Chapter 4, section 3
Controlling Reactions
LT: I will describe how Chemical
Reactions are controlled.
Agree
Disagree
1._______
It is possible to control the speed of a
________ chemical reaction
2._______
All chemical reactions require energy to
________ begin.
3._______
The cooler a substance is, the faster it will
________ reaction with another substance.
4._______
The more surface area a substance has
________ exposed, the slower it will react.
5._______
Room temperature is hot enough to cause
________ some chemicals to react.
I. Energy and Reactions
A. Activation Energy – energy needed
to start a chemical reaction.
1. Examples: heat, electricity
http://www.youtube.com/watch?v=VbIaK6PLrRM
http://www.youtube.com/watch?v=9rR6OEQRFZQ&feature=endscreen&NR=1
http://www.youtube.com/watch?NR=1&v=FQGtpo2IUxA
II. Rates of Chemical Reactions
A. More surface area =faster reaction
B. hotter temp. = faster reaction
colder temp. = slower reaction
C. Concentration – the amount of a
substance in a given volume.
high concentration = faster reaction
D. Catalyst – material that increases
the rate of a reaction
http://www.youtube.com/watch?v=085e-ALKmUM
Agree
Disagree
1._______
It is possible to control the speed of a
________ chemical reaction
2._______
All chemical reactions require energy to
________ begin.
3._______
The cooler a substance is, the faster it will
________ reaction with another substance.
4._______
The more surface area a substance has
________ exposed, the slower it will react.
5._______
Room temperature is hot enough to cause
________ some chemicals to react.
http://www.youtube.com/watch?v=2qlb8X_ffO8&feature=related