Sample Problems - CHEM 1 SAMPLE PROBLEMS Pure...

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CHEM 1 SAMPLE PROBLEMS Pure substance/mixtures: List four differences between compounds and solutions A clear colorless liquid in an open beaker was heated to boiling. The liquid began to boil at 110°C and, as vapors escaped, the boiling temperature gradually increased to 115°C, and all the liquid vaporized. After the liquid vaporized a white residue remained. On the basis of this information, we can say that the material in the beaker was a a) pure compound b) pure element c) pure substance d) homogeneous mixture (or solution) e) heterogenous mixture A solution is an example of a(an) a) homogeneous mixture. b) heterogeneous mixture. c) element. d) compound. e) none of the above. Conservation Laws: The law of conservation of mass states that a) the mass of the products of a reaction equals the mass of the reactants. b) there is no change in mass in a purely physical change. c) the masses of the two reactants in a chemical change must be the same. d) the proportions of the various isotopes of an element are unchangeable. e) the percentage composition of a compound is constant. Element Symbols: Write the correct chemical symbols for the following elements: carbon____________________ sodium_________________________ neon______________________ iron___________________________ potassium__________________ sulfur lithium oxygen nitrogen calcium bromine copper argon magnesium
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mercury Write the correct name for the following elements: P ________________________ Mg __________________________ B ________________________ N ___________________________ Cl _______________________ Be Na Br Cu Ne Pb C K Hg S Fe Sn Definitions: Define the following terms: (remember an example is not a definition) Law of constant composition Element Mole Intrinsic property Law of multiple proportions compound atom empirical formula ion isotope atomic number
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atomic weight Law of conservation of mass physical property orbital - aufbau principle - mole - standing wave - equilibrium - limiting reagent ionization energy molarity Electronegativity sigma bond pi bond formal charge polar bond Scientific Method: Explain the difference between a scientific law and a scientific theory Dalton’s Atomic Theory: List the four assumptions of Dalton's Atomic Theory Explain the Law of Conservation of Mass in terms of Atomic Theory Show how this atomic theory explains the law of definite composition
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Show how Dalton's Atomic Theory explains the law of constant composition. Identify two modifications which would have to be made in the original assumptions of Dalton's Atomic theory so that these assumptions conform to modern theories of the atom. How does Dalton's Atomic Theory explain the changes in a chemical reaction? Dalton's atomic theory consisted of all the following postulates except
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This note was uploaded on 11/16/2011 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

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Sample Problems - CHEM 1 SAMPLE PROBLEMS Pure...

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