catalyst august 3 3 + 3(5)
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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
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