Pressure Review II

🧪 INSTRUCTIONS:
1st Study and Take Notes on the material below
2nd After taking notes, complete the Review Questions.
3rd Refer to Textbook pages 207-209 for Reference
4th Screenshot your name + score to the Google Classroom when finish

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PRESSURE & UNIT CONVERSIONS — CAST CHEMISTRY PREP

Students: interact → take notes in your Science Notebook → complete the quiz → upload a screenshot of your final score.

Save Notes Clear Notes Jump to Quiz

PART A — VOCAB (TAP TO REVEAL)

Tap each card. In your notebook, write: Term + definition + a quick example (like “tire pressure”).

PART B — WHY PRESSURE CHANGES

Collision Model Simulator (Qualitative)

Pressure Level: MEDIUM

Adjust sliders to see how collisions affect pressure.

Temperature50

Higher T → faster particles → more forceful collisions.

Volume (space)50

Smaller V → particles hit walls more often.

# of Particles50

More particles → more collisions → higher pressure.

“Collision Rate”--

collisions ∝ (T × n) / V

This is a simplified model for learning (not a real formula).

Notebook Checkpoint (write these 3 “If…then…” rules)

1. If temperature increases (volume constant), then pressure _____ because particles move _____.
2. If volume decreases (temperature constant), then pressure _____ because collisions happen _____.
3. If # of particles increases (volume constant), then pressure _____ because there are _____ collisions.

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Quick CAST Prompt

Why does tire pressure drop when it gets cold? (Use collisions + temperature language.)

Tip: Use the words average kinetic energy, slower, and less forceful collisions.

PART C — UNITS OF PRESSURE (MEMORIZE THESE)

Standard pressure

1 atm = 101,325 Pa = 101.325 kPa

1 atm = 760 mm Hg = 760 torr

1 atm = 14.7 psi

CAST likes: pick the right unit, compare values, and explain what changes pressure.

What a barometer does

A mercury barometer measures atmospheric pressure by the height of a mercury column.

At sea level, the mercury column can be about 760 mm high.

Key names: Evangelista Torricelli (17th century).

Altitude idea

Atmospheric pressure is caused by the weight of air.

Higher altitude → less air above you → lower pressure.

Be ready to compare “sea level” vs “mountain top.”

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Interactive Unit Converter (with dimensional analysis)

Value

From kPa Pa atm mm Hg torr psi

To atm kPa Pa mm Hg torr psi

Convert Swap

Result will appear here.

Dimensional analysis line will appear here.

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Notebook Notes (copy these headings)

• Pressure = collisions with container walls
• Standard pressure conversions (1 atm equivalents)
• How to convert: multiply by a conversion factor so units cancel

Calculator (for conversions)

Use it for multiplication/division and rounding to correct sig figs.

PART D — QUIZ (10 QUESTIONS)

Directions: You must complete the quiz after taking notes. Your quiz pulls 10 random questions from a bank of 20.

First name

Student number

Begin Quiz

Score appears only after Q10.

 

Question text.

Number answer (decimals allowed)

Round when the question tells you to.

Submit

Assignment Complete

Student:  

Score ID:

Screenshot this score screen and upload it to Google Classroom.

Try a new 10-question set

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Click here for Screenshot

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