do now: explain this joke.. let’s make some visual models with m&m’s you will be able to…...
TRANSCRIPT
Do Now:Explain this joke.
Let’s make some visual models with M&M’s
You will be able to…8.5(D) recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts;8.5(F) recognize whether a chemical equation containing coefficients is balanced or not and how that relates to the law of conservation of mass.
KeyRed-Chlorine
Orange-Sodium
Yellow-OxygenGreen-Hydrogen
Blue- Carbon
H2O
Review: How to make a molecule…
No Subscript, There is only 1 atom of oxygen in the molecule
Subscript
Visual modelFormula
H2O
Review: How to make a molecule…
No Subscript, There is only 1 atom of oxygen in the molecule
Subscript
Visual modelFormula
H2O2
6 H2O
Review: How to make a molecule…Visual modelFormula
Coefficient- How many molecules you have.
H2O
1 molecule of H2O
3 H2O
3 molecules of H2O
Let’s make some visual models with M&M’s
You will be able to…8.5(D) recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts;8.5(F) recognize whether a chemical equation containing coefficients is balanced or not and how that relates to the law of conservation of mass.
KeyRed-Chlorine
Orange-Sodium
Yellow-OxygenGreen-Hydrogen
Blue- Carbon
Let’s now model another chemical equation with our M&M’s…
Reactants products
Chemical equation
C + O2 CO2
Visual model
+
Word equation
To yield
Number of atoms
1 atom carbon react with 1 molecule oxygen 1 molecule CO2
1 carbon 2 oxygen 1 carbon 2 oxygen
Is it a balanced equation? How do we know?
Reactants products
Chemical equation
C + O2 CO2
Visual model
+
Word equation
Number of atoms
1 atom carbon + 1 molecule oxygen 1 molecule CO2
1 carbon 2 oxygen 1 carbon 2 oxygen
Law of Conservation of Mass
Matter is not created or destroyed, it just changes forms.In a chemical reaction…
Evidence of a chemical reaction: (chemical change)
• Production of a gas (bubbling, fizzing or foaming)• A change in temperature or light (an energy change)• Appearance of a precipitate (solid material)• A change in color
More practice…
Reactants products
Chemical equation
2C + 2O2 3CO2
Visual model
+
Word equation
To yield
Number of atoms
2 atoms carbon react with 2 molecule oxygen
3 molecules CO2
Is it balanced?
2 carbons 4 oxygen 3 carbons 6 oxygens
With a partner…
Instructions:1. Create visual models for the rest of the chemical
equations.2. Draw an label the visual models.
3. For each equation complete the following stem:
The equation is/is not balanced because…
Chlorine
Sodium
Oxygen
Hydrogen
Carbon
Color Key
The model above is best represented by:a. H2O
b. 2OHc. HOOHd. H2O2
The above model shows:a. 10 atomsb. 2 moleculesc. 2CH3Cl
d. All of the above
6CO2+ 6H20+ Sun’s light C6H12O6+6O2
The above reaction…a. is photosynthesisb. Is respirationc. Transforms radiant energy into chemical
energyd. Both a and c.
Organic Molecules all contain…
a. Sulfurb. Carbonc. Oxygend. nitrogen
All of the following are organic molecules except…
a. C6H12O6
b. CH4
c. C6H6O
d. H20
Yesterday we…
investigated how evidence of chemical reactions indicates that new substances with different properties are formed.
Evidence of a chemical reaction: (chemical change)
• Production of a gas (bubbling, fizzing or foaming)• A change in temperature or light (an energy change)• Appearance of a precipitate (solid material)• A change in color
A chemical equation tells the story of a chemical reaction. Our combustion reaction again…
Reactants products
Physical properties
White crystal To yield
Black crystal/powderGas produced
Chemical equation
C12H22O11 + 12 O2 12 CO2 + 11 H2O
Visual model
+
+
Number of atoms 12 atoms carbon+ 22 atoms hydrogen+ 35
oxygen atoms
12 atoms carbon+ 22 atoms hydrogen+ 35
oxygen atoms
Chemical Reaction Dehydration of sugar…
Reactants products
Physical properties
White crystal To yield
Black crystal/powder and white gas
Chemical equation
C12H22O11 12 C + 11 H2O (vapor)
Visual model
+
Number of atoms 12 carbons 22 Hydrogen 11 oxygen
12 carbons 22 hydrogens 11 oxygens
Chemistry Practice with Qwizdom Remotes
Please wait until your teacher asks you to log in with your student id.