Thursday, Jan. 16 th : A Day Friday, Jan. 17 th : B Day Agenda
Homework questions/collect (Pg. 432: #1-12) 2 nd combined gas law
example and Rock Me Avogadro video for review before quiz Sec quiz:
The Gas Laws Lab discussion/write up: Charles Law: The Effect of
Temperature on Volume Gas Laws and Drinking Straw Activity Lab next
time - dress appropriately! Homework Questions Pg. 432: #1-12
Questions/Problems? Hand In Additional Example A gas at STP
occupies 28 cm 3 of space. If the pressure changes to 3.8 atm and
the temperature increases to 203C, find the new volume. Use the
combined gas law: P 1 V 1 = P 2 V 2 T 1 T 2 P 1 = 1.00 atm V 1 =
28.0 cm 3 T 1 = 0C = 273 K P 2 = 3.8 atm T 2 = 203C = 476 K V 2 =
12.8 cm 3 Sec quiz The Gas Laws You may use your book, notes, and a
calculator to complete the quiz on your own. Question #5 was NOT
covered in this sectionthe answer is (C) Dalton. Good Luck! Lab:
Charles Law: The Effect of Temperature on Volume Background
According to the kinetic-molecular theory, an increase in
temperature will cause the molecules of a gas to move faster and
exert more pressure, causing the gas to expand. Conversely, as a
gas cools, the molecules move more slowly and the gas will
contract, or exert less pressure. The relationship between the
volume of a gas and its temperature is known as Charless Law. Lab:
Charles Law: The Effect of Temperature on Volume Title, Purpose and
Hypothesis You will have to read through the lab to find the
purpose of this lab and write your hypothesis statement. Lab:
Charles Law: The Effect of Temperature on Volume Changes to
Materials List Remember, 1 cm 3 = 1 mL You will use a hot plate NOT
a bunsen burner. Change thermometer to temperature probe. You will
need a 100 mL graduated cylinder, NOT a 50 mL. Cross out the
barometer we dont have one. I will look online to find the
atmospheric pressure. Lab: Charles Law: The Effect of Temperature
on Volume Procedure The procedure for this lab is pretty straight-
forward and we will follow the directions in the lab handout. I
have graph paper for you to use to graph your data. Lab: Charles
Law: The Effect of Temperature on Volume Lab Write-up and
Reflection Statement With a partner of your choice, complete the
lab write-up. Dont forget to leave space for the reflection
statement. Be sure to update your table of contents in your lab
folder. We will be in the lab next time: dress appropriately! Gas
Laws & Drinking Straws Activity Pre Lab Question (Answer on the
back of your post-lab question sheet) Why can we drink through a
straw? try to explain it without using the word suck in your
description Activity #1 Fill your cup full of water. Put your straw
in the cup. Place one finger over the straw and lift it out of the
water. Observe the water in the straw carefully. Activity #2 Grab a
second straw. Put both straws into your mouth. Lower one of them
into the glass and the other should be outside of the glass. Try to
drink the water through the straw in the glass Activity #3 Tape two
straws together end to end and drink from them. Continue to add
straws until you have a total of 8 straws taped together. Try
drinking out of your elongated straw vertically and as horizontally
as possible. Activity #4 (demonstration) Use flexible tubing to
make a giant straw on the stairwell. Post Lab Questions 1.Why does
the water stay in the straw in activity #1? 2.Why cant you drink
very well in activity #2 (two straws in your mouth)? 3.Why is there
a limit to the height of a straw you can drink from? 4.What is the
maximum theoretical height through which you can drink? Atmospheric
pressure = 760 mmHg Mercury is 13.7 times more dense than water
is.
