Lecture_Notes_082809a

# Lecture_Notes_082809a - A candy recipe calls for heating a...

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Combined Calculations y Perform one operation with the correct number of significant figures and then the other with correct significant figures.

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Prefixes
Dimensional Analysis y Unit conversion y Units must always be reported, you will lose points if you have no units even if the number is correct

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Dimensional Analysis y A runner wants to run 43.0 km. The runners pace is 5.2 miles per hour. How many minutes do they need to run? 1 mile = 1.6093 km
A European car has a gas mileage of 14 km/L. What is the gas mileage in miles per gallon? 1 mi = 1.6093 km; 1 gal = 3.7854 L 87% 3% 7% 4% 33 mi/gal 53 mi/gal 8.7 mi/gal 14 mi/gal 1. 33 mi/gal 2. 53 mi/gal 3. 8.7 mi/gal 4. 14 mi/gal

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Temperature Conversion
Temperature Conversion -40 o F=-40 c C!

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Temperature Conversion y The high temperature record for the continent of Africa is 136 o F, recorded at Azizia, Libya, in 1922. What is this temperature in degrees Celsius and Kelvin?

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Unformatted text preview: A candy recipe calls for heating a sugar mixture to the “soft ball” stage (234 to 240 o F). Can a laboratory thermometer with a range of -10 o C and 110 o C be used for this measurement? Y es N o 87% 13% 1. Yes 2. No o C = ( o F – 32) x (5/9) Density y A new penny has a mass of 2.49 g and a volume of 0.349 cm 3 . Is the penny made of pure copper? Matter Classification y Definition: Anything that has mass and occupies space y Three different phases: Phase Definite Volume? Definite Shape? Matter Classification Pure Substances y Element: A substance that cannot be decomposed into simpler substances by chemical means y Compound: A substance with constant composition that can be broken down into elements by chemical processes Mixtures y Homogeneous: cannot be visibly separated y Heterogeneous: can be visibly separated...
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Lecture_Notes_082809a - A candy recipe calls for heating a...

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