CHEM 1364 Test 1 Fall 1997

1. A(n) _______________change causes a substance to rearrange it's atoms to form a new substance or substances.

2. The three parts to any measurement are magnitude, error, and ___________.

3. For a measurement, we use __________________ figures to indicate the error involved in the measurement.

4. ________________ motion occurs because of the random, continuous movement of particles.

5. __________________ determined the charge to mass (e/m) ratio for an electron.

6. _________________ determined, through his now famous Oil Drop Experiment, the charge of an electron.

7. _________________ determined that the majority of the mass and positive charge for an atom was isolated in a very small area now called the nucleus.

8. _______________ are atoms of the same element with differing numbers of neutrons, and therefore different masses.

9. A(n) ______________ compound is held together by the electrostatic forces that allow opposite charges to attract.

10. The Law of Conservation of _______________ allows us to determine that we should have the same number and type of atoms on both sides of a balanced chemical equation.

11. A(n) ______________ is simply a (very large) number of objects that is also the basis for the SI base unit for the 'amount of substance.'

12. The ________________________ for a compound is simply the sum of the masses of the atoms that make up the compound.

13. A(n) solution is a(n) _________________ mixture.

14. The ________________ for a solution is expressed as the moles of solute per liter of solution.

15. _____________________ is the process of adding more solvent to a solution.

16. (15) Perform the following conversions:

a) 100.0 yards to cm (2.54 cm = 1 in)

b) 75.0 mi/hr to m/s (2.54 cm = 1 in)

c) 427 in³ to L (2.54 cm = 1 in)

17. (15) Write the name for the following chemical compounds:

a) AlCl₃ _____________________________

b) CaCO₃ _____________________________

c) CuSO₄ _____________________________

d) Hg₂S _____________________________

e) N₂O₄ _____________________________

18. (15) Calculate the molar mass for the following compounds:

a) CaCO₃

b) Hg₂S

c) N₂O₄

19. (15) Ibuprofen is a commonly-used over the counter pain reliever. An elemental analysis of ibuprofen showed the compound to be 75.7%C, 8.8%H, and 15.5%O. Mass spectrometric measurement of the substance gave a molecular weight of 206.3g/mol. Calculate the empirical formula and the molecular formula for ibuprofen.

20. (10) Calculate the molarity of a solution of acetic acid (C₂H₅OH) if 5.00 grams of acetic acid was dissolved in enough solvent to give a final volume of 100.0 mL.

EXTRA CREDIT (10 points) What is the name of your CHEM 1364 instructor?

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