Physical Science 20 - March 24

Hello everyone.  Sorry I haven't posted in a couple of days.  We haven't done anything new recently.  On Tuesday, students had time to prepare for their stoichiometry exam which was yesterday.  Today students started lab C4.  This lab is about stoichiometry and about verifying all this stuff we have been learning recently.  This is a rather large lab and students just started it today.  We will let it run throughout the Easter break.  After the break, we will continue with it.  Have a great Easter break everyone!!

Physical Science 20 - March 21

Today in class we finished up stoichiometry by looking at percent yield problems.  These are situations where you are given a certain amount of reactant and also given how much product that produces in an experiment.  Using stoichiometry, one can figure out how much product you should have produced, but due to experimental design and setup, these values are always more than what the experiment yielded.  We figured out how to calculate the percent yield of these situations.  These values should always be less then 100%.  These notes were covered on slides 26-30 in the notes and students then spent the rest of class working on Assignment C26. You will be given more time tomorrow to work on this.  You will need to know this for your stoichiometry exam on Wednesday, March 23.

Physics 30 - MArch 17

Happy St. Patrick's Day everyone!  Today in class we examined uniform circular motion.  This is a type of motion that happens with a constant speed but a changing direction.  A force called the centripetal force causes this type of motion.  We learned how to calculate the centripetal force along with the centripetal acceleration.  We then worked through a couple of examples (#19-22) today and students finished the class by working on Assignment 2.7.  Students will need to know it for the next in class assignment on Monday.  It is on Assignments 2.5 to 2.7.

Physics 30 - March 16

Today we didn't do much in class as we had reconciliation.  When we returned from reconciliation, I handed out some notes for tomorrows class so that we can move fairly quickly through the lesson tomorrow.  Your lab report for yesterday's lab is due as well tomorrow.  Make sure to complete that tonight.

Physical Science 20 - March 16

Today in class, we then learned how to do limiting reactant problems. These types of problems occur when we are given a certain amount of each reactant and we have to determine which one limits the amount of product formed.  The one that does is called the limiting reactant.  This involves doing stoichiometry twice, with each separate reactant to determine an amount of a certain product formed.  Whichever reactant yields the lower amount of product will be the limiting reactant.  This was all covered on slides 16-24 in the notes.  After we went over an example,  students were given time to work on Assignment C25 and questions 15 and 16 from C24.  We will go over these questions on Monday.  Reminder that tomorrow is your first unit exam on Nomenclature, Reactions and the Mole.

Physics 30 - March 15

Today we did lab 2.1 where we find the coefficient of static and kinetic friction of your shoe.  Students collected data today for their shoes.  We will talk about the lab report after the long weekend.  It will be due sometime after that.  If students were absent today, there is a set of sample data in the course notes link along the side of the webpage that you can use.

Physical Science - March 15

Today in class we went over one final example for stoichiometry.  This was on slide 13 and it involved using concentration to calculate the moles of the given substance.  I then assigned the rest of Assignment C24 to complete, excluding questions 15 and 16.  We will go over those questions in class tomorrow.

Physical Science 20 - March 14

Today in class we continued our journey with stoichiometry.  I went through one more example on slide 12 and then we had more time to work on Assignment C24.  Students were told to work on #5-8 now.  Tomorrow we will do one more example and then get time to finish Assignment C24.

Physics 30 - March 11

Today we looked at one more example about how to deal with friction on an incline by looking at Example 18.  With the remaining time in class, students were able to work on Assignment 2.6.  Reminder that on Monday we have our first in class assignment in this unit, which is on assignments 2.1-2.4.

Physical Science 20 - March 11

 Today in class we started to do some stoichiometry problems.  There is a new powerpoint called Stoichiometry Notes.  Students learned the steps we are going to take to do stoichiometry problems.  This was covered on slide 8 of the powerpoint. We then went through a couple of examples on slides 10 and 11 that outlined this process.  With the remaining time in class, students were told to work on Assignment C24 but just questions #1-4.  We will continue looking at some more examples on Monday and continue working on Assignment C24.

Physics 30 - March 10

Today we started to learn about how to handle friction on an incline.  In Period 1 we were interrupted by the grad meeting so we didnt quite get into doing the examples but we learned how to tackle the problems.  In Period 5, we did example 17 and started example 18.  We will finish it on Friday and students will then get time to work on Assignment 2.6.  

Physical Science 20 - March 10

Today we had the first day of stoichiometry.  We learned about molar ratios and how we can get those from a balanced chemical equation.  Afterwards, we did a couple of examples and but students didn't get enough time to work on Assignment C23.  This will be assigned tomorrow and due the next day.  We will continue on tomorrow by looking at stoichiometry problems.  The notes we took today are found on a powerpoint called Stoichiometry Notes and we just did slides 1-7. 

Physics 30 - March 9

Today we finished up our notes on static and kinetic friction and looked at an example of friction in two dimensions.  We did examples 16 and started example 17. This was covered on slides 49-56 in the powerpoint. Students were then given some time to work on Assignment 2.5. Tomorrow we will start to look at how we handle friction on an incline.

Physical Science 20 - March 9

Today in class we reviewed the mole and all the different molar conversions that we have learned so far.  We went through a series of examples that looked at the different conversions and some of the techniques that we will be using to determine which conversion we need to make.  This was all covered on slides 42-63 in the powerpoint.  Students spent the remainder of the class working on Assignment C22.  We will go over this tomorrow and then begin stoichiometry.

Physics 30 - March 8

Today we continued on the unit by looking at friction and how friction works.  We talked about what friction depends on and then we studied kinetic friction specifically.  We started example 13 in the notes.  Tomorrow we will finish example 13, do example 14 and then look at static friction.

Physical Science 20 - March 8

Today students wrote their quiz on the mole.  After the quiz, we learned how one more molar conversion - how to convert liters of a gas at STP (Standard Temperature and Pressure) to moles.  This involved using molar volume.  Molar volume (22.4 L/mol) means that at STP, 1 mole of all gases occupy the same amount of space.  We went through a couple of examples that outlined the process of doing these conversions.  This was covered on slides 36-41.  Students then spent the rest of the class working on Assignment C21.  We will go over this tomorrow and review everything we have covered so far on the mole.

The first exam date has also been set.  It will happen next Wednesday, March 16.  It will be on nomenclature, reactions and the mole.  Study all assignments that I have taken in and the quizzes we have done.

Physics 30 - March 7

Today we started to look at specific types of forces.  We began with an examination of the force of gravity.  This is also called an object's weight, although not to be confused with an object's mass.  The one lesson I wanted students to learn today is that mass and weight do not mean the same thing.  Mass is a measure of the amount of matter an object has whereas weight is the force of gravity on that object.  One is measured in kilograms, the other in newtons. 

We learned about the differences between weight and the normal force and also learned what exactly a bathroom scale is measuring.  The concept of apparent weight is really important for students to understand.  This was all covered on slides 36 to 42.  Students were given some time to work on Assignment 2.4 at the end of class, which we will take up tomorrow. 

Physical Science 20 - March 7

Today we learned about molarity and solutions (slides 23-35), and how we can molarity to convert molar quantities.  We did a couple of examples (slides 27&28).  I assigned C20 at the end of the period.  We will go over this tomorrow.  Reminder that tomorrow you have your mole quiz.  To prepare for this, study Assignments C18 and C19.

Physics 30 - March 4

Today in class we learned about Newton's Third Law of Motion, or the action-reaction law.  We learned about the implications of such an important law and how often we use this law and don't realize it.  I assigned Assignment 3.3 at the end of the class.

Physical Science 20 - March 4

Today in class we went through the process for how to write a formal lab report.  Students will need to follow this process for every formal lab we do.  Students then got the remainder of the period to write the report for the lab we did yesterday and they handed the report in at the end of the period.  If they finished before the end of the period, they then had to work on Assignments C18 and C19.  These assignments will serve the basis for the Mole Quiz next Tuesday.  Have a great weekend everyone.

Physics 30 - March 3

Today in class, students learned about Newton's Second Law of Motion.  We went through a couple of examples that outline the relationships that exist between mass, force and acceleration and then had time to work on Assignment 2.2.  This was covered on slides 22-31 in the Unit 2 Notes powerpoint. Tomorrow we will finish Newton's Laws of Motion by learning about the 3rd law of motion.

Physical Science 20 - March 3

Today in class we went over them Assignment C18 and C19.  The answers are posted in the answer key folder in the course notes link.  Most students were not finished doing these assignments.  They should have them completed by next Tuesday as these assignments will serve the basis for the quiz that day.  Students then had a chance to do the first lab of the year.  This was called Lab C2 - The Art of Chemistry.  If students were absent today, there is a set of sample data in the Chemistry folder.  It is called Lab C2 Sample Data.  Use that to complete the lab report.

Physical Science 20 - March 2

Today students had a period to work on Assignments C18 and C18.  We will go over the answers to them tomorrow.

Physics 30 - March 1

We learned about Newton's First Law of Motion today, or the Law of Inertia.   After students took a couple of slides of notes (slides 16-17) we then looked at many different examples of inertia as well as a couple of interesting demonstrations of the first law.  There was no assignment that went along with this lesson.  Students can work on Assignment 2.1.  Reminder that tomorrow is our first unit exam.  Please remember to bring a calculator, pencil and eraser.  I will provide the formula sheet

Physical Science 20 - March 1

Today in class we began to look at how to convert information using the idea of the mole.  This involved using the molar mass to convert from the mass of a substance to moles of the substance and visa versa.  As well, we can use Avogadro's number to convert from the number of particles of a substance to the moles of the substance and visa versa.  We then did an example where we converted to the number of molecules given the mass of a substance in grams.  We also learned how to find the mass of a certain number of atoms of the substance.  These two examples involved 2 steps, first converting our given information into moles and then converting from moles into the required.  Students then had a chance to work on Assignments C18 & C19. This was all covered on slides 16 - 19 in the powerpoint called The Mole.  Students were assigned Assignments C18 and C19 but we will get some more time tomorrow to work on this.