Friday, Nov. 16th: “A” DayMonday, Nov. 19th: “B” Day

AgendaCollect Review WorksheetsCollect completed KWLCollect Concept ReviewChapter 3 TestLab Discussion and write-up

We will be in the lab next time…Homework:

Finish popcorn lab write-upWork on mole project – due next time!

Ch. 3 Test“Atoms and Moles”

You may use your notes, the electron filling chart, a period table, a calculator, etc.

You may NOT use your book, homework or any quizzes…

GOOD LUCK!When you’re done with the

test, pick up a lab handout andstart reading it through…

Lab: “Conservation of Mass:

Percentage of Water in Popcorn”For this lab, you may choose your own lab

partner.

Lab: “Conservation of Mass: Percentage of Water in Popcorn”

Make sure to update your table of contents with this lab before starting the lab write-up.

Remember the steps of the lab write-up:1.Title2.Purpose3.Hypothesis4.Materials5.Procedure

Lab: “Conservation of Mass: Percentage of Water in Popcorn”

PurposePopcorn pops when the internal water inside the

kernel gets above 100°C, turns to a gas and rapidly expands.

Different types of popcorn have different amounts of internal water and will pop differently.

The purpose of this lab is to test 3 different types of popcorn to determine the percentage water contained in each.

Lab: “Conservation of Mass: Percentage of Water in Popcorn”

HypothesisWhich type of popcorn (beta, gamma or delta)

do you think has the highest percentage of water?

ORDo you think there will be no difference in the

water content of the three different types of popcorn?

Lab: “Conservation of Mass: Percentage of Water in Popcorn”

MaterialsYou will need to actually pop the popcorn to

determine the percentage of water it contains, so what kind of lab equipment will you need?

What type of container will you use to pop the popcorn?

You will use only one 250 mL beaker for all three samples of popcorn. The beaker will need to be cleaned out after each test because they get pretty nasty!

How will you keep the popcorn from flying out of the container while it’s popping?

If you use foil, be sure to poke holes in the foil to let the steam escape.

What will you use to pick up the hot beaker?Beaker tongs!Should you put the hot beaker on the lab table?No, put it on another piece of wire gauze to cool.

Lab: “Conservation of Mass: Percentage of Water in Popcorn”

Materials

How many kernels should you pop at once?20 kernels of each type of popcorn work best for

each test.You will need to add a dropper of vegetable oil

to the beaker before you pop the popcorn.Remember, when any type of food is brought

into the lab, it becomes a chemical and CAN NOT be eaten! (It will probably be burned anyway!)

Lab: “Conservation of Mass: Percentage of Water in Popcorn”

Materials

Popcorn Lab Write-up

You have the rest of the period to work with your lab partner on the lab write-up:

1.Title2.Purpose3.Hypothesis4.Materials To save time, I typed up 5.Procedure the materials/procedure

so you don’t have to…

Popcorn Lab Data TableThis is the data table that you will complete:

Technique Beta

Technique Gamma

TechniqueDelta

Mass of 20 kernels (g)

Mass of Beaker + oil +20 kernels

(before popping) (g)

Mass of Beaker + oil + 20 kernels

(after popping) (g)

Mass of water in 20 kernels (g)

% water in popcorn

HomeworkFinish popcorn lab write-upFinish mole project – due next time!

Popcorn lab next time: be sure

to wear proper footwear!Good Luck this weekend to

musicians at the IMEA festival in DeKalb!