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Significant Digits and Metric Conversions!

Chemistry Unit 4 Review Part 1. Significant Digits and Metric Conversions!. Question 1 - 10. How many significant Digits are in this number: 1422. Answer 1 – 10. 4! All numbers present are between 1 and 9. Question 1 - 20. How many significant digits are in the following number? 200.

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Significant Digits and Metric Conversions!

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  1. Chemistry Unit 4 Review Part 1 Significant Digits and Metric Conversions!

  2. Question 1 - 10 • How many significant Digits are in this number: 1422

  3. Answer 1 – 10 • 4! • All numbers present are between 1 and 9.

  4. Question 1 - 20 • How many significant digits are in the following number? 200

  5. Answer 1 – 20 • There is only 1! • The zeros don’t count because the number doesn’t have a decimal place in it!

  6. Question 1 - 30 • How many significant ZEROs are in the following number? 0.0030050

  7. Answer 1 – 30 • 3! • The captures zeros and the trailing zero are the only ones that are significant!

  8. Question 1 - 40 • What is the length of the following green bar?

  9. Answer 1 – 40 • 1.25! • The 1 and the 2 are in concrete, the 5 can be a different number that is reasonable.

  10. Question 1 - 50 • How many zeros in the following number are NOT significant? .0005050090

  11. Answer 1 – 50 • 3! • Only the zeros in the beginning of the number do not count!

  12. Question 2 - 10 • Convert the following: 254.3 grams to Kilograms

  13. Answer 2 – 10 • .2543 Kg • The number will get smaller because the unit gets bigger!

  14. Question 2 - 20 • How many milliliters are in the following number? 0.0367 Liters

  15. Answer 2 – 20 • 36.7 mL • The number gets bigger because the unit gets smaller!

  16. Question 2 - 30 • Which weighs more? 4.25 grams of Au or 425 mg of Au

  17. Answer 2 – 30 • 4.25 grams does! • Convert milligrams to grams and you get .425 mg! That is less than 4.25 grams!

  18. Question 2 - 40 • What is the metric prefix that correspond to the following quantity? 10-2

  19. Answer 2 – 40 • Centi!

  20. Question 2 - 50 • How many mL are in the following number? 87 DL

  21. Answer 2 – 50 • There are 870,000 mL! • KHD*dcm

  22. Question 3 - 10 • What is the answer to the following addition problem? 212.2 + 26.7 + 402.09 =

  23. Answer 3 – 10 • Addition, so look for least # of decimal places! • 641.0

  24. Question 3 - 20 • What is the answer to the following addition problem? 2.01x102 + 3.014x103

  25. Answer 3 – 20 • 3215 • You have to take the numbers out of scientific notation to look at decimal places!

  26. Question 3 - 30 • What is the answer to the following problem? 52.331 + 26.01 – 0.9981

  27. Answer 3 – 30 • 77.34 • Watch number of decimal places here! Add and subtract carry least number of decimal places to the answer.

  28. Question 3 - 40 • How many digits after the decimal point should be reported when the following calculation is performed? 199.0354 + 43.09 + 121.2

  29. Answer 3 – 40 • There should only be 1 decimal place in this answer!

  30. Question 3 - 50 • How many digits after the decimal place should be reported when the following calculation is performed? 10,434 – 9.3344

  31. Answer 3 – 50 • There will not be any decimal places in this number! 

  32. Question 4 - 10 • What is the answer to the following division problem? 12.011 / 6.022x1023

  33. Answer 4 – 10 • 1.995x10-23 • We need to look at number of significant digits in the numbers of the problem—least number determines answers sig figs!

  34. Question 4 - 20 • What is the answer to the following problem? (4.031)(0.082068)(373.1)/.995

  35. Answer 4 – 20 • 124 • Remember least # of sig figs will be reported in the answer!

  36. Question 4 - 30 • The answer to the following question should be written with how many significant digits? 2.3733x102/ 343

  37. Answer 4 – 30 • 3!

  38. Question 4 - 40 • When the following calculation is performed, the answer should be reported with how many significant digits? .0043*.0821*298

  39. Answer 4 – 40 • 2! • Remember least goes! 

  40. Question 4 - 50 • What is the answer to the following problem? (6.1982x10-4)2

  41. Answer 4 – 50 • 3.8418x10-7 • Or 3.8000x10 -7

  42. Question 5 - 10 • What is the answer to the following problem? (2.0944+.0003233*12.22)/7.001

  43. Answer 5 – 10 • .2997 • Remember your order of operations! • Please Excuse My Dear Aunt Sally!

  44. Question 5 - 20 • What is the answer to the following problem? [(1.42x102)+(1.021x103)]/3.1x10-1

  45. Answer 5 – 20 • 3.8x103

  46. Question 5 - 30 • Consider the following numbers 23.68 and 4.12. • The sum of these numbers has how any significant digits? • The product of these numbers has how many significant digits?

  47. Answer 5 – 30 • Sum has 4 • Product has 3

  48. Question 5 - 40 • You pour the water from these beakers into a separate container. What is the volume with the correct number of significant digits.

  49. Answer 5 – 40 • Your answer should range from 81 to 82 mL without any decimals!

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