Unformatted text preview: Chemical Reactions and Balancing Chemical Equations Web Quest
Class:_____ Chemical Equations
1. What three things does a balanced equation show you?
A. The __________________
which enter into a reaction.
B. The _________________ which are formed by the reaction.
C. The amounts of each substance ____________
and each substance
2. What two things must we remember when balancing equations?
A. Every chemical compound has a _______________
which cannot be
B. A chemical _______________
must account for every atom
___________ that is used, which
is an application of the Law of ______________________ of matter
3. What does the
the reaction is reversible
4. What does the
Classic ChemBalancer –
(1) Click the button for “Directions” and read carefully. Click the “OK” button and return to the
(2) Click “Start Game” button to give it a try!
(3) Start by adding a “1” in each box and compare the number of atoms of each element you
have on each side of the equation.
(4) Change coefficients to balance each equation and click the “Balanced” button to check it. If it
is wrong, correct it!
(5) Use the information in the pop-up windows to answer each question and then write the
balanced equation before clicking the “OK” button.
#1 What does “ferrum” mean?
What color is sulfur?______________ #3 #2 What is HCl?__________________________
Where is it found in the body?____________
in the stomach #4 What are pyrotechnics?
a fireworks display #5 What was the Hindenberg?
a German passenger airship
What gas was used in it? #6
hydrogen What does the symbol “Hg” represent? Mercury
Why should you never touch it?
because it is poisonous #7 What gas is produced when calcium metal
is dropped in water?
hydrogen gas #8 What is CH4?
What gases is it related to? Hydrogen peroxide
What is H2O2? _________________________
What is it used for?
to prevent infection of minor cuts, scrapes, and burns.
______________________ carbon dioxide and oxygen #9 What is ammonia used for today?
a refrigerant gas, for purification of water supplies,
_____________________________________ #10 How is the oxidation of aluminum different
from that of iron?
Aluminum doesn't contain iron or steel so it doesn't rus
_______________________ #11 What gas is released when potassium
permanganate is decomposed?
manganese dioxide and oxygen gas.
____________ Now go to this website and work on balancing the equations. Read the directions (due to the program you will need to include coefficients of “1”, unlike when we balance normally in
You can complete a problem and go to the bottom of the page and click “check” whenever
you’d like. Use the back button to continue working. Fill in the Coefficients on the follow
2 H2 + 2. 3 H2 + 3. 2 Al2O3 → 1. Text O2 → 2 H2O
N2 → 2 NH3
4 3 Al + O2
4. 2 2 KClO3 → O2
5. Text S8 + Text Text O2 → SO2
6. Text C2 H 6 + Text Text O2 → Text CO2 + H2O
8. Text Text Al2(SO4)3 +
P4 + Text O2 → Text Ca(OH)2 →
Al(OH)3 + Text CaSO4
9. Text Ag + Text S8 →
10. Text Text Al + Text Cr + Text NaClO3 → Text Br2 → AlBr3
11. Text Text O2 → Cr2O3
12. Text NaCl + Text O2
13. Text AlBr3 + Text Text Cl2 → AlCl3 + Text Br2
14. Text Na + Text H2O → Text NaOH + Text H2
15. Text AlI3 + Text HgCl2 → Text AlCl3 + Text HgI2
16. Text Ca(OH)2 + Text H3PO4 → Text Ca3(PO4)2 + Text H2O
17. Text AgNO3 + Text K3PO4 → Text Ag3PO4 +
18. Text C3 H 8 + Text O2 → Text CO2 + Text H2O
19. Text C2 H 2 + Text O2 → Text CO2 + Text H2O
Text C6 H 6 + Text O2 → Text CO2 + Text H2O
20. Load the simulation Balancing Chemical Equations
1. Explore the Balancing Chemical Equations simulation.
a) What are the different ways that the simulation indicates when an equation is balanced?
it shows the balance and then shows the amount of each element and when they are balanced it shows a happy face. Than the graph bars do the same thing
except it shows an equal sign when it’s balanced. 2. For each balanced reaction, indicate the total number of molecules in the table below.
Reaction Total Number of Molecules
(Left) Product Side
(Right) Make Ammonia 8 8 Separate Water 6 6 Combust Methane 5 5 3. Is the number of total molecules on the left side of a balanced equation always equal to the
number of total molecules on the right side of the equation? Explain your answer.
Yes because nothing was added or subtract. They have just reduced it to the greatest common factor and combined them. 4. For each balanced reaction, indicate the total number of atoms in the table below.
Reaction Total Number of Atoms
(Left) Product Side
(Right) Make Ammonia 8 8 Separate Water 6 6 Combust Methane 9 9 5. Is the number of total atoms on the left side of a balanced equation always equal to the
number of total atoms on the right side of the equation?
Yes because both sides need to have the same amount so it is even. 6. What is the same on the left and right side of a balanced equation? Explain your answer.
The total number of molecules and the total number of atoms because it will not be the balanced if both sides for each didn’t have the same amount. 7. Play level 1 and 2 of the balancing equation game. Write down the strategies you use to
balance chemical equations.
I started with the final product and worked my way backwards. Then to double check I made sure each side had the same amount.
Image of page 2 8. In the simulation, were you able to use noninteger numbers (like ½ or 0.43) for the
coefficients in a balanced equation?
Why do you think this is?
no there is no such thing as having a compound without full atoms and molecules a) Which of the following are coefficients you could use in a balanced equation?
b) If you were balancing an equation containing the O2 molecule, which of the following
would be correct representations of O2 and its coefficient?
9. What do you have to do to the coefficients of equation I below to get to equation II?
2 SnO2 + 4 H2 ! 2 Sn + 4 H2O you would have to reduce it to the common factor of 2
SnO2 + 2 H2 ! Sn + 2 H2O
a) Both equation I and II are balanced, but equation I is the correct way to write the
b) Can you divide equation II by another factor and still have it be correct? Why or why
No, because if we divide it by another factor we would have a half atom, which is impossible. c) In a complete sentence, write down a method you could use to determine if an equation is
written in the correct way.
To have an equation that is written in the correct way we must first make sure that we write thenumber atoms first, then write
the atom in each compound and make sure both sides have the same number of atoms. 10. Start level 3 of the balancing equation game. Write down the equations as you solve them,
along with any new strategies you needed for balancing.
4NH +3O2=2N2+6H20 ...
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