Density And Conservation Laws Worksheet (Page 3 of 3) in pdf

Density And Conservation Laws Worksheet Page 3

likelihood of inaccuracies will occur because different particles will attach themselves to

the different pennies.

Part 3 - Conservation of Volume:

1. Was volume conserved in this experiment?

Volume in this experiment was not conserved by the results because 20mL of water were

in the graduated cylinder and 20mL of alcohol was added and the mixture producing

36mL instead of 40mL. The reason the results didn’t match is because the density of

water and alcohol are different which affected the results.

2. Let a = alcohol, w = water, mix = alcohol and water mixture

If we accept the Law of Conservation of Mass, then,

Ma + Mw = Mmix

Given that D = M/V, M= D*V

Substituting,

Da*Va + Dw*Vw = Dmix*Vmix

Assuming the above to be true, under what conditions will volume be conserved?

Use your experimental value for the density of alcohol (in part one) and assume the

density of water to be 1.00 g/ml, support your argument.

The density of alcohol is .76051g/mL from part one results and the density of water is

1.0g/mL therefore substituting these results into the equation:

Da*Va + Dw*Vw = Dmix* Vmix

0.76051g/mL * 20mL + 1.0g/mL * 20mL = 0.97573g/mL * 36mL

15.2102g + 20g = 35.12628g

35.2102g = 35.12628g

Indicates that conservation of mass and volume are conserved when the density of the

mixture is calculated.

Density And Conservation Laws Worksheet Page 3