CHEM 1364 Test 1 Fall 1999
1. A(n) _____________ can be considered an intermediate phase of matter, as it shares some properties with each of the other two phases of matter.
2. A(n) ________________ can be separated into it's components by physical means.
3. A(n) ________________ change involves the rearrangement of atoms.
4. Volume is a _________________ (base/derived) unit of measure in the SI system.
5. The ________________ of an atom contains all of the protons and neutrons associated with that isotope.
6. The ______________ ray tube gave the first empirical evidence for the existence of electrons.
7. The _____________ number for an isotope indicates the number of protons that isotope has.
8. A(n) _______________ formula indicates the number of each type of atom in a compound.
9. ___________________ elements are those for which we can predict the ionic charge.
10. __________________ is the term that describes the relationship among the species in a balanced chemical equation.
11. When a chemical equation is balanced, there are the same number and type of __________ on each side of the arrow.
12. __________________ is the rapid, exothermic reaction of a substance with molecular oxygen.
13. A(n) __________________ reaction is characterized by a single compound forming two or more species.
14. The units you should immediately think of when you hear the term 'molecular weight' are _________ per __________.
15. The __________________ reactant in a chemical reaction is the species that is completely consumed.
16. Perform the following conversions:
a) 2.54 GHz to Hz
b) 125 meters to yards (2.54 cm = 1 in)
c) The volume of 12.0 oz of gold (1 lb = 453.6 g; dAu = 19.3 g/mL)
17. Write the formula for the following chemical compounds:
a) silicon tetrafluoride _____________________________
b) copper(II) acetate _____________________________
c) iron(III) oxide _____________________________
d) gallium sulfate _____________________________
e) dihydrogen monoxide _____________________________
18. Balance the following chemical equations:
Sn + Cl2 -> SnCl4
C3H8O + O2 -> CO2 + H2O
N2 + H2 -> NH3
19. Motrin ® is a commonly-used over the counter pain reliever, for which the active ingredient contains only carbon, hydrogen, and oxygen. Combustion analysis of 1.00g of the compound yielded 2.77 g of CO2 and 0.787 g of H2O. What is the empirical formula of the active ingredient in Motrin ®?
20. Calculate the theoretical and actual yield when 3.75 g of P4 reacts with 4.32 g of O2 to form 7.25 g of P4O10. [HINT: Write the balanced chemical equation!]