Recording of 4/25 chemistry class: Molarity

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4/25 Chemistry update and homework due 5/2

Hi folks,

Today we spent a bit more time with the concept of limiting reagents. The quizzes pointed out that there is still some issues with that concept. We then moved on to the concepts of concentration, molarity and dilution. Today's lab consisted of working with acids and bases, titration and molarity.

Homework for this week is to answer the questions on the enclosed .pdf as well as finish off the calculations for the lab we did in class.

4/11 Chemistry update and homework due 4/25

Hi folks,

This week we reviewed and compared entropy, heat capacity and exothermic/endothermic reactions.  We also did a lab finding the pH's of a variety of household substances.

Homework due 4/25 is to:

Complete the enclosed .pdf

Using the simulation at this link  follow the directions below and answer the questions.  

Pull the red handle what do you see happen?

Now launch the C ball, what do you see happen?

Explain difference

Click on Many Collisions

Pump in some A

Pump in some BC

Note reaction at the bottom

Increase heat, what happens to total average energy as you do

Watch the current amounts of reactant and product.  What is happening with them now?

Is this endothermic or exothermic

Is entropy increasing or decreasing?

Would this reaction take place spontaneously?

Hit Reset all

Now change reaction to the bottom A + BC

Pump in some molecules of A and BC

What happens?

Is this endothermic or exothermic

What happens to entropy?

Would this reaction take place spontaneously?

Hit Reset all

Change reaction to the second A + Bc

Pump in some molecules of A and BC

What happens?

Do you have to do anything to get the reaction to take place?

Is this endothermic or exothermic

What happens to entropy?

Would this reaction take place spontaneously?

Hit reset all

Change reaction to the 3^rd A+BC

Pump in some molecules of A and BC

What happens?

Do you have to do anything to get the reaction to take place?

Is this endothermic or exothermic

What happens to entropy?

Would this reaction take place spontaneously?

No Science Jim Chemistry Class This Week

Hi folks,

Just a reminder that there is no chemistry class this Friday due to Spring Break.

See you all next week!

Science Jim

Recording of Chemistry class week 27: Entropy

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4/4 Chemistry update and homework due 4/11

Hi folks,

Today we got into the confusing topic of entropy. The tendency for the universe to favor disorder over order.

For homework this week:

Read pgs. # 294 - 299
Do review questions #'s 34 to 38 on pg. 302
Do Exercises #'s 30-37 on pg. 304