Week 1 Practice Problems

Week 1 Practice Problems - CHEMISTRY 201X Practice...

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CHEMISTRY 201X August 20-24, 2007 Practice Problems (1) Label each of the following as either a chemical or a physical process: (a) Dissolving sodium chloride in warm water; (b) Adding sodium metal to water resulting in a basic solution; (c) Heating a helium-filled balloon until it pops; (d) Igniting a hydrogen-filled balloon until it explodes. (2) Write down specific definitions for the following terms: (a) Flammable; (b) Corrosive; (c) Pyrophoric; (d) Teratogenic. (3) Discuss reasons why a liquid is considered to be both condensed matter and a fluid . (4) Gold can be hammered into extremely thin sheets called gold leaf . (a) What is the property described by this sentence? (b) If a 206.0 mg piece of gold is hammered into a sheet measuring 75.0 cm long and 30.0 cm wide, what is the average thickness (in cm) of the gold sheet? (HINT: you will need the density of gold to answer this question.) (c) If a gold atom is considered to be spherical with a diameter of 360.0 pm, approximately how many planes of gold atoms are stacked on each other to form this gold leaf?
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This homework help was uploaded on 03/27/2008 for the course CHEM 201 taught by Professor Miller during the Fall '07 term at Iowa State.

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Week 1 Practice Problems - CHEMISTRY 201X Practice...

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