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Chemistry Item#5
 

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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    Chemistry Item#5 Chemistry Item#5 Presentation Transcript

    • 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
    • Forgot the formula? www.upcatreview.com
    • It’s not a hopeless case... www.upcatreview.com
    • You could follow two of our tips: www.upcatreview.com
    • First, www.upcatreview.com
    • www.upcatreview.com #31 Remove Extremes For numerical items, remove the extremes ( highest and lowest choice) and choose from the middle values.
    • This tip should only be used when you have no idea on how to solve the problem. www.upcatreview.com
    • 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
    • You’re now left with two choices... www.upcatreview.com
    • Second tip: www.upcatreview.com
    • 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.
    • With the two choices left, www.upcatreview.com
    • 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
    • If you have the knowledge... www.upcatreview.com
    • ...that water is more dense than most alcohols. www.upcatreview.com
    • Perhaps because alcohols evaporate faster than water? www.upcatreview.com
    • And if you also have the knowledge... www.upcatreview.com
    • ...that the density of water is 1 g/ml www.upcatreview.com
    • Then, choice C is also eliminated... www.upcatreview.com
    • ...simply because it’s higher than 1. www.upcatreview.com
    • 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
    • Thus, the answer is... www.upcatreview.com
    • B. 0.79 www.upcatreview.com
    • To verify, www.upcatreview.com
    • Density = mass ÷ volume Density = 63.3 ÷ 80.0 =0.79125 ≈ 0.79 www.upcatreview.com