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SNC 1D1 – Properties of Hydrogen Peroxide

SNC 1D1 – Properties of Hydrogen Peroxide hydrogen peroxide (H 2 O 2 ) is commonly found in whitening agents such as toothpaste. unlike water, hydrogen peroxide contains one more oxygen atom and is given the per- designation short for hyper or thoroughly.

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SNC 1D1 – Properties of Hydrogen Peroxide

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  1. SNC 1D1 – Properties of Hydrogen Peroxide hydrogen peroxide (H2O2) is commonly found in whitening agents such as toothpaste. unlike water, hydrogen peroxide contains one more oxygen atom and is given the per- designation short for hyper or thoroughly. a molecule of hydrogen peroxide will break apart into stable water and oxygen. 2 H2O2 → 2 H2O + O2 the extra oxygen atom makes hydrogen peroxide more reactive than water. the extra oxygen atom reacts well with chemical pigments that give materials their colours and is an effective bleach.

  2. Hydrogen peroxide is also an effective antiseptic. It reacts with bacteria and destroys them. • It is commonly used in contact lens solutions and topical antiseptics. • Under normal conditions hydrogen peroxide breaks down slowly into water and oxygen. • Care must be taken when storing hydrogen peroxide to minimize the amount of oxygen gas that accumulates in the container. • The decomposition of hydrogen peroxide can be accelerated by using a catalyst. A catalyst is any substance that speeds up a reaction but is not chemically used itself. • Catalysts don’t take part in reactions but create more favourable conditions for reactions to occur.

  3. Homework: Page 273 # 1 - 7

  4. Decomposition of Compounds Decomposition is a chemical change in which compounds are broken down into simpler substances. nitroglycerin found in dynamite in explosives. It quickly decomposes into smaller molecules like nitrogen and carbon dioxide. the energy released in the explosion makes the gases move very quickly and the rapidly expanding gases give dynamite its power. usually compounds don’t break themselves down but they may be decomposed using: Electricity Thermal energy

  5. Nitroglycerin molecule

  6. Electrolysis: water is a very stable compound. Water will chemically break down into hydrogen and oxygen when electricity is passed through the water. Hydrogen gas (H2) is produced at twice the rate of oxygen gas (O2). Electrolysis of water can occur with a Hoffmann apparatus. Heating and Decomposition: Decomposition occurs when lighting a match. The match head contains potassium chlorate (KClO3) Striking a match causes the KClO3 to decompose into O2 and KCl the oxygen released in decomposition then causes other chemicals to burn.

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