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The Mole Balancing Equations Mass Composition Types of Reactions Stoichiometry Stoichiometry: Limiting Reagents
The Mole
Watch Khan Academy chemistry mole and Avogadro's number video.
Draw, name and calculate the grams/mole for 10 common molecules you see above.
For Example: CO2 (carbon dioxide has 1C and 2 O)
the total grams for C = 12g plus total grams for 2 O = 2 * 16g
12g + 32g = 44g/1mol CO2
Balancing equations
Watch Khan Academy Balancing Chemical Equations.
Then finish and submit your results to the practice questions in the beginning of class.
Make your own chemicals in a chemical reaction (use the color codes).
If you make your models on paper, be sure the chemicals are inseparable. If you use model kits, you can use a balance scale to double check that mass is conserved.
Balancing Activity
1. Choose a molecule that you can name and make a model of. Then, determine the other chemicals needed for a complete reaction for this molecule.
2. Make all the molecule models in your reaction.
3. Determine the number of each chemical you will need to write the final balanced equation.
4. Try this Balancing Equations Quiz
also classzone.com
Example : Make CO2 with 1black C glued in between two red O's.
Carbon dioxide is a product made from burning methane in the presence of oxygen gas. Another by product is made of water.
methane is CH4 oxygen gas O2 and water H2O
To be balanced, add another water (for 2 more H's)
Then add another oxygen gas (O2 for two more O's)
Finally add up the total ...
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Mass Composition
![Foto](/uploads/2/8/3/2/28329237/1639316.jpg)
% by mass for H2O
Estimate the mass of each element in a chemical and determining the percent composition of each.
Example: Water or H2O has 2 H s = 2 * 1g and 1 O = 16g
The total grams / mole is 2 + 16 = 18 g / mol of water
Hydrogen is 2g/18g or 11% by mass and oxygen is 16g/18g or 89% by mass
Types of reactions
![Foto](/uploads/2/8/3/2/28329237/8336158.jpg)
Burning methane is an oxidation reduction reaction.
Activity: Balancing Reactions
Lab: Types of Reactions
Activity: Balancing Reactions
Lab: Types of Reactions
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Stoichiometry
![Foto](/uploads/2/8/3/2/28329237/6246484.jpg)
How much carbon dioxide is made when we burn methane or other fuels?
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Stoichiometry: limiting reagents
![Foto](/uploads/2/8/3/2/28329237/935125.jpg)
Since oxygen is unlimited, we focus on the amount of fuels like methane, alcohol or kerosene to determine the carbon dioxide produced.