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Express the number 0.0000027 in standard exponential form. (Points : 4)
( )0.027 × 10-4
( )0.27 × 10-3
( )2.7 × 106
( )2.7 × 10-6
( )None of the above

16. Which component of the atom has no charge? (Points : 4)
( )electrons
( )protons
( )neutrons
( )all components have a charge







Which of the following equations is balanced for the reaction?
HF + SiO2 --> SiF4 + H2O (Points : 4)
( )4HF + SiO2 --> SiF4 + H2O
( )8HF + 2SiO2 --> 2SiF4 + 3H2O
( )2HF + SiO2 --> SiF4 + H2O
( )4HF + SiO2 --> SiF4 + 2H2O

22. Which of the following equations is properly balanced, including having the smallest whole number coefficients? (Points : 4)
( )2BaCl2 + 2Na2SO4 --> 2BaSO4 + 4NaCl
( )2Na + 4Cl2 --> 2NaCl
( )2Na + 2H2O --> 2NaOH + H2
( )2HCl + Mg --> 2MgCl2 + H2

23. How many molecules of hydrogen chloride (HCl) are in 0.500 moles? (Points : 4)
( )18.06 × 1023 molecules
( )6.02 × 1023 molecules
( )3.01 × 1023 molecules
( )12.0 × 1023 molecules

24. Lucite is 71.4% carbon, 9.59% hydrogen, and 19.01% oxygen. What is the empirical formula for Lucite? (Points : 4)
( )C5H8O
( )C89HO31
( )C7HO2
( )The formula cannot be determined with only this information.

25. Which of the following equations accurately represents the calculation needed to determine the number of grams of FeCl3 produced from 4.00 moles of Cl2?

3Cl2(g) + 2FeI2(g) --> 2FeCl3(g) + 2I2(g) (Points : 4)
( )
( )
( )
( )



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