 1 in Find in^3 Ib-> Kg ->
g-> cm^3 -> in^3
3.5Ib* 1Kg/2.2Ib*10^3g/1Kg*1cm^3/4.51g*1in/2.54cm must multiply
(1in/2.54cm)^3=1in^3/16.387cm^3
3.5Ib*1Kg/2.2Ib*10^3g/1Kg*1cm^3*1in^3*16.38cm^3 ✔✔ CORRECT ANSWER density= 21.53in^3= 22in^3
18. Calculate the density in g/mL of aluminum with a volume of 0.6cm^3 and a mass of 4.6mg ✔✔
CORRECT ANSWER
Given ✔✔ CORRECT ANSWER 4.6mg and 0.6cm^3
Formula for Density ✔✔ CORRECT ANSWER mass (g)/volume(ml) Find ✔✔ CORRECT ANSWER
Density ✔✔ CORRECT ANSWER1) mg->g
4.6mg*10^-3g/1mg= 4.6*10^-3g=
