Grab binders & handoutsBegin the Do Now

10/1 Do Now• Describe the temperature as a substance goes

through a phase change

• What is temperature a measurement of?

• What units for temperature did we use during the phase change lab?

Recap- Defining Temperature

- Relationship between T, KE, and particle motion

- Explaining what occurs at the particle level as substance goes through phase changes

SystemsWhat is the difference between the following 2 images?

Open Systems: exposed to environment, uncontrollable Closed Systems: closed off, controllable

Open or closed?In your notebook, label each image (A-D) as either open or closed.

A.

D.

B.

C.

Standard Pressure & Temperature:Key Point #1

Key Point 1: - Kelvin (K) = temperature scale used in chemistry

Add this to your Scientific Measurement Tracker!- Measurement = Temperature- Unit of Measurement = Kelvin- Symbol = K- Measurement Tool = Thermometer- Mathematical Formula= °C + 273

Key Point #2Key Point 5:

- Celsius to Kelvin conversion =

Kelvin = °C + 273Celsius = K - 273

Steps to Convert between °C & K1. Identify what temperature is GIVEN

2. Identify UNKNOWN temperature units

3. Set up the EQUATION 4. SOLVE for the unknown using the right formula

5. SEE that units are properly labeled

Converting between °C & KExamples:

1. Convert 25°C to Kelvin

2. Convert 375K to degrees Celsius

Converting between °C & KQuick Practice:

1. Convert 98°C to Kelvin2. Convert 567K to degrees Celsius3. Convert 0°C to Kelvin4. Convert 274K to °C5. Convert 98K to °C

Key Point #3Key Point 3:

- Standard Temperature= 273K (or 0˚C)

What is standard pressure? How would you define pressure?

Would you rather be stepped on with a heel or with a sneaker?

Standard Pressure & Temperature

PressureDirections: For the following pictures, record where pressure is being experienced.

A. B.

C.

D.

Key Point #4Key Point 4:

- Pressure = Force applied over an area

- Pressure = caused by particles hitting the walls of their container

- Standard Pressure = 1 atmospheres (atm)

Add this to your Scientific Measurement Tracker!

Key Point #5Key Point 5:

P = F/AA. Force = 10N; Area = 2m2

B. A force of 264N is applied over and area of 2m2, what is the pressure?

Practice

A. Pressure = 500 N/m2; A = 3m2

B. A pressure of 6N/m2 is felt when a force of 24N is applied. What area was the force applied over?

P = F/A

Exit Ticket #6Complete Exit Ticket 6 to the best of your

abilities on your own & without notes.

DON’T FORGET to LABEL UNITS!