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

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

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

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

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