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Chemical Changes

Presented by: Bailey Newbill. Chemical Changes. What is a chemical change?. A chemical change is a process that leads to the transformation of one substance to another. http://www.brainpop.com/science/matterandchemistry/propertychanges/. When do chemical changes occur?. Everyday!

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Chemical Changes

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  1. Presented by: Bailey Newbill Chemical Changes

  2. What is a chemical change? • A chemical change is a process that leads to the transformation of one substance to another. • http://www.brainpop.com/science/matterandchemistry/propertychanges/

  3. When do chemical changes occur? • Everyday! • You may not know it,but chemical changes happen all around us!

  4. What are some examples? • Some examples of them include: • Cooking an egg • Or baking a cake

  5. More examples... • Spoiled milk...yes,it may seem gross but it is changing from a liquid to a solid. • A cut apple becoming brown (decaying)

  6. ...examples... • Fireworks ...are actually metal that explode with color into the air when heat is applied. • Leaves changing color....from green to yellow,red,then brown.

  7. Changes • The changes don't always happen in familiar substances for instance: • Vapors of hydrogen chloride in a beaker and ammonia in a test tube form together to make a cloud of a new substance...ammonium chloride.

  8. Continued • And to make water molecules H2O: • Two molecules of hydrogen come together with one molecule of oxygen to go from two different kinds of gases to one liquid...commonly known as water.

  9. 6 types of chemical changes • Combustion • Synthesis • Decomposition • Single displacement • Double displacement • Acid -base

  10. Combustion • A combustion reaction is when oxygen combines with another compound to form water and carbon dioxide. C10H8 + 12 O2 ---> 10 CO2 + 4 H2O

  11. Synthesis • Synthesis: A synthesis reaction is when two or more simple compounds combine to form a more complicated one. These reactionscome in the general form of: • A + B ---> AB

  12. Decomposition • Decomposition:a decomposition reaction is the opposite of a synthesis reaction- a complex molecule breaks down to make simpler ones. These reactions come in the general form: AB ---> A + B

  13. Single Displacement • Single displacement: This is when one element trades places with another element in a compound. These reactions come in the general form of: • A + BC ---> AC + B

  14. Double Displacement • Double displacement: This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form: • AB + CD ---> AD + CB

  15. Acid-base • This is a special kind of double displacement reaction that takes place when an acid and base react with each other. The H+ ion in the acid reacts with the OH- ion in the base, causing the formation of water. Generally, the product of this reaction is some ionic salt and water: • HA + BOH ---> H2O + BA

  16. References and sources • Definitions from wikipedia and mr.guch.brinkster.net/6typesofchemicalrxn.html • Pictures fromwww.eggs.comhttp://210teenlibrary.files.wordpress.com/2009/07/fireworks.jpg

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