Warm up (3 minutes) 1. Pick up a warm up

2. Pick up the student work from the front table

3. Pick up your binder in the filing cabinet

4. Complete the warm up

5. Secure all handouts in your binder

1. What words or ideas come to mind when you hear scientific method? List at least three of these things on your paper.

2. In your own words, what is a chemical reaction?

Make sure that your clothes and hair are appropriate for lab. Place bags and sweaters under your desk so that your table top and the aisles are clear!

This stopwatch is timing how long it takes you to get ready. It will stop after everyone

- has completed a warm up - has their binder in front of them - has today’s work - is sitting in their assigned seat - has given 3 seconds of silence.

Your class will gain points based on how quickly this happens.

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Topic 1.5.1

Alka Seltzer Lab, p. 11

Today’s Plan:

1. Warm Up (3 min)

2. Scientific Method Review (15

min)

3. Alka Seltzer Lab (40 min)

4. Exit Slip (5 min)

Today’s Objective:

Design and implement an

experiment using the SM and

practice completing the

components of a lab report.

FOCUS QUESTION: How can I use the

scientific method to answer a question?

Alka Seltzer Lab

In today’s lab, you will be using the scientific method to answer a question about the chemical reaction rate of Alka Seltzer.

Introduction and Note-Taking

Alka Seltzer is a medicine in a tablet form that can help with upset stomach and other every day ailments. For today’s lab it will serve as a terrific example of two important properties of chemical reactions:

– surface area

– temperature.

Introduction and Note-Taking

• Chemical Reaction: A process that changes or transforms one set of chemicals into another set of chemicals

– Photosynthesis or cellular respiration are examples of chemical reactions

• Surface area: The total area of the surface of a three-dimensional object

Surface Area

Introduction and Note-Taking

When Alka Seltzer is placed in water, it starts a chemical reaction where the tablet reacts with water and releases carbon dioxide bubbles. You will measure the reaction rate.

Introduction and Note-Taking

• Rate: A ratio of two measurements having different units.

Example: Miles per hour is a rate that measures how much distance you travel (miles) in a certain amount of time (hours).

For today, you will measure how long (time) it takes for the chemical reaction to be completed (absence of bubbling).

Introduction and Note-Taking

Questions for Today’s Lab

1. How does the surface area of an object affect the rate of a chemical reaction?

2. How does temperature affect the rate of a chemical reaction?

You need to choose one of these to test today.

Guidelines

• Make sure that you include and follow all steps of the Scientific Method and be clear and specific in your design! A template has been provided for you to follow.

• Use lab equipment with respect and care! Remember your Lab Safety Contract!

Design Your Own Experiment! Possible Materials • Alka Seltzer tablets • Room temperature

water • Hot water • Ice • Mortar and pestle,

spoon or other crushing device

• Thermometer • Beakers • Stopwatch

• Make sure a teacher looks over your Experimental Design before gathering materials!

• BE SPECIFIC! Another person should be able to read your design and reproduce the experiment.

• Be Creative!

Lab Clean Up! • Clear your desk of all supplies and return

them to the front of the room • Return to your seat ready for the Exit Slip

This stopwatch is timing how long it takes you to

get ready. It will stop after everyone

-- is sitting in their assigned seat

- has given 3 seconds of silence.

Your class will gain points based on how

quickly this happens.

Living Environment: Nature’s Sustainable Design

• TODAY IS THE LAST DAY TO HAND IN LAB SAFETY CONTRACTS FOR A PASSING GRADE!

• Unit 1.3.1 Homework is due TOMORROW (Friday, 9/12)!

16

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Announcements

Fill in your homework due dates in your Unit 1 Packet!

Sept. 8

Sept. 12

Exit Slip (5 minutes) 1. Return to your assigned seat

2. Complete the exit slip

3. Clean up your workstation

4. Secure all handouts in your binder

5. Put your binder away.

1. Which question did you choose to test?

2. Using data from your experiment, what conclusion did you come to about the hypothesis of your experiment?