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Physical and Chemical Changes Project

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by

Gemma :D

on 29 June 2011

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Transcript of Physical and Chemical Changes Project

Mowing the Lawn Chopping Wood Change of Size Melting Butter Steam on the Bathroom
Mirror After a
Hot Shower Change of State Crushing a Can Crumpling a Piece of Paper Change of Shape Physical and Chemical Changes Mowing the lawn is a change of size becuase you are shortening the length of the grass. Chopping Wood is a change of size because you are chopping the wood into smaller pieces. Melting butter is a change of state because the butter is melting from a solid to a liquid. Steam on the mirror is a change of state because the steam in the air is turning back to a liquid. Crushing a can is a change of size becuase the can is still whole but it has compacted in size. Crumpling a piece of paper is a change of size
becuase the piece of paper is still whole but the size is smaller. A Solid Appears
or Disappears Bubbles Appear The Temperature
Goes Up or Down A Flame or
Light Appears A Change in
Colour Appears Cheese Cheese is an example of a solid
appearing because the two liquids
produce a solid. casein + ascorbic acid ---> large protein molecules heat reactant + reactant ---> product heat C47H48N3NaO7S2 + C6H8O6 ---> large protein molecules heat Iron Damp Air Rust Chemical
Changes Physical Changes Rust Rust is an example of a change in coulour because when iron is with oxygen in damp conditions the iron turns brown. The brown is the rust. iron + water + oxygen = hydrated iron oxide Fe + H2O + O = Fe2O3H2O reactant + reactant +reactant = product Nails with rust Acetic acid and Sodium hydrogen Carbonate (solid) acetic acid + sodium hydrogen carbonate ---> sodium acetate reactant + reactant ---> product CH3COOH + NaHCO3 ---> CO2 +H2O +NaCH3COO Acetic acid and Sodium hydrogen carbonate is an example of the temperature going up or down because when you add the two compounds together the temperature goes down. Bibliography Burning Wood A Smell is Given Off Wood is an example of a chemical change because once the wood turns to ash it can not be turned back into wood. When you burn wood a smell is given off with the smoke. wood + oxygen ---> carbon dioxide + water heat reactant + reactant ---> product + prdouct heat CH2O + O2 ---> CO2 + H2O heat Wood is made up of a series of complicated molecules containing Carbon, Hydrogen and Oxygen. Burning Magnesium magnesium + oxygen ---> magnesium oxide heat reactant + reactant ---> product Mg + O2 ---> MgO2 These pictures show magnesium ribbon giving off a bright light. After the bright light the magnesium ribbon turns intp a white powder. This is because a chemical change has occoured. While the Magnesium was being heated Oxygen was being introduced to the Magnesium. This is a chemical change amd can't easily be reversed. heat heat Antacid Tablets in Water Antacid Tablet + Water ---> Dissolved Antacid Reactant + Reactant ---> Product CaCO3 + H2O When you put antacid tablets in water they fizz up and create bubbles.
This is gas escaping. Andrew Radar Studios Chem4Kids.com http://www.chem4kids.com/files/matter_chemphys.html 8/6/11
About.com Chemistry http://chemistry.about.com/od/lecturenotesl3/a/chemphyschanges.htm 8/6/11
Chemie in 11. http://www.chemiein11.nl/en/?thepage=hst3 17/6/11
Aus-e-tute http://www.ausetute.com.au/chemphys.html 17/6/11
The Wright Stuff http://www.sky-web.net/science/reaction-types.htm#acidbase 17/6/11
ExRx.net Vitamin C 26/5/11 http://www.exrx.net/Nutrition/Antioxidants/VitaminC.html 25/6/11
Chemical Book http://www.chemicalbook.com/ChemicalProductProperty_EN_CB8677929.htm Usborne Publishing Usborne http://www.usborne-quicklinks.com/int/int_entity_pages/int_select_link.asp?lang=int&lvl=2&id=596&From=80&To=81 17/6/11
Kids Crafts Chemical Formula http://www.chemicalformula.org/chemistry-help/corrosion 17/6/11
Challenging Technologies DPC http://www.dpchallenge.com/image.php?IMAGE_ID=395234 17/6/11
Rogers K, Howell L, Smith A, Clarke P, Henderson C 2002 The Usborne Internet Linked Science Encyclopedia with 1,000 recommended websites Usborne Publishing London, England
National Library of Medicines Tox Town http://toxtown.nlm.nih.gov/text_version/chemicals.php?id=84 26/06/11
Cavemen Chemistry http://www.cavemanchemistry.com/oldcave/projects/fire/ 26/06/11
Kboudrea Burning Magnesium http://www.angelo.edu/faculty/kboudrea/demos/burning_magnesium/burning_magnesium.htm
Chemistry 104 http://www.chem.latech.edu/~deddy/chem104/104Antacid.htm 28/06/11
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