# Lecture 10 Temperature and Pressure

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1. What causes the percent yield to be less than 100%? (limiting reagent)
Not enough of something (look at the ratio thing by number of moles in chemical equation)
2. Percent yield
The percent of the theoretical yield actually obtained from a chemical reaction
3. The percent of the theoretical yield actually obtained from a chemical reaction
Percent yield
4. How do you convert kelvin to Celsius?
subtract 273.15 from the kelvin temp
5. subtract 273.15 from the kelvin temp
How do you convert kelvin to celsius?
6. How do you convert celsius to Fahrenheit?
• C --->F
• f= (celsius x 9/5) +32
7. How do you convert fahrenheit to celsius?
celsius = (fahrenheit - 32) / 1.8
8. Alcohol thermometers can be used over a temperature range from -115c (the melting point of alcohol) to 78.5c. What is the effective temperature range of the alcohol thermometer in ?
• Switch from celsius to fahrenheit.
• -175f to 173 f. Do max - min (173 - -175) and bam!
9. Convert 1.10atm of pressure to its equivalent in millimeters of mercury.
multiply 1.10atm by 760 mmHg
10. Converting pascals to atmospheres.
figure this out later
11. How many pascals are in a kilopascal?
1,000 (kilopascal will be the smaller number between the two.)
12. How do you convert pascal to kilopascal?
Divide by 1000.
13. How do you convert kilpascal to pascal.
multiply by 1000
14. How do you convert pascals to torr?
Divide number of pascals given by 133.32 (number of pascals in 1 torr)
15. How many mmHG are in 1 atm
760 mmhg
16. How many pascals are in 14.7 psi?
101,325
17. How much psi in 1 atm amd 760 torr?
14.7 psi
18. how many torr are in 1 mmHg?
1 torr
19. How many Pascals are in 1 torr?
133.32 Pa
20. REMINDER! Don't forget to change celsius to kelvin when doing calculations!
21. Which equation should be used when amount of gas and volume is constant?
p1/t1 = p2/t2 (That gay luke guy's law)
22. How do you determine pressure of gas using manometer?
Take the number of cm difference but make sure it's in mm.. (x10 it for cm to mm) then add mmHg if pressure is higher with gas
23. What do you do mathmatically if pressure is higher from mmhg
you would subtract number of mm difference given
24. when looking for T2 in gay guy equation
T2= P2 x T1 / P1

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 Author: yourmomhaslice ID: 206462 Filename: Lecture 10 Temperature and Pressure Updated: 2013-03-15 06:52:52 Tags: Chem exam2 temperature pressure Folders: Description: this will be on exam 2 Show Answers:

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