Chemistry Item#5
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Chemistry Item#5

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Item#5 of the Chemistry Diagnostic Test (c)2007 by Review Masters League, Inc.

Item#5 of the Chemistry Diagnostic Test (c)2007 by Review Masters League, Inc.

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  • 1. Chemistry Item #5
    • What is the density (g /mL) of a sample of ethyl alcohol if a 63.3 g sample occupies
    • 80.0 mL?
          • 0.079
          • 0.79
          • 1.26
          • 12.
    www.upcatreview.com
  • 2. Forgot the formula? www.upcatreview.com
  • 3. It’s not a hopeless case... www.upcatreview.com
  • 4. You could follow two of our tips: www.upcatreview.com
  • 5. First, www.upcatreview.com
  • 6. www.upcatreview.com #31 Remove Extremes For numerical items, remove the extremes ( highest and lowest choice) and choose from the middle values.
  • 7. This tip should only be used when you have no idea on how to solve the problem. www.upcatreview.com
  • 8. Chemistry Item #5
    • What is the density (g /mL) of a sample of ethyl alcohol if a 63.3 g sample occupies
    • 80.0 mL?
          • 0.079
          • 0.79
          • 1.26
          • 12.6
    www.upcatreview.com
  • 9. You’re now left with two choices... www.upcatreview.com
  • 10. Second tip: www.upcatreview.com
  • 11. www.upcatreview.com #25 Educated Guess If you need to make a guess then it should be an educated guess . First, eliminate the answers that you know are wrong , then try your best to establish a basis for your choice.
  • 12. With the two choices left, www.upcatreview.com
  • 13. Chemistry Item #5
    • What is the density (g /mL) of a sample of ethyl alcohol if a 63.3 g sample occupies
    • 80.0 mL?
          • 0.079
          • 0.79
          • 1.26
          • 12.6
    www.upcatreview.com
  • 14. If you have the knowledge... www.upcatreview.com
  • 15. ...that water is more dense than most alcohols. www.upcatreview.com
  • 16. Perhaps because alcohols evaporate faster than water? www.upcatreview.com
  • 17. And if you also have the knowledge... www.upcatreview.com
  • 18. ...that the density of water is 1 g/ml www.upcatreview.com
  • 19. Then, choice C is also eliminated... www.upcatreview.com
  • 20. ...simply because it’s higher than 1. www.upcatreview.com
  • 21. Chemistry Item #5
    • What is the density (g /mL) of a sample of ethyl alcohol if a 63.3 g sample occupies
    • 80.0 mL?
          • 0.079
          • 0.79
          • 1.26
          • 12.6
    www.upcatreview.com
  • 22. Thus, the answer is... www.upcatreview.com
  • 23. B. 0.79 www.upcatreview.com
  • 24. To verify, www.upcatreview.com
  • 25. Density = mass ÷ volume Density = 63.3 ÷ 80.0 =0.79125 ≈ 0.79 www.upcatreview.com