9/26/11 62 chemical equations 10/14/2014 61 chemical equations 10/14/2014 starter: application name...
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9/26/1162 Chemical Equations
10/14/2014
61 Chemical Equations
10/14/2014
..
Starter: ApplicationName the reactants in the following equations2Mg + O2 2MgOC + O2 CO2
2H2 + O2 2H2O
Name the products in the following equations2CO + O2 2CO2
N2H4 + O2 N2 + 2H2OC6H12O6 + 6O2 6CO2 + 6H2O
Connection:12 oz of dough, 4 oz mushrooms, 12 slices pepperoni, 8 oz cheese and 5 oz tomato sauce are used to make a pizza. Write a recipe in words for putting together a pizza. How would you write the recipe as an equation?
Exit:Write the equation for hydrogen and oxygen to water and label it Label: reactants, products, coefficients, subscripts, Chemical equation, elements, and compounds.
Practice: Notes: Paste Here
Finish Chemical Formulas from yesterday (15 mins)
Identify the following molecule. Write the chemical formula and how many atoms of each element are in it.
October 14, 2014
AGENDA8.5 E.
I will be able to investigate how
evidence of chemical reactions indicate
that new substances with different
properties are formed by reading, and
writing while completing notes and
activity
1 Starter2. Notes3. Activity 4. Exit
Starter
Identify the following molecule. Write the chemical formula and how many atoms of each element are in it. C6 H12 O6
Glucose
Date Lecture/ Activity/ Lab Page9/25 Metal, Nonmetals, and Metalloids 41-429/26 Where’s Al? 43-449/27 Element Wanted Poster 45-469/30 Bohr Model Challenge 47-4810/1 Periodic Table Notes/Puzzles 49-5010/2 Periodic Table Chart 51-5210/3 Test Review 53-5410/8 Test Corrections 55-5610/9 Molecules, Compounds, and Elements 57-5810/10 Build a Molecule Activity 59-6010/15 Counting Atoms 61-6210/16 Counting Atoms with Coefficients 63-6410/17 Writing Chemical Formulas 65-66 10/18 Physical and Chemical Changes/Properties Notes 67-6810/21 Chemical Equations and the Conservation of Mass 69-70
Table of Contents
Chemical Equations & the Law of Conservation of
Mass
6H2O + 6CO2 C6H12O6+ 6O2
Water + Carbon Dioxide Sugar + Oxygen
Decide whether the following statements are physical changes or chemical changes.
A bicycle left out in the rain begins to rust.Chemical
A match burns, leaving only a charred stick of wood.Chemical
A copper wire is cut into five smaller pieces.Physical
An ice cube melts. Physical
Gasoline burns in a car engine. Chemical
Let’s review physical and chemical changes!
A spoonful of sugar is dissolved in a cup of coffeePhysical
A silver knife and fork tarnish when they are exposed to air for several weeks.Chemical
Leaves of a maple tree turn bright red as winter approaches. Chemical
Water is heated and changed to steam. Physical
Food is digested in your stomach.Chemical
• A chemical equation expresses what happens in a chemical reaction.
• Chemical Equations give us specific information about the substances involved in the reaction.
Law of Conservation of Mass
• Matter cannot be created nor destroyed; only changed.
• The same amount of matter that goes into a reaction comes out of the reaction.
• The chemical equation must be balanced to show that the reactants have the same amount of matter as the products.
• Sometimes a reaction produces a gas, which may be difficult to measure. However, if measured, the mass of the reactants will be equal to the mass of the products.
• Chemical reactions are written as:
Reactants Products
“Original stuff” “Yields” “new stuff”
CH4 + 2O2 CO2+2H2OMethane + oxygen yields carbon dioxide + water
The equation tells us how many atoms and molecules are involved.
2H2 + 2O 2H2O
4 hydrogen atoms
2 oxygen atoms4 hydrogen atoms
2 oxygen atoms
Reactants Products
In order to support the law of conservation, the equation must be balanced:
The number of atoms of each element to the left of the arrow.
Must equal the number of atoms of each element to the right of the arrow.
2H2 + O2 2H2O
H= H=O= O=
2 x 2= 4 2 x 2= 4
2 x 1= 22
The equation is balanced!
The atoms are just
rearranged.
To see if the equation is balanced, just count up the atoms of each element
2Ag + S Ag2S
Ag= Ag=S= S=
2 2
1 1
The equation is
balanced! The atoms
are just rearranged.
• The subscript is the small number to the right of the symbol. It tells you how many atoms are in each molecule. No number means 1.
• The coefficient is the large number in front of the molecule. It tells us how many of each molecule. No number means 1.
H2O
2H2O
• Remember that you can only change the coefficient to balance an equation
__Ag +__ H 2S __Ag2S +__H2
Ag= Ag= H= H= S= S=
1 2
2 2
1 1
2
/ 2
The equation is
balanced!
2H2O
.
9/26/1170 Writing Formula Practice
10/21/2013
69 Writing Formulas Practice
10/21/2013
..
Starter: Application
Name the reactants in the following equations2Mg + O2 2MgOC + O2 CO2
2H2 + O2 2H2OName the products in the following equations2CO + O2 2CO2
N2H4 + O2 N2 + 2H2OC6H12O6 + 6O2 6CO2 + 6H2O
Connection:12 oz of dough, 4 oz mushrooms, 12 slices pepperoni, 8 oz cheese and 5 oz tomato sauce are used to make a pizza. Write a recipe in words for putting together a pizza.
How would you write the recipe as an equation?
Exit:Write the equation for hydrogen and oxygen to water and label it Label: reactants, products, coefficients, subscripts, Chemical equation, elements, and compounds.
Practice: Notes: Paste Here
Identify the following molecule. Write the chemical formula and how many atoms of each element are in it.
III. APPLICATION• Name the reactants in the following
equations• 2Mg + O2 2MgO
• C + O2 CO2
• 2H2 + O2 2H2O
• Name the products in the following equations
• 2CO + O2 2CO2
• N2H4 + O2 N2 + 2H2O
• C6H12O6 + 6O2 6CO2 + 6H2O
LecturePLUS Timberlake 21
IV. CONNECTIONS12 oz of dough, 4 oz mushrooms, 12 slices pepperoni, 8 oz cheese and 5 oz tomato sauce are used to make a pizza. Write a recipe in words for putting together a pizza.
How would you write the recipe as an equation?
.
9/26/1162 Writing Formula Practice
10/14/2014
61 Writing Formulas Practice
10/14/2014
..
Starter: ApplicationName the reactants in the following equations2Mg + O2 2MgOC + O2 CO2
2H2 + O2 2H2O
Name the products in the following equations2CO + O2 2CO2
N2H4 + O2 N2 + 2H2OC6H12O6 + 6O2 6CO2 + 6H2O
Connection:12 oz of dough, 4 oz mushrooms, 12 slices pepperoni, 8 oz cheese and 5 oz tomato sauce are used to make a pizza. Write a recipe in words for putting together a pizza. How would you write the recipe as an equation?
Exit:Write the equation for hydrogen and oxygen to water and label it Label: reactants, products, coefficients, subscripts, Chemical equation, elements, and compounds.
Practice: Notes: Paste Here
Finish Chemical Formulas from yesterday (15 mins)
Identify the following molecule. Write the chemical formula and how many atoms of each element are in it.
V. EXIT
• Write the equation for hydrogen and oxygen to water and label it Label: reactants, products, coefficients, subscripts, Chemical equation, elements, and compounds.
• .
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