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?

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Presentation transcript:

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? 02/25/2015

REMINDERS Chemical Equation Practice – Page 284 #1-3

Engineering Week Monday: Electronic Breakdown Tuesday: Egg Drop Challenge Wednesday: Build a Lightbulb (Resume Workshop) Thursday: Fling Machine Friday: Light Soldering

Physical Change Changes to a substance that do not result in new types of molecules. The chemical formula remains the same.

Changes in a substance that involve atoms rearranging to form new molecules. There is a change in the chemical formulas! Chemical Change Reaction

How can you tell if a chemical reaction is occurring? Gas formation

How can you tell if a chemical reaction is occurring? Precipitate (solid)

How can you tell if a chemical reaction is occurring? Color Change

Chemical Equations A model to represent what is happening during a chemical reaction.

Chemical Equations 2 NaCl (s)2 NaF (s) + F 2 (g)  + Cl 2 (g)

Symbols in Chemical Equations SYMBOLPURPOSE + Separates more than one reactant or product  Separates reactants from products. Indicates direction of reaction (s) Identifies a solid state

Symbols in Chemical Equations SYMBOLPURPOSE (aq) Identifies that something is dissolved in water (l)Identifies liquid state (g)Identifies gaseous state

Write the word equation for the following chemical equation. 2 NaCl (s)2 NaF (s) + F 2 (g)  + Cl 2 (g) 2 molecules of solid sodium chloride react with 1 molecule of fluorine gas to yield 2 molecules of solid sodium fluoride and 1 molecule of chlorine gas