General Chemistry Lab I-DAX-DL01

Lab Report # 3 – Density Post lab Questions

Density Problem Worksheet #2 (8)
Density Work Sheet #1 (11)

Density Work Sheet

A. SAME MASS
Each block has the same mass. Determine the density and draw conclusions regarding density of objects
with the same mass. What do you notice in your answers for #1 and #2? Explain your observation.

Object Mass Volume Density Float or sink in
water?

1 5.00 g 4.00 cm3
2 5.00 g 10.00 cm3
3 5.00 g 2.50 cm3
4 5.00 g 1.23 cm3

B. SAME VOLUME
Each block has the same volume. Determine the density and draw conclusions regarding density of objects
with the same mass. What do you notice in your answers for #1 and #2? Explain your observation.

Object Mass Volume Density Float or sink in
water?

1 6.00 g 5.00 cm3
2 8.00 g 5.00 cm3
3 4.00 g 5.00 cm3
4 2.00 g 5.00 cm3

C. SAME DENSITY
Each block has the same density. Determine the density and draw conclusions regarding density of objects
with the same mass. What do you notice in your answers for #1 and #2? Explain your observation.

Object Mass Volume Density Float or sink in
water?

1 3.00 g 3.75 cm3
2 4.00 g 5.00 cm3
3 2.00 g 2.50 cm3
4 1.00 g 1.25 cm3

D. MISTERY OBJECTS
Each object is a mystery object. Your job is to fill in the table below to determine what material each
object is made of.

Calculate the density and determine whether each block will float or sink in water.

Check the table below and determine what material each block is made out of.

Object Mass Volume Density Float or sink
in water?

Material the object
is made of

1 65.14 g 3.38 cm3
2 0.64 g 1.00 cm3
3 4.08 g 5.83 cm3
4 3.10 g 3.38 cm3
5 3.53 g 1.00 cm3

DENSITY OF COMMON OBJECTS

ethanol (grain alcohol) 0.810

gasoline 0.700

ice 0.920

water at 20°C 0.998

water at 4°C 1.000

seawater 1.03

milk 1.03

coal 1.1-1.4

apple 0.640

magnesium 1.7

granite 2.6-2.7

diamond 3.53

steel 7.8

iron 7.8

copper 8.3-9.0

lead 11.3

mercury 13.6

gold 19.3

platinum 21.4

• A. Same mass
• B. Same volume
• C. Same density
• D. Mistery objects
• Density of common objects

Density Problem Set
Due 9/28/18

Only one set of answers per team

Question 1

2) A 50.0-g silver object and a 50.0-g gold object are both added to 75.5 mL of
water contained in a graduated cylinder. What is the new water level, in milliliters, in the
cylinder? You will need to find the densities of the objects.

3) A mouthwash is 21.6% ethanol by mass. If each bottle contains 0.358 pt of
mouthwash with a density of 0.876 g/mL, how many kilograms of ethanol are in 180
bottles of the mouthwash?

4) A new penny has a mass of 2.49 g and a volume of 0.349 cm3. Is the penny pure
copper?

Question 5

6) A hybrid SUV consumes fuel at a rate of 12.8 km/L. How many miles can the car
travel on 22.5 gal of gasoline?

7) You measure the masses and volumes of two cylinders. The mass of cylinder 1 is
1.35 times the mass of cylinder 2. The volume of cylinder 1 is 0.792 times the volume of
cylinder 2. If the density of cylinder 1 is 3.85 g/cm3 , what is the density of cylinder 2?