11HWChp5 - Module1 The Chemical Earth Yr 11 Homework Due:_...

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Module1 The Chemical Earth Yr 11 Homework Due:_________________________ Answer the following questions from Chemistry Contexts 1 pp57 - 80 Chapter 5. Chemical Change 1. Explain in your own words the difference between a physical and chemical change. Give an example of each. 2. Classify the following as physical or chemical changes: a. Chopping wood b. Burning wood c. Melting candle wax d. Burning candle wax e. Rusting iron f. Dissolving sugar in tea g. Forming an iron nail from an iron block h. Boiling an egg 3. (i)The process of forming ‘dew’ can illustrate the condensation of water vapour from a gas to liquid state. (ii)When hydrogen gas and oxygen gas react explosively they form liquid water. a. Identify the process as a physical or chemical change b. Explain at a molecular level and using the particle model the changes occurring c. Predict in a relative amount whether energy is released or absorbed 4. Explain why you must always balance chemical equations so that the number of atoms of each element on the left hand side equals the number
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This note was uploaded on 09/27/2010 for the course 56 1121 taught by Professor Khjdf during the Spring '10 term at Mackenzie.

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11HWChp5 - Module1 The Chemical Earth Yr 11 Homework Due:_...

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