Demonstrate knowledge of bonding through a quiz. Identify the parts of a chemical equation. What is...
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![Page 1: Demonstrate knowledge of bonding through a quiz. Identify the parts of a chemical equation. What is the difference between a physical and a chemical change?](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea85503460f94bab750/html5/thumbnails/1.jpg)
CATALYST
• Demonstrate knowledge of bonding through a quiz.
• Identify the parts of a chemical equation.
What is the difference between
a physical and a chemical change?
OBJECTIVES
DATE: 02/25/2015
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REMINDERS
• Chemical Equation Practice–Page 284 #1-3
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Engineering Week
• Monday: Electronic Breakdown• Tuesday: Egg Drop Challenge• Wednesday: Build a Lightbulb
(Resume Workshop)• Thursday: Fling Machine• Friday: Light Soldering
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Physical Change
• Changes to a substance that do not result in new types of molecules.• The chemical formula remains
the same.
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• Changes in a substance that involve atoms rearranging to form new molecules.• There is a change in the chemical
formulas!
Chemical ChangeReaction
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How can you tell if a chemical reaction is occurring?
• Gas formation
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How can you tell if a chemical reaction is occurring?
• Precipitate (solid)
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How can you tell if a chemical reaction is occurring?
• Color Change
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Chemical Equations
• A model to represent what is happening during a chemical reaction.
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Chemical Equations
2 NaCl (s)
2 NaF (s)
+ F2 (g) + Cl2 (g)
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Symbols in Chemical EquationsSYMBOL
PURPOSE
+ Separates more than one reactant or product
Separates reactants
from products. Indicates direction of reaction
(s) Identifies a solid state
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Symbols in Chemical Equations
SYMBOL
PURPOSE
(aq)Identifies that
something is dissolved in water
(l) Identifies liquid state
(g)Identifies gaseous
state
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Write the word equation for the following chemical equation.
2 NaCl (s)
2 NaF (s)
+ F2 (g) + Cl2 (g)
2 molecules of solid sodium chloridereact with
1 molecule of fluorine gasto yield
2 molecules of solid sodium fluorideand
1 molecule of chlorine gas