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Transcript of Welcome to AP Chemistry Mr. Giauque Room 123. What is AP Chemistry? l It is several things l...
![Page 1: Welcome to AP Chemistry Mr. Giauque Room 123. What is AP Chemistry? l It is several things l Equivalent of 1 year college inorganic chemistry class l.](https://reader034.fdocuments.us/reader034/viewer/2022050714/56649e265503460f94b15f06/html5/thumbnails/1.jpg)
Welcome to AP Chemistry
Mr. GiauqueRoom 123
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What is AP Chemistry? It is several things Equivalent of 1 year college inorganic
chemistry class A class that will prepare you for a test Monday,May 5 Hard work A wonderful learning experience
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Rules and Procedures You know the basic rules but here are a
few that are specific for this class No food, drink, gum or Cell Phones! LATE WORK If you forget to bring in your homework,
I will accept it ONE day late with a parent's signature, for full credit.
I will not accepted it any later.
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Rules and Procedures MAKE-UP WORK It is your responsibility to make up all
the work you missed. You have the same number of days that you were absent to turn in the missing work.
Pick up any missing work, and notes before or after class.
If you miss a test or quiz, it must be made up after school or during Advisory.
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Rules and Procedures Absences, Tardies & Early dismissal School Attendance Policy will be
followed. You will not leave my class early for
assemblies or another class. You have one day to make up the work
assigned.
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Rules and Procedures PASSES Since every minute of class time is
valuable, hall passes will be given only on an emergency basis.
Plan accordingly and come prepared to work.
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Rules and Procedures LAB- Because of the importance of
safety in the lab, violation of laboratory safety rules and procedures may result in loss of lab privileges.
Please Print and bring your lab saftey contract the first day of school.
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Grading Percentage scale
90-100% A
80-89% B
70-79% C
69-60% D
> 59% F
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Grading Quarter Grade
– Tests 50%– Homework/Classwork 15%– Quizzes 20%– Lab Reports 15%
Semester Grade– 40% from each quarter– 20% on final– AP exam determines grade S2 Final
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Exams Exams will be based on Chapter units or
topics. Exam corrections will be made for credit. First Semester Final will consist of questions
over the topics covered to date. Second Semester Final will be a Practice AP
Exam
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What you need for class Paper Pencil or pen, Calculator- scientific Ti 80 series Book? Lab Notebook (composition notebook)
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Why Third Period? College chemistry labs take more than
56 or 77 minutes, To do those labs we will have to come
early or stay late (Advisory & 1st lunch) I will let you know
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Any questions? Lets get started
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Significant figures Pgs… Meaningful digits in a MEASUREMENT Exact numbers are counted, have
unlimited significant figures If it is measured or estimated, it has sig
figs. If not it is exact. All numbers except zero are significant. Some zeros are, some aren’t
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Which zeroes count? In between other sig figs does Before the first number doesn’t After the last number counts iff it is after the decimal point the decimal point is written in 3200 2 sig figs
3200. 4 sig figs
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Doing the math Multiplication and division, same
number of sig figs in answer as the least in the problem
Addition and subtraction, same number of decimal places in answer as least in problem.
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More Preliminaries
Scientific Method
Metric System
Uncertainty
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Scientific method. A way of solving problems Observation- what is seen or measured Hypothesis- educated guess of why
things behave the way they do. (possible explanation)
Experiment- designed to test hypothesis leads to new observations, and the cycle goes on
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Scientific method. After many cycles, a broad, generalizable
explanation is developed for why things behave the way they do
Theory Also regular patterns of how things behave
the same in different systems emerges Law Laws are summaries of observations
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Scientific method. Theories have predictive value. The true test of a theory is if it can
predict new behaviors. If the prediction is wrong, the theory
must be changed. Theory- why Law - how
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Observations
Hypothesis
Experiment
Law
Theory(Model)
Prediction
Experiment
Modify
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Metric System Every measurement has two parts Number Scale (unit) SI system (le Systeme International) based
on the metric system Prefix + base unit Prefix tells you the power of 10 to multiply
by - decimal system -easy conversions
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Metric System Base Units Mass - kilogram (kg) Length- meter (m) Time - second (s) Temperature- Kelvin (K) Electric current- ampere (amp, A) Amount of substance- mole (mol)
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Prefixes giga- G 1,000,000,000 109
mega - M 1,000,000106
kilo - k 1,000 103
deci-d 0.1 10-1
centi- c 0.01 10-2
milli- m 0.001 10-3
micro- m 0.000001 10-6
nano- n 0.000000001 10-9
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Deriving the Liter Liter is defined as the volume of 1 dm3 gram is the mass of 1 cm3
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Mass and Weight Mass is measure of resistance to
change in motion Weight is force of gravity. Sometimes used interchangeably Mass can’t change, weight can
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Uncertainty Basis for significant figures All measurements are uncertain to
some degree Precision- how repeatable Accuracy- how correct - closeness to
true value. Random error - equal chance of being
high or low- addressed by averaging measurements - expected
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Uncertainty
Systematic error- same direction each time
Want to avoid this Better precision implies better accuracy you can have precision without accuracy You can’t have accuracy without
precision
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Dimensional Analysis
Using the units to solve problems
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Dimensional Analysis Use conversion factors to change the units Conversion factors = 1 1 foot = 12 inches (equivalence statement) 12 in = 1 = 1 ft.
1 ft. 12 in
2 conversion factors multiply by the one that will give you the
correct units in your answer.
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Examples 11 yards = 2 rod 40 rods = 1 furlong 8 furlongs = 1 mile The Kentucky Derby race is 1.25 miles.
How long is the race in rods, furlongs, meters, and kilometers?
A marathon race is 26 miles, 385 yards. What is this distance in rods, furlongs, meters, and kilometers?
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Examples
Science fiction often uses nautical analogies to describe space travel. If the starship U.S.S. Enterprise is traveling at warp factor 1.71, what is its speed in knots?
Warp 1.71 = 5.00 times the speed of light speed of light = 3.00 x 108 m/s 1 knot = 2000 yd/h exactly
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Apothecaries (druggists) use the following set of measures in the English system:
20 grains ap = 1 scruple (exact) 3 scruples = 1 dram ap (exact) 8 dram ap = 1 oz. ap (exact) 1 dram ap = 3.888 g 1 oz. ap = ? oz. troy What is the mass of 1 scruple in grams?
Examples
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Examples The speed of light is 3.00 x 108 m/s.
How far will a beam of light travel in 1.00 ns?
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Temperature and Density
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Temperature A measure of the average kinetic
energy Different temperature scales, all are
talking about the same height of mercury.
Derive a equation for converting ºF toºC
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0ºC 32ºF
0ºC = 32ºF
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100ºC 212ºF
100ºC = 212ºF
0ºC 32ºF
0ºC = 32ºF
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100ºC 212ºF0ºC 32ºF
100ºC = 212ºF0ºC = 32ºF
100ºC = 180ºF
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100ºC 212ºF0ºC 32ºF
100ºC = 212ºF0ºC = 32ºF
100ºC = 180ºF1ºC =
(180/100)ºF1ºC = 9/5ºF
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ºC
ºF
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ºC
ºF
(0,32)= (C1,F1)
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ºC
ºF
(0,32) = (C1,F1)
(120,212) = (C2,F2)
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Density Ratio of mass to volume D = m/V Useful for identifying a compound Useful for predicting weight An intrinsic property- does not depend
on what the material is
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Density Problem An empty container weighs 121.3 g. Filled
with carbon tetrachloride (density 1.53
g/cm3 ) the container weighs 283.2 g. What is the volume of the container?
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Density Problem A 55.0 gal drum weighs 75.0 lbs. when
empty. What will the total mass be when filled with ethanol?
density 0.789 g/cm3 1 gal = 3.78 L 1 lb = 454 g