demonstrate knowledge of bonding through a quiz. identify the parts of a chemical equation. what is...
TRANSCRIPT
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
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 ChangeReaction
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)
+ F2 (g) + Cl2 (g)
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
Symbols in Chemical Equations
SYMBOL
PURPOSE
(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)
+ 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