March19

Agenda: Tuesday, March 19th, 2013

1) Warm-up – 20 min2) Finish Endothermic/Exothermic Notes – 20 min3) Review Unit Topics: Condensation, Coefficients – 50 min4) CST prep – 20 min5) Homework: Study for Quiz on Friday on Conservation of Mass, Phase Transitions, Chemical Reactions, Chemical/Physical Change, and Endothermic/Exothermic Reactions.

Warm-up

Write in your interactive notebook

1) What is one thing that you learned in this unit?2) What is one thing that you have a question about?3) Ask your elbow partner what you wrote for #2. Answer it together or write down how you would find the answer to your question.4) Draw an example of an endothermic reaction, and an example of an exothermic reaction.

Review: Condensation

Condensation is the change from Gas to Liquid

What are some examples of condensation?

Some examples are:- mist on car windows- water that forms on the mirrors after a shower- water drops forming on the outside of a cold cup of water

What makes condensation occur?

Just like water freezes when it gets cold enough, water vapor in the air condenses into liquid when it is cold enough.

So do you mean to say there are water molecules in the air?

Yes! Water is gaseous form is called water vapor, and humidity is the measure of water vapor in the

air.

Places that have little water vapor have LOW humidity. And places that have a lot have HIGH

humidity. Which of the places below has low humidity?

So how does water form on the outside of the cup?

CHALLENGE question: Why does more water form on the outside of a cold cup than a regular

cup?

On the next page of your notebook, set up your sheet like Mr. Lee does.

You will have have fifteen minutes to complete this chart and Mr. Lee will stamp it.

Coefficients

Turn your notebook to the vocabulary cards in the back. We will be adding 3 terms.

What is a coefficient? What is a subscript?

A coefficient is the BIG number in front of a chemical formula. The coefficient tells you how many MOLECULES there are.

How many H2 molecules are there? H20 molecules?

A subscript tells you how many ATOMS there are in a molecule

How many TOTAL atoms of Hydrogen are on the left side of the arrow?

How many TOTAL atoms of Oxygen are on the left side of the arrow?

How many TOTAL atoms of Hydrogen and Oxygen are on the right side of the arrow?

The blue 2 shows there are 2 atoms of hydrogen in one molecule. And there

are two of the (H2) molecules

Remember, the atoms on the left and right side of the arrow must be the same. This is because of

the law of conservation of mass.

Law of conservation of mass: the number of atoms must be the same in the reactants and

products

On a separate sheet of paper, number your sheet #1-3 and skip 6 lines between each number. Draw the chemical equation then write how many atoms

there are of each element in the reactants and products.

You'll have fifteen minutes. This worksheet is worth 20 points.

1) 2H2 + O

2 → 2H

2O

2) C2H

8O

4 → 2CH

4 + O

2

3) C

6H

12O

6 + 6O

2 → 6CO

2 + 6H

2O

We will now start preparing for CST's

We will answer 3 questions today on the CST.

You have 3 minutes for each question.

Study for your quiz!!!!!!!!!!!!!