Reading Questions Page 57, 59, And 60

Ledgerwood Period D Chem 1H

Eamon Barkhordarian 9/02/09

Homework #6 Reading Questions pg. 57, 59, and 60 I. Page 57 1. Student A’s average of data was 8.33333. The average of student B was 8.4. Student B’s data is closer to the actual deinsity of copper. Not only that, but student B also got consistently densities of 8 (not counting the decimals). Student A’s data ranged from 7 to 9, being not only inaccurate, but very un precise. 2. a. 4 sig figs b. 2 sig figs c. 6 sig figs d. 1 sig figs e. 4 sig figs 3. 2.8 4. a. 52.13g + 1.7502g = 53.89g b. 12m x 6.41 m = 77 m2 c. 16.25 g/5.1442 mL = 3.16 5. a.

b.

Ledgerwood Period D Chem 1H

Eamon Barkhordarian 9/02/09

c.

d. 6. a. 5.6 x 10 5 b. 3.34 x 10 4 c. 4.120 x 10 -4 7. a. 215.6 – 110.4 = 105.2 g. b. 105.2/114=0.922 g/cm3 8.

9. Directly proportional means if you increase one side of the equation, the other side must also increase by the same amount to balance it out. Inversely means the opposite of that. When one value goes faster, the other one must decrease to balance out speed and time for example. 10. 4 significant figures. Whenever you are doing a problem with 2 or more sig figs, the final answer must have the same number of the digits as the measurement with the fewest to the right.

Ledgerwood Period D Chem 1H II. 59

Eamon Barkhordarian 9/02/09

24. Accuracy is how close your data compares with the actual correct answer you are experimenting for. Precision is how consistent your answers are with one another. 25. a. value experimental-value accepted/value accepted x 100 b. If the accepted value is greater than the experimental value. 26. You add up the values and divide it by the number of values you are adding. 28. A non calibrated graduated cylinder can affect your data negatively. It will make your data inaccurate and you significant figures will be wrong. 29. a.67.0 b. 0. c.52.801 d. 3.17