Download How Atoms Rearrange

How Atoms Rearrange
Focus Question: What happens to the atoms in substances when chemical reactions occur?
Read page 63-66, How Atoms Rearrange. Record the following in your science notebook.
1. Write the correct chemical reaction (using chemical formulas) for the reaction that blew up the Hindenburg.
a. The reactants are…
b. The products are…
2. Combustion is…
3. Write out and balance the following chemical reaction:
CuCl2 + Al  AlCl3 + Cu
a. The reactants are…
b. The products are…
4. Explain why there is a 3 in front of CuCl2 and Cu in the chemical equation.

5. Conservation of Matter means…
Write this paragraph
out!
Atoms are not _______________ or _____________ during a chemical reaction.
Scientists know that there must be the ___________ number of atoms on each ___________ of the ____________.
To balance the chemical equation, you must add _______________ in front of the chemical formulas in the equation.
You cannot _______ or ___________ subscripts!
6. Methane (CH4) is the main gas in natural gas. The products that form when methane burns are carbon dioxide
and water. Write a balanced equation showing the combustion reaction for methane.
7. List the symbols for the atoms in each formula and give the number of each.
C2H6
2 MgO
4 P4O10
NH3
3 Al(OH)3
2 H2O2
8. Write out the following chemical equations. Changing JUST the coefficient (the number in front of the molecule) make
each side balance.
1) Determine number of atoms for each
1.
Na + MgF2  NaF + Mg
2.
Mg + HCl MgCl2 + H2
3.
Cl2 + KI KCl + I2
4.
NaCl  Na + Cl2
5.
Na + O2 Na2O
3) Add a coefficient in front of the formula
with that element and adjust your counts.
6.
Na + HCl H2 + NaCl
4) Repeat steps 1-3 until all is balanced
7.
K + Cl2  KCl
**Remember – you can only change the
coefficients (the big numbers) - not the
subscripts (the little numbers)
Challenge: This one is tough!
C2H6 + O2  CO2 + H2O
element.
2) Pick an element that is not equal on both
sides of the equation.