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endothermic & exothermic reactions

Exothermic and Endothermic Reactions
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Exothermic and Endothermic Reactions

It can seem that all chemical reactions are exothermic: They transfer heat to their surroundings. Bonfires, bombs, and rusting fenders are all exothermic.

But we couldn't live without endothermic reactions, which take energy from their surroundings. Photosynthesis is a bunch of endothermic reactions. Explore both.

BBC
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Effects of Salt on Water

Effects of Salt on Water

Why does an endothermic reaction occur when salt is added to water? See how a group of scientists answer this question from a junior high student. More...

Article
Argonne National Laboratory
Endothermic

Endothermic

A chemist from the University of Nottingham offers a chilling demonstration of an endothermic reaction, as a wild-haired professor brings the subject to life. More...

Video
Periodic Videos
Fantastic Foamy Fountain

Fantastic Foamy Fountain

How can common household ingredients combine to create a fountain of foamy suds? Watch the video and then create your own fantastic fountain of foam with this hands-on activity. More...

Activity
Science Bob
Hot Ice or Sodium Acetate

Hot Ice or Sodium Acetate

Exothermic reactions can be surprising. Imagine a cold liquid that turns warm and freezes at the same time. Using only baking soda and vinegar, you can make that liquid. More...

Activity
About.com
Cold Pack Chemistry: Where Does the Heat Go?

Cold Pack Chemistry: Where Does the Heat Go?

Learn about endothermic reactions with this activity. But make sure to wear goggles and gloves, and get expert help, so you don't learn about getting hurt by ammonium nitrate.
More...

Activity
Science Buddies
Endothermic and Exothermic Reactions

Endothermic and Exothermic Reactions

If you need help producing energy diagrams showing endothermic and exothermic reactions, you’ll find it here. More...

Video
Bozeman Science
Endothermic Definition

Endothermic Definition

Watch out! In biology, an endotherm is a “warm blooded” animal that generates heat, so as to keep its body at a set temperature. So the same word has opposite meanings in biology and chemistry. More...

Article
Answers.com
Exothermic

Exothermic

The rate of an exothermic reaction is what makes the difference between a pleasant warming and a massive KABAANG. More...

Video
Periodic Videos
Hand Warmers

Hand Warmers

Explore several exothermic reactions. Then pick the best one for creating hand warmers. Be careful handling the calcium oxide — it can be quite caustic! More...

Activity
PBS
Hydrogen and Oxygen Combination

Hydrogen and Oxygen Combination

Use a cold needle to pop a balloon filled with hydrogen gas...and not much happens. Use a hot needle, and you'll be mopping up the result. More...

Article
Argonne National Laboratory
Transferring Heat Energy

Transferring Heat Energy

Play this tutorial for an excellent audio and visual explanation of the difference between exothermic and endothermic reactions. Try the quiz, too. More...

Interactive
Sophia Learning

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