chemistry 3b -...
TRANSCRIPT
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Chemistry 3B
Objectives
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Physical vs Chemical Change
• StudyJams
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Physical Change
• The appearance of a substance may have changed, but the bonds holding the atoms together have not been broken and no new bonds have been made.
• Ex: Chocolate left in the sun
• Ex: Ice turning to liquid water
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Physical Change Examples
• Change of state (melting, evaporation, condensation, freezing)
• Dissolving
• Cutting
***Process is Reversible
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Chemical Change
• Produces new substances with new properties, which may or may not be noticeable.
• New bonds are formed while other bonds are broken.
• Elements are conserved during chemical change but compounds are not.
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Reactants & Products
• Reactants - are the substances you start with that are going to react with each other.
• Product - is the new substances produced
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Law of Conservation of Mass
• In a chemical reaction, the mass of the reactants is equal to the mass of the product.
Hydrogen + Oxygen -> Water
20g + 10g 30g
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Are Atoms created or destroyed in a chemical reaction?
No
There are the same number of each type of atom on the reactant side as there are on the product side of the chemical equation.
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Determine the number of Atoms on the reactant and product sides
Chemical equation for water
2H2 + O2 -> 2H2O
Reactant side: 4 hydrogen, 2 Oxygen. Product side: 4 hydrogen, 2 oxygen
x x
x
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Determine the number of carbon, hydrogen, and oxygen’s on the
reactant and product side.
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• CH4 + 2O2 CO2 + 2H2O
• Product side: 1 carbon, 4 Hydrogen, 4 Oxygen
• Reactant side: 1 carbon, 4 hydrogen, 4 oxygen
x x
x
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• The atoms in the products come from the atoms in the reactants. In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.
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Evidence of a Chemical Change
• Color change
• Heat is produced or absorbed
• Gas is produced (Bubbles form)
• A precipitate forms
***Process is difficult to reverse
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Precipitate
is the creation of a solid in a solution or inside another solid during a chemical reaction. The solid formed is called the 'precipitate'.
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Worksheet
• Physical vs Chemical Changes
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Bill Nye “ Chemical Reactions”
https://www.youtube.com/watch?v=Rtcf6Pjahec
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Chemical Change Examples
1. Combustion (burning) – involves a substance combining with oxygen coupled with the release of energy.
Ex: liquid hydrogen fuel reacting with liquid oxygen within the shuttles rockets.
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2. Corrosion – process by which metals combine with oxygen (oxidation).
Ex: NL Ferries undergo a rusting process when the iron reacts with the oxygenated water.
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What may speed up the rusting process for the NL ferries?
What could be done to help protect the ship from corroding?
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Textbook Page 90
• Parliament buildings roofs in Ottawa? Explain the color change.
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Fruit Ripening Textbook Page 89
• Explain why one bad apple in a bag of apples should be removed immediately?
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STSE
• Plastics & Modern Life
• Video’s
• Plastic Chart
• Article
• Plastic Milk Lab
• Video: Ocean of plastics
• Recycling Plastics (worksheet at this address) http://recycle-bowl.org/wp-content/uploads/15-Plastics-by-the-Numbers-numberless-done.pdf