IGCSE 11.5.1
- 2. Irreversible reactions Most chemical reactions are considered irreversible – the products that are made cannot readily be changed back into their reactants.
- 3. Irreversible reactions Most chemical reactions are considered irreversible – the products that are made cannot readily be changed back into their reactants. For example, when wood burns it is impossible to turn it back into unburnt wood again!
- 4. Irreversible reactions Most chemical reactions are considered irreversible – the products that are made cannot readily be changed back into their reactants. For example, when wood burns it is impossible to turn it back into unburnt wood again! Similarly, when magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen, it is not easy to reverse the reaction and obtain the magnesium.
- 5. What are reversible reactions? Reversible reactions occur when the backwards reaction (products reactants) takes place relatively easily under certain conditions. The products turn back into the reactants. A + B C + D (reactants) (products) For example, during a reversible reaction reactants A and B react to make products C and D. However, products C and D can also undergo the reverse reaction, and react together to form reactants A and B.
- 6. What are reversible reactions?
- 7. What are reversible reactions? Reversible reactions occur when the backwards reaction (products reactants) takes place relatively easily under certain conditions. The products turn back into the reactants.
- 8. What are reversible reactions? Reversible reactions occur when the backwards reaction (products reactants) takes place relatively easily under certain conditions. The products turn back into the reactants. A + B C + D (reactants) (products)
- 9. What are reversible reactions? Reversible reactions occur when the backwards reaction (products reactants) takes place relatively easily under certain conditions. The products turn back into the reactants. A + B C + D (reactants) (products) For example, during a reversible reaction reactants A and B react to make products C and D.
- 10. Reversible biochemical reactions Many biochemical reactions (those that take place inside organisms) are reversible. For example, in the lungs, oxygen binds to haemoglobin (Hb) in red blood cells to create oxyhaemoglobin. When the red blood cells are transported to tissues, the oxyhaemoglobin dissociates back to haemoglobin and oxygen. Hb + 4O2 Hb.4O2 There are also some very important industrial reactions, like the Haber process, that are reversible.