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Physical Science Review Part 2

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Physical Science Review Part 2 Mixtures and Solutions – PowerPoint PPT presentation

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Title: Physical Science Review Part 2


1
Physical Science Review Part 2
  • Mixtures and Solutions

2
What is a mixture?
  • Mixtures are absolutely everywhere you look.
    Mixtures are the form for most things in nature.
    Rocks, air, or the ocean, they are just about
    anything you find. They are substances held
    together by physical forces, not chemical. That
    statement means the individual molecules enjoy
    being near each other, but their fundamental
    chemical structure does not change when they
    enter the mixture.

3
Mixtures are everywhere!
  • There are an infinite number of mixtures.
    Anything you can combine is a mixture. Think of
    everything you eat. Just think about how many
    cakes there are. Each of those cakes is made up
    of a different mixture of ingredients.

4
Mixtures are everywhere!
  • If you put sand into a glass of water, it is
    considered to be a mixture. You can always tell a
    mixture because each of the substances can be
    separated from the group in different physical
    ways. You can always get the sand out of the
    water by filtering the water away.
  • Click on the link below to try your hand at the
    Mixtures Lab.
  • http//www.harcourtschool.com/activity/mixture/mix
    ture.html

5
Solutions
  • Solutions are groups of molecules that are mixed
    up in a completely even distribution.
  • Solutions have an even concentration throughout
    the system. An example Sugar in water vs. Sand
    in water. Sugar dissolves and is spread
    throughout the glass of water. The sand sinks to
    the bottom. The sugar-water could be considered a
    solution. The sand-water is a mixture.

6
Can Anything Be In Solution?
  • Pretty much. Solutions can be solids dissolved in
    liquids. They could also be gases dissolved in
    liquids (such as carbonated water). There can
    also be gases in other gases and liquids in
    liquids. If you mix things up and they stay at an
    even distribution, it is a solution.

7
Solute vs. Solvent
  • A simple solution is basically two substances
    that are going to be combined. One of them is
    called the solute. A solute is the substance to
    be dissolved (sugar). The other is a solvent. The
    solvent is the one doing the dissolving (water).

8
Activity Use the following recipe for Blueberry
Pancakes and see if you can identify the mixtures
and solutions,
  • Directions
  • In a large bowl, sift together the flour, sugar,
    baking powder, and salt. Set the bowl aside.
  • Melt the margarine in a small saucepan.
  • Crack the egg into a medium-size bowl, then add
    the milk and melted margarine.
  • Whisk egg mixture until it is well mixed.
  • Add the flour mixture to the egg mixture. Whisk
    again until both mixtures are blended together.
  • Put extra margarine in the saucepan and heat it
    on the stovetop on medium heat. It is hot enough
    when the margarine starts to bubble.
  • Use a measuring cup or a small ladle to spoon the
    batter into the pan. Put some blueberries on top
    of each pancake.
  • Cook your pancakes on medium heat until small
    bubbles appear on the top.
  • Use a spatula to see when your pancakes are light
    brown on the bottom. When they are, flip them
    over with the spatula.
  • Cook for another few minutes until the pancakes
    are light brown on the other side.
  • Remove your pancakes and put them on plates to
    enjoy!
  • Ingredients
  • ¾ c. flour
  • 1 tbsp. sugar
  • 1 tsp. baking powder
  • ½ tsp. salt
  • 1 tbsp. margarine
  • 1 egg
  • ¾ c. milk
  • ½ c. blueberries, washed and drained
  • extra margarine for the pan

Use colored pencils and mark on the recipe where
there is a mixture and where there is a solution.
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