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Page 1: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

GASES

Page 2: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

WHAT ARE GASES?

Page 3: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

WHY ARE GASES SO HARD TO STUDY?

Gases are harder to study than other states of matter.

They fly around, they are hard to see, they try to escape.

Scientists made some assumptions.

Let’s say we want to study dogs as a group.What assumptions can we make

Page 4: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

KINETIC MOLECULAR THEORY OF GASES

What assumptions can we make about gases?

http://www.youtube.com/watch?v=93niv-

kijAY

http://www.youtube.com/watch?v=93niv-kijAY
http://www.youtube.com/watch?v=93niv-kijAY
http://www.youtube.com/watch?v=93niv-kijAY
Page 5: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

KINETIC MOLECULAR THEORY

1)Gases consist of really really small particles that are really really far apart.

2) Gases are always moving (in a bumpy way)

3)Don’t experience intermolecular forces. (story of the kid you don’t like)

4)The kinetic energies of gas molecules are directly proportional to their temperature in Kelvin.

5)Gas molecules undergo elastic collisions.

Page 6: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

HOW FAST DO GAS MOLECULES MOVE?

Kinetic energy is proportional to temperature only. What does this mean?

So light objects move faster than heavy objects

Page 7: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

PRESSURE

Pressure- amount of force exerted by the particles

What things can affect the Pressure of a container

Page 8: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

PROUD TO BE A PV=NRT

Any math anybody asks you to do about gases can be done with this equation. You can use it all or just the parts that are changing.

PV = nRT

Page 9: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

http://www.youtube.com/watch?v=JsoE4F2Pb20

http://www.youtube.com/watch?v=Zz95_VvTxZM

http://www.youtube.com/watch?v=JsoE4F2Pb20
http://www.youtube.com/watch?v=JsoE4F2Pb20
http://www.youtube.com/watch?v=JsoE4F2Pb20
http://www.youtube.com/watch?v=Zz95_VvTxZM
http://www.youtube.com/watch?v=Zz95_VvTxZM
Page 10: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,
Page 11: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

WAYS TO TALK ABOUT PRESSURE?

Page 12: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

1 atm = 760 mm Hg = 14.7 psi= 101,325 pascals = 101.3 kPa

Page 13: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

THINGS THAT EFFECT PRESSUREVolumeTemperatureAmount (moles)

Page 14: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

THINGS ABOUT GASES WE LEARN FROM OUR LABS.

Page 15: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

ONE WE WON’T DO IN OUR LABBECAUSE WE AREN’T IDIOTS

Video of someone throwing a spray paint can in the fire.

Page 16: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

A LITTLE MATH

If I compress 1,500 L of nitrogen at an initial pressure of 1 atm until the pressure reraches 450 atm. What will the new volume of gas be?

Page 17: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

A LITTLE HARDER AND A LITTLE LESS HELPI’ve got a balloon. It has 30.0 L of helium gas at 103kPa. I let

it go in the sky and it floats up to where the pressure is only 25.0 kPa. What is my new volume?

Page 18: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

We have a big old can on the stove. It holds 5.00 L I heat it on the stove to 250 degrees C. If I close the lid and let it cool down to 25 degrees C what will be the final volume of the can?

Page 19: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

I blow up a balloon at 24 degrees C. It has a volume of 4.00 L I then take it to a sauna and turn the heat up to 58 degrees C. What will the new volume of the balloon be?

Page 20: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

What else can you do with a PV=nRT?

Solve for any one of the five as long as they give you the other four.

I’ve got a tennis ball filled with Nitrogen gas. It’s 34 degrees C today. The volume of the tennis ball is .148 L and the pressure inside the tennis ball is 212 kPa.

How many moles of Nitrogen are inside my tennis ball?

Could I figure out how many grams of N2 are in my tennis ball? How?

Page 21: GASES. WHAT ARE GASES? WHY ARE GASES SO HARD TO STUDY? Gases are harder to study than other states of matter. They fly around, they are hard to see,

LAST ONE

A deep underground cave contains 2.24 x 106 L of methane gas at a pressure of

1.5 x 103 kPa and a temperature of 315 K. How many kilograms of CH4 are in the cave?


Gases. Properties: Gases are fluids because their molecules/atoms can flow Gases have low density - atoms are far apart from each other Highly compressible

Unit G The Gas Laws. Properties of Gases Gases form homogeneous mixtures Gases are compressible All gases have low densities air 0.0013 g/mL water1.00

Unit 10 Gas Laws. I. Kinetic Theory Particles in an ideal gas… 1.gases are hard, small, spherical particles 2.don’t attract or repel each other. 3.are

PROPERTIES OF GASES Gases are highly compressible

Gases. Kinetic Energy and Temperature Temperature We have to measure temperature of gases in Kelvin Gases below 0°C are still gases and have kinetic

Chapter 20 Gases. Gases are similar to liquids in that both flow and are both considered fluids. The primary difference between liquids and gases is the

The GAS LAWS Gases have mass Gases diffuse Gases expand to fill containers Gases exert pressure Gases are compressible Pressure & temperature are dependent

Chapter 13 Notes – Gases. Gases are different Properties of Gases The volume of a gas is highly variable Gases can be compressed Gases can be very diffuse,

Gases: Their Properties and Behavior Chapter 9. 2 Properties of Gases There are 5 important properties of gases: –Confined gases exerts pressure on the

Gases Chapter 13 Some basics Gases have properties that are very different from solids and liquids. Gases have properties that are very different from

Dissolved Gases. Important Gases 6 important gases are dissolved in lakes, streams, seas 6 important gases are dissolved in lakes, streams, seas Nitrogen

Combined and ideal gas laws Gases Have Mass Gases Diffuse Gases Expand To Fill Containers Gases Exert Pressure Gases Are Compressible Pressure & Temperature

Gases. What do we know? 1.Gases have mass. 2.Gases are easily compressed. 3.Gases uniformly and completely fill their containers. 4.Different gases move

Gases Chapter 20. Gases Gases and liquids are both fluids – they are substances that flow. Because of this, the behavior of gases is very similar to the

A IR Mixture of gases and particulates that are found in the atmosphere Two major gases are Nitrogen (70%) and Oxygen (20%) Most other gases are found

Gases. Ideal Gases Ideal gases are imaginary gases that perfectly fit all of the assumptions of the kinetic molecular theory. Gases consist of tiny particles

interacting classical gases, and interacting quantum gases ... · are classical interactions among gas molecules; in interacting quantum gases, there are both quantum exchange interactions

Specialty and Industrial Gases Welding, Industrial and ... · extremely competitive prices on industrial, specialty, and medical gases as well as related equipment, hard goods, and

KINETIC MOLECULAR THEORY Physical Properties of Gases: Gases have mass Gases are easily compressed Gases completely fill their containers (expandability)

1 MINE GASES. Co2 MINE GASES Measurement Gases are commonly measured in percentage (%) by volume and ppm. Since both of these units of measurement are

Gases. All elements that are gases at standard conditions are nonmetals All compounds that are gases at standard conditions are covalent compounds Gases

Gases Chapter 10 Gases 1. Gases Characteristics of Gases Unlike liquids and solids, they Expand to fill their containers. Are highly compressible

FLUORINATED GREENHOUSE GASES Contents Policies...3. Fluorinated Greenhouse Gases (F Gases) are a family of chemicals that contain fluorine. Most F gases are very powerful greenhouse

1 Chapter 12: Gases and Their Properties. 2 Properties of Gases Gases form homogeneous mixtures Gases are compressible All gases have low densities

Chapter 13 “Gases” What are the properties of gases?

1 CHAPTER 5 GASES. 2 Characteristics of Gases There are three phases for all substances: solid, liquid and gases. Gases are highly compressible

Gases. Gases are defined as having no definite volume and no definite shape. Some properties of gases are 1. They expand to fill their containers

Gases are easily compressed Gases can expand Large amount of space between particles

Noble gases. 1) The noble gases are highlighted - what group are they in?

Properties Of Gases Chapter 5. Nature Of gases 11 elements are gases under normal conditions. The six noble gases are monoatomic. Other gases are diatomic

Chapter 5 Gases. Air Pressure & Shallow Wells Gases Are mostly empty space Occupy containers uniformly and completely The densities of gases are much

Ch. 10 Gases. Characteristics of Gases b Gases expand to fill any container. random motion, no attraction b Gases are fluids (like liquids). no attraction

What are Characteristics of a GAS? Gases have no mass. Gases have no volume. Gases do not interact – elastic collisions. Gases have mass. Gases have

States of Matter Review - School District of GraftonGases fill their container completely. Gases can be compressed. Gases have mass. Properties of Gases Gases are fluids. Gases have

GASES. GASES AND PRESSURE Why are gases so unique?