Balancing chemical equations and calculations using equations

In summary, the speaker had a lot of homework on their first day back and requested for someone to check if they did it correctly. They provided links to images of their work and asked for help with balancing equations and counting elements. The speaker also mentioned receiving positive feedback on their mole-mole page.
  • #1
Matt1234
142
0
Hi there,

Had a fair bit of hoework my first day back with no answers. Would anyone mind looking over these to see if i did them correctly?
Thank you for your time.

http://img42.imageshack.us/img42/5117/46730937.jpg
http://img35.imageshack.us/img35/4489/56478985.jpg
http://img42.imageshack.us/img42/7176/29465682.jpg
http://img35.imageshack.us/img35/4357/28514399.jpg
 
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  • #2
First worksheet:
3. Part of your answer got cut off and it looks like it says only "Cl" on the right. I would double check that equation balancing.
4. You're off to a good start but count how many of each element you have on each side.

I didn't look at all of the rest but I did look at your whole mole-mole page and that looks great, good job!
 
  • #3
Thank you for your time molly. I made corrections to my sheet. :)
 

1. What is the purpose of balancing chemical equations?

The purpose of balancing chemical equations is to ensure that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. This is necessary because atoms cannot be created or destroyed during a chemical reaction, so the total mass of the reactants must be equal to the total mass of the products.

2. How do you balance a chemical equation?

To balance a chemical equation, you must adjust the coefficients (numbers in front of each molecule) so that the number of atoms of each element on both sides of the equation is equal. Start by balancing the elements that appear in only one molecule on each side, and then work your way through the rest of the elements until the equation is balanced.

3. What are the rules for balancing chemical equations?

The rules for balancing chemical equations include:

  • Atoms cannot be created or destroyed, so the number of each type of atom on the reactant side must be equal to the number on the product side.
  • Only coefficients can be changed, not subscripts.
  • Coefficients can be reduced to their lowest whole number ratio.
  • The same coefficient must be applied to all atoms in a molecule.

4. How do you know when a chemical equation is balanced?

A chemical equation is considered balanced when the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. Additionally, the coefficients should be in their lowest whole number ratio and the same on both sides of the equation.

5. How can you use balanced chemical equations to calculate quantities in a reaction?

Balanced chemical equations can be used to calculate quantities in a reaction through the use of stoichiometry. By knowing the balanced equation and the molar ratios between the reactants and products, you can calculate the amount of a substance needed or produced in a reaction. This can also be used to determine the limiting reactant and the theoretical yield of a reaction.

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