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Exothermic and Endothermic
Reactions
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Endothermic process: a
change (e.g. a chemical
reaction) that requires (or
absorbs) heat.
Photosynthesis is an
endothermic reaction
(requires energy input
from sun)
Forming Na+
and Cl- ions
from NaCl is an
endothermic
process
Measuring Heat
Endothermic
reaction, heat
taken in &
temperature of
the substance
drops
reaction
Ammonium nitrate + water
Starting temperature 20⁰ C
Add ammonium nitrate to water
a temperature decrease of 8⁰ C
EXOTHERMIC & ENDOTHERMIC REACTIONS
Exothermic process: a
change (e.g. a chemical
reaction) that releases
heat.
Burning fossil
fuels is an
exothermic
reaction
Heat Released
reaction
Exothermic
reaction, heat
given off &
temperature of
substance
rises.
Examples
Exothermic
• Combustion of fuels
• Yeast & Hydrogen
Peroxide
• Epson salts & water
© Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910
Endothermic
•
•
Photosynthesis
Acetic Acid &
Sodium Bicarbonate