Learn about and revise energy changes in chemical reactions with this BBC Bitesize GCSE Combined Science (OCR 21C) study guide.

So, an exothermic reaction means that more energy goes out or is released by the reaction than goes into it. This leaves the reaction mixture at a higher temperature. 4 Explain. Step 6 Explain how ...

Save guides, add subjects and pick up where you left off with your BBC account. A reaction profile includes the activation energy, which is the minimum energy needed by particles when they collide ...

Since more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants, the reaction is exothermic, and the temperature goes up. Lesson 6.5: A ...

Chemical reactions with activation barriers generally slow to a halt in the extreme cold of dense interstellar clouds. Low-temperature experiments on the reaction of OH with methanol have now ...