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Foldables
Video Clips and Animations
Chapter Summary
Chapter Review Questions
Standardized Test Practice
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Image Bank
Rusted Boat
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Reactions Table
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Conservation of Mass
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Breaking Water into Components
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Burning Match
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Rusted Car
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First Aid Cold Pack
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Fireworks
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Olympic Torch
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Spoiled Strawberries
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Collision Temperature
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Collision in a Crowd
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Reaction Inside Catalysts
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Foldables
Chemical Reactions
Make the following Foldable to help you
understand chemical reactions.
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Foldables
Fold a vertical sheet of paper in half lengthwise
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Foldables
Cut along every third line of only the top layer
to form tabs.
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Foldables
Label each tab.
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Foldables
Research Information
Before you read the chapter, write several
questions you have about chemical reactions on
the front of the tabs. As you read, add more
questions. Under the tabs of your Foldable,
write answers to the questions you recorded on
the tabs.
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Video Clips
Click image to view movie.
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Reviewing Main Ideas
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Formulas and Chemical Equations

• Chemical reactions often cause observable
  changes, such as change in color or odor, a
  release or absorption of heat or light, or a
  release of gas.

• A chemical equation is a shorthand method of
  writing what happens in a chemical reaction.
  Chemical equations use symbols to represent the
  reactants and products of a reaction, and
  sometimes show whether energy is produced or
  absorbed.

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Reviewing Main Ideas
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Formulas and Chemical Equations

• The law of conservation of mass requires that the
  same number of atoms of each element be in the
  products as in the reactants of a chemical
  equation. This is true in every balanced
  chemical equation.

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Reviewing Main Ideas
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Rates of Chemical Reactions

• The rate of reaction is a measure of how quickly
  a reaction occurs.

• All reactions have an activation energya certain
  minimum amount of energy required to start the
  reaction.

• The rate of a chemical reaction can be influenced
  by the temperature, the concentration of the
  reactants, and the exposed surface area of the
  reactant particles.

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Reviewing Main Ideas
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Rates of Chemical Reactions

• Catalysts can speed up a reaction without being
  used up. Inhibitors slow down the rate of
  reaction.

• Enzymes are protein molecules that act as
  catalysts in your bodys cells.

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Chapter Review
Question 1
There are catalysts inside your bodylarge
protein molecules that help speed up reactions
inside your cells and keep you alive. What are
these catalysts called?
A. enzymes B. inhibitors C. products D. reactants
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Chapter Review
Answer
The answer is A.
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Chapter Review
Question 2
Many packaged foods you buy at the grocery store
include some kind of preservative that keeps the
contents fresh longer. Even without knowing what
the exact preservative is, you would assume that
it is some kind of _______.
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Chapter Review
Answer
The answer is inhibitor. The spoiling process is,
in fact, a chemical reaction. The presence of an
inhibitor will decrease that reaction rate and
increase shelf life.
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Chapter Review
Question 3
Many kinds of food need to be refrigerated in
order to keep them from spoiling. Knowing what
you now know about chemistry, can you explain why
this is so?
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Chapter Review
Answer
A decrease in temperature decreases reaction
rates. Since spoilage is a chemical reaction,
refrigeration of perishable food will slow down
its tendency to spoil.
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Chapter Review
Question 4
According to the law of the conservation of mass,
the mass of the _______ must be the same as the
mass of the _______.
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Chapter Review
Answer
The mass of the products must be the same as the
mass of the reactants.
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Chapter Review
Question 5
Endothermic reactions _______ heat energy.
Answer
Endothermic reactions absorb heat energy.
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Standardized Test Practice
Question 1
A greater surface area results in a(n)_______
reaction rate.
A. decreased B. increased C. unchanged D. visible
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Standardized Test Practice
Answer
The answer is B. This is why breaking up a big
log into smaller pieces makes it more likely to
burn. A pile of smaller pieces has much more
surface area than one big log.
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Standardized Test Practice
Question 2
Burning is an _______ chemical reaction.
A. endothermic B. exothermic C. exoskeletal D.
existential
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Standardized Test Practice
Answer
The answer is B. Since heat is released the
chemical reaction causing it must be exothermic.
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Standardized Test Practice
Question 3
Rusting is an example of an _______ chemical
reaction.
A. endothermic B. exothermic C. endogenous D.
exogamous
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Standardized Test Practice
Answer
The answer is B. You cannot sense the heat being
released when iron rusts because of the slow
reaction rate. Still, it is an exothermic
chemical reaction.
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Standardized Test Practice
Question 4
In reactions that absorb energy, the reactants
are _______.
A. less stable B. more stable C. perfected D.
unstable
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Standardized Test Practice
Answer
The answer is B. The reactants are more stable
and their bonds have less energy than the bonds
of their products.
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Standardized Test Practice
Question 5
Even if it isnt written into a chemical
equation, _______ is always part of any chemical
reaction.
A. energy B. sound C. tonality D. vibration
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Standardized Test Practice
Answer
The answer is A. Energy may be needed to start
the reaction or it may be given off as a result
of the reaction, but it is always involved.
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End of Chapter Resources File