CATALYST• Objectives: • I can convert

between Celsius and Kelvin temperature scales.

• I can explain what absolute zero is.

• Agenda: • Catalyst• Notes & Practice:

Gases and temperature

• Thermometers Reading Activity

• Exit Slip: Temperature

On your handout, draw and describe the solid, liquid, and gas shown here

OBJECTIVES:

I can convert between Celsius and Kelvin temperature scales.

I can explain that there is no temperature lower than 0 degrees Kelvin (absolute zero).

THINK PAIR SHARE

30 sec to think, then talk with the person next to you… be ready to share with the class:

1. Our new unit is gases. What is a gas?

2. How are gases similar or different from liquids or solids?

GASES NOTES 1: INTRODUCTION AND VOCABULARY

Characteristics of Gases1.The distance between gas particles is

much greater than the distance between particles of a liquid or solid.

2.Applying pressure to a gas compresses or pushes the particles closer together.

3.Unlike solids and liquids, gases completely fill their containers.

4.Gases have high kinetic energy because their particles move more than particles in a solid or liquid.

5.Gases do have mass. (We measured the mass of carbon dioxide in the baking soda/vinegar lab.)

HOW DO WE MEASURE GAS PROPERTIES? kinetic energy: the energy of an object that

is due to the object’s motion. Energy of motion

• temperature: a measure of the average kinetic energy of the particles in an object.

• How much kinetic energy the molecules have

HOW DO WE MEASURE GAS PROPERTIES?

volume: a measure of the size of an object in three dimensional space. How much space the

molecules are filling up pressure: the amount of

force exerted per unit area on a surface. How much the

molecules are pushing on a surface

TODAY’S FOCUS: TEMPERATURE

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Kelvin Celsius

Abbreviation: KExample: 100K

Abbreviation: ° C Example: 98° C

Zero degrees Kelvin is called absolute zero. Absolute zero is the temperature at which all molecular motion stops.

Absolute zero is -273° C .

273K is the freezing point of water

0° C is the freezing point of water

373K is the boiling point of water 100° C is the boiling point of water

There are no negative Kelvin temperatures.

Most of the world uses the Celsius scale on an everyday basis.

In chemistry we use two temperature scales: Celsius and Kelvin

CELSIUS & KELVIN CONVERSIONS The formula

K = oC + 273

Example: convert 33oC to Kelvin: K = 33oC + 273 = 306K

Example: convert 202K to Celsius:202K = oC + 273202K - 273 = -71 oC

Convert these temperatures to Kelvin 23oC 100oC -173oC

Convert these temperatures to Celsius 0K 123K 300K

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CELSIUS & KELVIN CONVERSIONSK = oC + 273

Convert these temperatures to Kelvin 23oC 100oC -173oC

Convert these temperatures to Celsius 0K 123K 300K

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PRACTICE:

Complete the practice problems at the bottom of your notes.

Get a stamp when you are done.

READING ACTIVITY

Reading Activity: Thermometers Article Read the article about thermometers and

answer the reading focus questions on your own sheet of paper. (Standards 4e, 4f, and writing)

You may work quietly with a partner.

When you are done, check the answer key and try the extra practice problems on your worksheet.

HOMEWORK

Bring a 2 Liter bottle!!!

HOMEWORK If you did not finish the article questions,

it is due tomorrow. The article is posted on the class website.

Read Textbook pp. 43-45 Do problems pp. 45 #6, 7, 8, 12. (Videos and other resources posted on class website.)

Optional: Make Flashcards: temperature, pressure, volume, kinetic energy, celsius, Kelvin, absolute zero, solid, liquid, gas

EXIT SLIP ANSWERS (STANDARD 4E & 4F)1. What is temperature?

Temperature is a measure of the average kinetic energy of particles in an object.

2. Are there negative Kelvin temperatures? Why or why not? There are no negative Kelvin temperatures because 0K is

absolute zero. That is the lowest possible temperature because it is the temperature at which all molecular motion stops.

3. Convert the following: 0oC = _____K 273K 1500oC = ____K 1773K 1200K = _____ oC 927oC 100K = _____ oC --- - 173oC