Welcome Back! Homework: Read page and Define each bolded term and give an example sentence of each bolded term ( Use Cornell Notes style) Do Now: Write Down Homework Take out your Science notebooks and update TOC pg. 52 Intro: to Gases and page 53- Gas Measurements Homework Open your notebooks to page 52 Open your textbooks to page 55 Today I will…. Explore the ways gases behave

TONIGHT’S HOMEWORK- What measurements are used in studying gases and how are they important?? (This is the main question you will be answering in your notes) The three you will be reading about tonight are: Volume, Temperature and Pressure

What do we know about gases and how they behave? Take a few minutes: With the people around you discuss and make a list (T-Chart) in your notebook on page 52 about what you already know about gases… Then add something you want to learn or know more about gases and how they behave… What we Know What we want to know/learn

WHAT WOULD HAPPEN IF THERE WAS TOO MUCH AIR INSIDE THE BALLOON? It will Burst! What causes the balloon to inflate? The air (which is a mixture of gases, is pushing on the sides of the balloon, but the balloon is also pushing back on the particles

WORDS THAT DESCRIBE THE BEHAVIOR OF GASES New Vocabulary terms you see in the reading: Contract: Expand: Compress: Inflate: In groups of 3-4: Define and discuss the meaning of each of these words: Write down ideas in your notebook on page 52. -Then each take a turn demonstrating the meaning of each word with balloon: -Draw a picture of what each looked like next to your definition of each. -Then write an antonym for each of the four words.

WORDS THAT DESCRIBE THE BEHAVIOR OF GASES New Vocabulary terms you see in the reading: Contract: To reduce in size by drawing together; shrink Expand: To increase the size, volume, quantity, or scope of; enlarge Compress: To press together, make more compact Inflate: To fill (something) with air or gas so as to make it swell

JANUARY 6, 2014 Homework: Write Cornell notes summary on pg. 55 in notebook Do Now: : Take out Homework from (Thursday) Write down tonight's Homework: Update TOC: pg.: 54/55 Cornell notes summary in NB: pg. 55/56 Pressure, Temperature, Volume notes Open Textbooks to pg. 56

WHAT ARE THE PROPERTIES OF GASES? No definite shape No definite volume Gases easily contract or expand

WHAT ARE THE MEASUREMENTS USED TO HELP DETERMINE THESE PROPERTIES? Volume Temperature Pressure

VOLUME: WHAT IS VOLUME? Definition: The amount of space that matter fills The volume of a gas is the same as the volume of its container Measured in cubic centimeters,(cm 3 ), milliliters (mL), liters (L), and other units

TEMPERATURE (Measured in degrees Celsius (C) or Kelvin (k)) Definition: The measure of the random motion of the particles in matter The faster the particles are moving, the greater the energy and the higher the temperature “Think of a thermometer as a speedometer for molecules.”

PRESSURE: Pascal's (Pa) or kilopascals (kPa) Definition: Pressure of a gas is the force of its outward push divided by the area of the walls of the container. Pressure = Force/Area

WRITE THIS QUESTION BELOW ON PAGE 56 IN NOTEBOOK: What conditions can affect the volume of a gas?

VOLUME:

HELIUM IN THE TANK VS. HELIUM IN THE BALLOONS Look at Figure 14 on page 56: How is the Helium in the tank different from the helium in the balloons? The helium in the tank is at a higher pressure and takes up a small space ( occupies a smaller volume) at higher pressure the helium is compressed.

ANSWER QUESTION BELOW ON PAGE 55/56 IN NOTEBOOK: What conditions can affect the volume of a gas? The temperature and pressure of a gas and the volume of the container it is in.

r1/lesson5 r1/lesson5

How does gas exert pressure? The gas particles collide with one another and the walls of their container Ex: the balloon inflating The firmness of a gas filled object comes from the pressure of a gas. Higher pressure means a greater concentration of gas particles in a container then in the area surrounding the container.

GAS PRESSURE IS CAUSED BY GAS PARTICLES PUSHING ON THE WALLS OF A CONTAINER Is the air pressure higher inside or outside the balloon? Inside— Why?

WHY DID THE BALLOON DEFLATE?

ANSWER IN NOTEBOOK ON PG 56: As “temperature,” increased, how did the pressure applied by the, “gas particles,” change? The pressure increased—gas particles hit the sides of the box more often