CatalystAugust 33 + 3(5)

1. What are the 2 characteristics of a good hypothesis? (Friday’s notes)

2. What word should you use when writing a hypothesis to show that you have a reason for your guess?

3. CHALLENGE SAT QUESTION!!!! (Try it!)CAUSE is to EFFECT as INDEPENDENT VARIABLE is to _____________________.

Write in complete sentences!Don’t talk during the Catalyst!

HW on your desk, please!

Objectives

By the end of today, SWBAT… Dominate variables. Identify lab equipment and describe their use.

Write a quality procedure.

Today’s Agenda

CatalystHW checkVariables BlitzLab Equipment and Quick Safety Breakdown

Procedures + Mystery Goo!Exit Question

HW Check

4.IV = Amount of cigarette use / How many

times a person smokesDV = Chance of developing lunch cancer /

How likely person is to develop lunch cancer

Constants = Type of cigarettes, Health of patients at start of study, Doctor checking for lung cancer, etc.

HW Check

5.IV = Amount of breakfast eatenDV = ACT test scoresConstants = Type of breakfast, Time

breakfast is eaten, ACT test, Location of test, etc.

HW Check

6.IV = Color of sugar waterDV = How fast the water is drunkConstants = Amount of sugar, Amount of

water, Type of food coloring, Size of container, etc.

Doing SCiEnCE!

Question: “What’s going on around me?” Hypothesis: “__________ BECAUSE

__________.” Variables:

IV – Changed by experimenter; CAUSE DV – Changes as a result; Depends on IV;

EFFECT Constant – Stays the same

IV, DV, and Constants

Dr. Brown wants to see if a medicine she invented will improve her patients’ health. So she gives 100 patients her new medicine, and records how long it takes for them to become healthy.

IV = DV = Constants = Type of medicine

Measure of health

Amount of medicine…

IV, DV, and Constants Gavin thinks that water will

evaporate faster in a warm place than a cool one. He puts out two identical bowls of water, one in a warm place and one in a cool place. Then, he times how long it takes the water to evaporate.

IV = DV = Constants = Temperature of location

Time for evaporation

Amount of water…

Chemistry Lab

Chemistry Lab

Beakers

Chemistry Lab

Beaker Tongs

Chemistry Lab

Graduated Cylinder

Chemistry Lab

Erlenmeyer Flask

Chemistry Lab

Flask Tongs

Chemistry Lab

Glass Funnel

Chemistry Lab

Micro Spatula and Scoop Spatula

Chemistry Lab

Stirring Rods

Chemistry Lab

Hand Test Tube Holder

Chemistry Lab

Test Tube Rack and Small Test Tubes

Chemistry Lab

Standard Test Tubes

Chemistry Lab

Test tube brushes

Chemistry Lab

Bunsen Burner

Chemistry Lab

Ring Stand and Clamps

Chemistry Lab

Wire Gauze with Ceramic Center

Chemistry Lab

Triple-Beam Balance

Chemistry Lab

Analytical Balances

Chemistry Lab

Mortar and Pestle

Chemistry Lab

Droppers

Chemistry Lab

Pipets and Pipet bulb

Chemistry Lab

Thermometers

Chemistry Lab

Wash bottle

Safety Equipment

Goggles

Safety Equipment

Apron

Safety Equipment

Gloves

Safety Equipment

Fire extinguisher

Safety Equipment

Safety blanket

Safety Equipment

Eye wash

Safety Equipment

Safety shower

What could happen if we don’t follow safety guidelines?

Wear your safety goggles!

Chemical burn….

Frayed cord?Unattended fire?

HOMEWORK, Pt 1:Safety Contract

ONTOPROCEDUR

ES!

Importance of a Good ProcedureWe must read and follow directions all the time…

JUST THINK ABOUT DRIVING!JUST THINK ABOUT DRIVING!

Importance of a Good Procedure

Key Point #1: Anyone can understand and duplicate a good procedure.

Understand: The procedure is easy to read and has simple language

Duplicate: The procedure can be repeated

When Things Go Wrong…

When Things Go Wrong…

Key Point #2: You must always have a plan while performing an experiment.

This prevents problems It is important to always read ALL

directions and think before beginning an experiment

ANTICIPATION

Words My definitions Ms. S’s

definitions

Now, divide your paper into three sections.

1. Experiment

2. Materials

3. Procedure

Ms. S’s Definitions

Experiment:a test you do to answer a question and test a hypothesis

Ms. S’s Definitions

Materials:the things you need to perform an experiment (including safety equipment)

Ms. S’s Definitions

Procedure:the instructions you need to follow to perform an experiment

How to plan a procedure….

Key Point #3: Characteristics of a quality procedure…

1. Materials (including safety equipment)

2. Step-by-step instructions3. Each step is numbered4. Specific and clear

Is this a quality procedure?

Is this a quality procedure?

Materials:

-Beaker -Water

-Tongs -Red dye

-Syringe -Stirrer

Procedure:

Place the beaker on the lab bench. Pour 25 mL of water into the beaker. Add 5 drops of red dye to the water and stir with the stirrer. Heat the beaker up using a hot plate.

Is this a quality procedure?

Materials:-Funnel-Filter Paper-Glass rod-Erlenmeyer flask-Water/sand mixture Procedure:1. Place the filter paper in the funnel.2. Place the funnel in the Erlenmeyer flask.3. Use the glass rod to help pour the water/sand mixture

into the funnel. 4. Collect the filtrate in the Erlenmeyer flask.5. Clean up.

Mystery Goo

Ms. S stayed after school last night and mixed

corn starch and water together. Afterwards, she noticed that the goo had some strange properties. Sometimes it acted like a liquid,

and sometimes it acted like a solid. She wanted to find out how to make the best

goo possible for her students, so she planned an experiment. Then, Ms. Edwards

told Ms. S she heard a rumor that you all wanted to do labs. Ms. Edwards convinced

Ms. S to let you do the experiment, too!

Mystery Goo

Directions: With your group, select what materials you will use and plan your procedure to make…

…a perfect mixture that is 30 mL of water and 1/4 cup of corn starch.

Don’t forget safety equipment!

***Write it on a separate piece of paper first!***

Available Materials

Corn starch Water Graduated

cylinder Beaker Bowl or cup

Stirring rod Measuring cup Gloves Apron Goggles

Can you think of anything else you might need?

Exit Question

Select the materials and plan the procedure to: (CHOOSE ONE)

Tuesday Exit Questions

Materials: | Procedure:

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make Kool-AidOR

make a sno-ball