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Pure Substances and Mixtures

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Ms. Norville

on 18 April 2018

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Transcript of Pure Substances and Mixtures

Pure Substances and Mixtures
Learning Goal
We are learning about pure substances and mixtures.
Hey...Guess what!
Particle Theory of Matter
flub, flub, flub
Today....we get our science on with a little experiment!
Dissolve me!
Why can't you trust particles?
Animal, Plant or Mineral?
Working with a partner, you will search to find 10 random items inside of the classroom. You will then have to ask yourselves "what in the world is this object made of". When you decide, record it on the chart you will be given! When finished, make sure to answer the questions on the back of the sheet!
Does it really matter?
Matter can be found
in three different states.
Matter can also be put into two basic categories!
Pure substances
something that is

of two or more substances
a + b = mixture
Your group has 90 seconds to brainstorm as many mixtures as possible found in our world!
There are also two types of mixtures
Mechanical mixture:
The difference in a substance is obvious to the eye.
Things are added, but the appearance doesn't change.
Pure Substances
are as the name suggests....pure there is nothing added to it.
Does Drake matter too?
So....does Mr. Drake matter?
If so, how?
Is he considered a pure substance or a mixture?
a.k.a the tiny "building blocks" that create matter.
They are smaller than atoms!
Did you know that particles are all around us? And the particles behave differently depending on if they are in a solid, liquid or gas state?
You will find out more when we look into..
coming to a class near you!
Rule #1
All matter is made up of particles
The Particle Theory of Matter
Rule #2
The Particle Theory of Matter
All particles of a pure substance looks the same.
Rule #3
The Particle Theory of Matter
The particles of matter are in
Rule #4
The Particle Theory of Matter
Temperature affects the how fast or slow a particle moves
Rule #5
The Particle Theory of Matter
Particles have forces of attraction between them
Rule #6
The Particle Theory of Matter
There are spaces between particles.
Particles in Solids
"Particles are packed tight like the halls at dismissal"
Particles in liquids
"Liquid particles are little more loose, and the take the shape of the container you choose"
Particles in gas
"Particles are loose like kids at recess, moving all over the place, they don't get rest"
Cold = move slower
hot = move faster
Temperature also plays a role when dealing with changes of states from solid, liquid, or gas.
But first, let us watch a movie (clip)!
Finish lab write up. Due next class.
Because they make up everything!
even these!
Dissolve Me!
Concentration and Solubility
What you need to know:
solute- a substance that dissolves
solvent- substance that the solute dissolves in a.k.a the boss
Water....dissolving stuff
most solids, liquids and gases dissolve into water making it one of the most powerful solvents!
Not everything dissolves in water! What are some things that water has no affect on?
Assignment Time!
Mixture Madness
Concentration and Solubility
When you mix a solute and a solvent you get a solution!
a substance that dissolves
substance that the solvent dissolves in.
Think back when we mixed Borax and the water in the Flubber experiment. Which one was the solvent? Which one was the solute?
Soluble or Insoluble?
something that can be dissolved
something that
be dissolved
Think back to your experiment last class. Which materials were soluble and which were insoluble?
Dissolving....LIKE A BOSS!
a.k.a the boss solvent!
Why might it be called the "Boss Solvent"?
Most substances dissolve in water! However, there are some exceptions!
ability for a one substance (solute) to dissolve into our substance (solvent)
What makes something soluble?
Dilute or Concentration?
small amount of solute particles.
larger amount of solute particles.

When a subtance is extremely concentrated the particles in the solute stops dissolving in the solvent and begins to settle at the bottom of the container. This is known as reaching the
point of saturation.

Sometimes temperature can change the particles and the "point of saturation"
e.g. hot chocolate in cold water vs. hot water
Want to earn some hot chocolate?
Hey You
As a group, come up with a scientific explanation for hot chocolate.
Group with the best explanation wins a cup for each member!
Is it possible to "unmix" a mixture?
Today we will find out! You will work with your groups to learn how to separate solutions and mixtures. You will then present your information to the class in a creative way at the end of the period.
Mechanical Mixture
Pages 228, 243 and 244 in textbook
Coffee Filter Art
“The more mixed up things are, the better the solution”
- Ms. Frizzle
Colors are a combination of different colors, if you take a look at your coffee filter art you will see the beginning of the separation process of the colors in the marker. This is called chromatography.

How might this of happened using the particle theory and knowledge of solvents and solutes?

Put it in your calendars!
Also, start bringing your materials for your experiments! We will be starting soon.
What's The Matter?
1. Get a cup
2. scoop one scoop of ice cream and put it in your cup.
3. Pour half a cup of cream soda in your cup
4. observe what happens when with your experiment
5. Record your observations
Full transcript