Saturday, October 10, 2009

SEPT 17, 2009 - Unit Conversions review / Salt water lab [CHRISTIAN]

Class started out, with a review on unit conversions, giving us a few examples on the board.

Examples:

1. Change 120kg into mg.

(120kg/1)(1000g/1kg)

(120kg)(1000g/1kg)

= 120 000 000mg(in SD: 1.2×10^8)

2. 7.25 L/S into mL/min

(7.25L/S)(60 S/min)(1000mL/L)

(7.25L/S)(60 S/min)(1000mL/L)

(7.25/s)(60 /min)(1000mL)
= 435000mL/min(SD: 4.35×10^5)

3. 174kg/s into Mg /h

(174kg/s) (3600s/h)(MG/1000kg)

(174kg/s)(3600s/h)(MG/1000kg)

(174)(3600)(MG/1000)
= 626.4 Mg/h

Lab:
The experiment consisted of salt, and water, and to figure out what is the maximum amount of table salk you candissolve in 200mL of water(Although wec hanged the volume of water)

The lab was to figure out the amount of salt that can be a volume of water. First trial was with 10mLs, 2nd trail was with 20mLs, 3rd was with 30mLs and the last, and 4th trail was with using 40mL. Then the groups were suppose add salt slowly and stir, while using the electronic scale until salt cannot be mixed anymore and you could see bits of salt floating in the water. At that point, you minus the previous weight with the current weight, and you get the mass of salt. Groups were suppose to do that with 4 trials and draw out a graph, and using that graph make a line of best fit. And using that line of best fit, take an educated guess at the amount of salt 200mL of water can hold.

Posted By: Christian B

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