Name _____________________________________ Period ____
What triggers a chemical reaction?
http://ed.ted.com/lessons/what-triggers-a-chemical-reaction-kareem-jarrah#review
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1. An increase or decrease in energy during a chemical reaction is called _____.
a. Exothermic
b. Endothermic
c. Enthalpy
d. Entropy
2. When a neat, ordered chemical is changed into a more disordered chemical, there is an
increase in _____.
a. Entropy
b. Exothermic
c. Chemical
d. Endothermic
3. The chemicals you begin a reaction with are called the _____ and the chemicals you have at
the end of a reaction are called the _____.
a. Products, reactants
b. Reactants, products
c. Enthalpy, entropy
d. Entropy, enthalpy
4. Which of the following is an example of an exothermic reaction?
a. Burning wood
b. Activating an ice pack
c. Both of the above
d. None of the above
5. Everything you see around you is made of chemicals: the air that you breathe, the water that
you drink, and the chair you are sitting on. Entropy is a characteristic of all chemicals, and more
ordered chemicals have lower entropy. List two chemicals that you think have low entropy and
two that have high entropy. Explain the reason for your choices.
6. If an exothermic chemical reaction occurs, the surroundings become warmer. Where does this
energy come from?
7. Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one
reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy. A
second chemical reaction she is trying to run is endothermic and there is a decrease in entropy.
Which of the two reactions is more likely to occur and why?