1. Agenda: Tuesday, March 19th,
2013
1) Warm-up – 20 min
2) Finish Endothermic/Exothermic Notes – 20 min
3) Review Unit Topics: Condensation, Coefficients
– 50 min
4) CST prep – 20 min
5) Homework: Study for Quiz on Friday on
Conservation of Mass, Phase Transitions,
Chemical Reactions, Chemical/Physical Change,
and Endothermic/Exothermic Reactions.
2. 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.
4. 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
5. 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?
6. 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?
7. 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?
8. 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.
9. 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?
10. 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
11. 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?
12. The blue 2 shows there are 2 atoms of
hydrogen in one molecule. And there
are two of the (H2) molecules
13. 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
14. 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.
