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Links for Chapter 14: Energy changes in reactions

Video clips and animations

Energy changes during reactions

Neat animation showing how bond making and breaking relates to activation energy, and whether a reaction is endothermic or exothermic. YouTube

An exothermic reaction - sodium and chlorine

The exothermic reaction between sodium and chlorine. YouTube

An exothermic reaction - iron and sulfur

This shows the reaction between sulfur and iron wool to make iron(II) sulfide. This reaction is normally done by heating a mixture of sulfur and iron filings, but this is much more spectacular. As well as heat and light, energy is also released as sound. From Mike Thompson's ChemPics on YouTube. If you are interested, and look under "More from ChemPics" to the right of the video, you will find two other versions of this using different sized tubes, which produce different notes.

An exothermic reaction - the thermite reaction

A quite long (almost 6 minutes) lecture demonstration from Bob Burk. It uses the thermite reaction and the rusting of iron to illustrate the fact that you can't tell how exothermic a reaction is just by looking at it. Good stuff! YouTube

The reaction between calcium oxide and ater

A short quirky video of how to fry an egg using calcium oxide and water. YouTube

Heating copper(II) carbonate

The effects of heat on carbonates are classic endothermic changes. This very short clip shows the effect of heating copper(II) carbonate, and tests for the carbon dioxide evolved using lime water. Notice the change from the green copper(II) carbonate to black copper(II) oxide. YouTube


Instructions for practical work

I have referred to practicalchemistry.org as a reliable source of instructions for experiments. If you find anything really good from other sources, could you let me know via the address on the about this site page of Chemguide.

Energy changes and fuels menu

Large number of assorted experiments based around energy changes during reactions.


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© Jim Clark 2009