Density questions

TAKS formula chart

Density formula is here.

Finding volumes of regular objects and irregular objects.

1) Measure the volume of liquid in a partially filled graduated cylinder,

2) Add the solid (making sure it is submerged) and note how the level of the liquid goes up,

3) Measure the combined volume of the solid and liquid. The difference between the initial and final volumes is the volume of the solid.

Metal Density

Gold 19.3

Silver 10.5

Platinum 21.4

Palladium 12.0

Copper 9.0

9ct10.9 to

12.7

14ct12.9 to

14.6

18ct Yellow15.2 to

15.9

18ct White14.7 to

16.9

22ct17.7 to

17.8

Sterling Silver10.2 to

10.3

950 Platinum 20.1

http://www.syvum.com/cgi/online/serve.cgi/members/gillilandd/quizzes/density.tdf Try this hyperlink’s 10 questions to see if you understand the concept of density.

Density less than ‘1’ floats on water.Density more than ‘1’ sinks in water.

What is the mass of a 600.00 mL sample of seawater with a density of 1.025 g/mL?

• 781.25 g

• 615.0 g

• 585.4 g

• 0.002 gD = m ÷ v1.025 = ? ÷ 6001.025 x 600 = ? ÷ 600 x 600 = 0.0017

What is the density at 20oC of 16.0 milliliters of a liquid that has a mass of 3.05 grams?

• 5.25 g/mL

• 48.8 g/mL

• 0.191 g/mL

• 0.320 g/mL

mass

volume

3.05 / 16 = .1906

• A sample of an element has a volume of 68.0 mL and a density of 1.85 g/mL. What is the mass in grams of the sample?

1.85 x 68 = 125.8 grams

A block of maple wood with a volume of 8.05 cubic centimeters and a density of 0.67 g/cm3 is sawed in half. The density of the two smaller blocks is now—

• One fourth the original density.• The same as the original density.• One half the original density.• Two times the original density.

Which of the following objects will float in water?

• a cube with a mass of 25 g and a volume of 20 mL• a cube with a mass of 36 g and a volume of 35 mL• a pyramid with a mass of 29 g and a volume of 32 mL• a pyramid with a mass of 28 g and a volume of 26 mL

The one who’s density is less than 1.

If the properties of water were to change so that the solid form was denser than the liquid form, organisms living in a cold pond environment would be less likely to survive because water would no longer –

●Dissolve enough oxygen from the air.●Produces solutions containing vital

nutrients.●Remain neutral, instead becoming

highly acidic.●Produce a floating insulation layer of

ice.

The table shows the physical properties of selected metals.

A cube of an unknown metal has a volume of 2.25 cm3 and a mass of 16.2 g. Based on data in the table above, what is the identity of this metal?

A. bismuth.

B. chromium.

C. polonium.

D. ruthenium.

Mass / volume= density 16.2/2.25 = 7.2

Use this hyperlink to practice doing more density problems. Have a calculator handy.

Click on 'New Problem'

http://www.psigate.ac.uk/newsite/reference/chemlecs/densitycs.html