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Daniel R. Barnes: [email protected]
Chemistry
6/30/2017 2:55 AM
Name: ___________________________________________ Seat#: ________
Period: _______ Date: ____________________________________________
PHC 11.1 “Describing Chemical Reactions”
Reading Guide
(Designed to be used with Prentice Hall’s Chemistry textbook, 2005 printing)
Connecting to Your World
1. Name two properties of hydrogen gas: one that made it useful to the Hindenburg, and one that made it
dangerous to the Hindenburg.
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2. What chemical reaction happened in/on/around the Hindenburg on May 6, 1937? ______________________
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Writing Chemical Equations
1. Name some chemical reactions that happen in living things. _______________________________________
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2. In a chemical reaction, _______________________________ turn into ______________________________.
3. Write a word equation for the reaction where zinc and hydrochloric acid react to form hydrogen gas and zinc
chloride.
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4. Convert the following word equation into an English sentence:
Copper + ammonium sulfate  copper (II) sulfate + ammonia + hydrogen gas
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5. “H2O” is the _______________________________________________________ for water.
6. (s) = _________________________, (l) = _____________________________, (g) = ____________________
(aq) = _____________________________________________________________________________________
Balancing Chemical Equations
1.a. Look carefully at the equations on pages 324 & 325 for making bicycles. What would be the skeleton
equation for using boards, wheels, and trucks to make skateboards? Assume that it takes one board, two trucks,
and four wheels to make a single skateboard.
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1.b. Now, write the balanced equation for making skateboards.
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2. The little numbers inside of a formula (like the “2” in “H2O”) are called “_______________________________”.
In a chemical equation, the big numbers in front of the formulas are called “_____________________________”.
3. The law of ______________________________ of mass says that the mass of the
________________________________ that go into a reaction must equal the mass of the
__________________________________ that they turn into.
4. What does happen to atoms during a chemical reaction? __________________________________________
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5. What doesn’t happen to atoms during a chemical reaction? ________________________________________
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6. A ___________________________ equation has no coefficients (no flesh), so there is a good chance that it is
not ____________________________________ yet.
7. On page 326, the reaction on the right is said to violate the
law of conservation of mass.
Write letters inside the circles to show what element each atom
belongs to.
Explain how the reaction pictured here violates the law of
conservation of matter.
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8. A student looks at the following equation: H2 + O2  H2O
He attempts to balance it by writing the following: H2 + O2  H2O2
What is wrong with what he did? _______________________________________________________________
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9.a. Turn back for a moment to page 257 and look at table 9.3. List the formulas and names of four polyatomic
ions that have a charge of 2-.
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9.b. Why are they called “polyatomic” ions?
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10. In the expression “5Al2(SO4)3” there are 10 aluminum atoms, 15 sulfur atoms, and 60 oxygen atoms
indicated. Why is this?
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11. Normally, we balance equations by making sure that the number of atoms of each element is the same on
the left of the arrow as it is on the right. Describe a shortcut that can be used to balance the following equation:
Ca3(PO4)2 + HCl  CaCl2 + H3PO4
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