Endothermic and Exothermic Reactions
Scenario
1
Your car burns gasoline as you drive
from home to school
Endothermic or Exothermic?
Explain.
Exothermic – “burning “ releases
energy
2
Jerry is baking homemade bread in
the oven.
Endothermic – “baking” absorbs
energy
3
The ice melts in your glass of water.
Endothermic – “melting” absorbs
energy
4
Sodium and chlorine combine in an
explosive reaction to form table salt.
Exothermic – “explosive” shows
releasing energy
5
Barry Balloon lights his candles to get Exothermic – “lighting” candles
his hot air balloon to fly.
releases energy
6
Water freezes on the pavement and
the roads become icy.
Exothermic – “freezing” releases
energy
7
Mom puts a pot of water on the
stove and the water begins to boil
Endothermic – “boiling” absorbs
energy
8
Water condenses on the side of your Exothermic - “condensation” releases
glass of cold lemonade.
energy
9
A glass of water left out overnight
evaporates.
10
A plant carries out photosynthesis.
Endothermic – “evaporation” absorbs
energy
Scenario
11
A tree grows.
12
Sally gets really sweaty as she runs.
Then she stops running and the
sweat evaporates.
Endothermic or Exothermic?
Explain.
Endothermic – “growing” absorbs
energy
Endothermic – “evaporation” absorbs
energy
(Hint: A 2-part question)
13
The snow melted when we finally had Endothermic – “melting” absorbs
a warm day last week!.
energy
14
Corey Chemistry adds hydrochloric
acid slowly to water and notices that
the flask feels hot.
The trainer shakes a cold pack to
put it on an injured student’s knee.
Exothermic – the flask feeling hot
shows a release of energy
16
An egg is cooked in a frying pan.
Endothermic – “cooking” absorbs
energy
17
Perry fills his pipet with a mixture of
hydrogen and oxygen gas to prepare
for the micro-rocket launch. When
he squeezes the gas mixture over the
Bunsen burner, there is a loud pop.
A frozen pond in the winter provides
a place for the ice hockey team to
practice.
Wood burns in the fireplace on a
cold winter night.
Exothermic – the “loud pop” shows
that there was a release of energy
15
18
19
Endothermic – the cold pack absorbs
energy
Exothermic - “freezing” releases
energy
Exothermic - “burning” releases
energy