gas laws: hands-on discovery

Gas Laws:Hands-on Discovery

Welcome!

Who is CPO Science?

• Developer and publisher of inquiry-based science curriculum and hands-on materials• How many have heard of CPO Science?• Sample materials at your table – PLEASE LEAVE FOR OTHER WORKSHOPS – WE CAN MAIL SAMPLES – Thanks very much!

How is CPO Science Different?• We design and manufacture high quality

science equipment and INCLUDE IT with purchase of textbook sets

• We support guided inquiry through extensive teacher support material and reader-friendly texts

• We offer strong science content that is a blend of conceptual and quantitative approaches.

What Subject Areas?• High School: Physical Science, Earth/Space

Science, Physics First, CP Physics• Middle School: Earth, Life, Physical• Visit the booth• Request samples with raffle forms at end of

workshop

Now for the fun!

Press and hold GO button to turn on the DataCollector

Plug the pressure sensor into Sensor 1 port

Choose Data Collection

Push GO!

Meter View

Press 101.53 (KPA)

Check out table and graph views by clicking on these tabs

Press 101.53 (KPA)

What is a kPa, or kilopascal?

• A pascal (Pa) = 1 N/m2

• 1 kPa = 1000 Pa• Standard atmospheric pressure = 101,325 Pa• Or 101.325 kPa

• What does your pressure sensor read for standard atmospheric pressure?

Make a prediction

• Suppose you connect a syringe to the pressure sensor.

• What would you have to do with the syringe to make the pressure increase? How would you make the pressure decrease?

What would you have to do with the syringe to create this graph?

Time (s)

Pres

sure

(kPa

)

Connect a syringe to the pressure sensor

Create this graph!

Time (s)

Pres

sure

(kPa

)

Design your own experiment

• Boyle’s law states that there is a mathematical relationship between pressure and volume that always equals a constant value.

• The relationship is either:

P ×V or PV

Collect Data

• Find the pressure at these volumes• 10, 12, 16, 18• Graph pressure vs. volume by hand• What is the constant value?

Predict

• Use your data to predict the pressure at 14 mL.• Try it and see how close your prediction was.

Investigate Charles’s Law

Go towww.cposcience.com

For EducatorsWorkshop PowerPoint

PresentationsCharles’ Law

How much can you change the air pressure in an empty plastic bottle by squeezing the bottle with one hand?

Explain, using Boyle’s law, what happens to the balloon inside the bottle when you pull down on the

flexible bottom of the bottle.

What does this model have to do with lungs and breathing?

Predict: Does the pressure in the bottle increase or decrease when you pull down

on the flexible bottom?

What % change in pressure do you expect?

Use your pressure sensor and DataCollector to collect data on how the

bottle pressure changes. Compare the results to your prediction.