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Chemistry Item 01-06 Which number contains 2 significant figures?   A.  14.00 B.  0.00014 C.  0.0140 D.  140.0 www.upcatreview.com
Chemistry Item 01-06 As mentioned,  significant figures or digits  are those digits in a measurement that are known with certainty and the last digit uncertain or estimated. Some helpful rules/guidelines in determining the number of significant digits are as follows: www.upcatreview.com
Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   A. Non-zero digits are always  SIGNIFICANT.  So the number 5432 has 4 SF. www.upcatreview.com
Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be  considered significant. If zeros are: In between two non-zero digits, they are SIGNIFICANT. Thus  106 has 3 SF. www.upcatreview.com
Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be  considered significant. If zeros are: At the right of a decimal point and a non-zero digit, they are SIGNIFICANT. The example  66.0 has 3 SF. www.upcatreview.com
Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be  considered significant. If zeros are: Used to locate a decimal point or used as place holders, they are NOT SIGNIFICANT. For example 0.132500 - 6 SF 0.00502 - 3 SF www.upcatreview.com
Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be  considered significant. If zeros are: Zeros following a non-zero digit (also called TERMINAL ZEROS) are NOT SIGNIFICANT. So a number like   4000  contains  1 SF.  www.upcatreview.com
Chemistry Item 01-06 ,[object Object],[object Object],[object Object],[object Object],[object Object],www.upcatreview.com
Chemistry Item 01-06 Now, applying these rules to the given choices: A. 14.00  4 SF  - the zeros at the  right of a decimal point and  non-zero digit are significant.  www.upcatreview.com
Chemistry Item 01-06 Now, applying these rules to the given choices: B. 00014 2 SF - all the zeros in this  number are not significant.  www.upcatreview.com
Chemistry Item 01-06 Now, applying these rules to the given choices: C. 0.0140 3 SF - the last zero is  considered significant since it  is at the right of a decimal  point and a non-zero digit www.upcatreview.com
Chemistry Item 01-06 Now, applying these rules to the given choices: D. 140.0 4 SF - the zeros are all  significant (right of a decimal  point and non-zero digit) www.upcatreview.com
Chemistry Item 01-06 Thus the number with only 2 significant digits is  0.00014  ( letter B ) . www.upcatreview.com

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c0106

  • 1. Chemistry Item 01-06 Which number contains 2 significant figures?   A. 14.00 B. 0.00014 C. 0.0140 D. 140.0 www.upcatreview.com
  • 2. Chemistry Item 01-06 As mentioned, significant figures or digits are those digits in a measurement that are known with certainty and the last digit uncertain or estimated. Some helpful rules/guidelines in determining the number of significant digits are as follows: www.upcatreview.com
  • 3. Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   A. Non-zero digits are always SIGNIFICANT. So the number 5432 has 4 SF. www.upcatreview.com
  • 4. Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be considered significant. If zeros are: In between two non-zero digits, they are SIGNIFICANT. Thus 106 has 3 SF. www.upcatreview.com
  • 5. Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be considered significant. If zeros are: At the right of a decimal point and a non-zero digit, they are SIGNIFICANT. The example 66.0 has 3 SF. www.upcatreview.com
  • 6. Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be considered significant. If zeros are: Used to locate a decimal point or used as place holders, they are NOT SIGNIFICANT. For example 0.132500 - 6 SF 0.00502 - 3 SF www.upcatreview.com
  • 7. Chemistry Item 01-06 General Guidelines in Determining Significant Figures (SF)   B. ZEROS may or may not be considered significant. If zeros are: Zeros following a non-zero digit (also called TERMINAL ZEROS) are NOT SIGNIFICANT. So a number like 4000 contains 1 SF. www.upcatreview.com
  • 8.
  • 9. Chemistry Item 01-06 Now, applying these rules to the given choices: A. 14.00 4 SF - the zeros at the right of a decimal point and non-zero digit are significant. www.upcatreview.com
  • 10. Chemistry Item 01-06 Now, applying these rules to the given choices: B. 00014 2 SF - all the zeros in this number are not significant. www.upcatreview.com
  • 11. Chemistry Item 01-06 Now, applying these rules to the given choices: C. 0.0140 3 SF - the last zero is considered significant since it is at the right of a decimal point and a non-zero digit www.upcatreview.com
  • 12. Chemistry Item 01-06 Now, applying these rules to the given choices: D. 140.0 4 SF - the zeros are all significant (right of a decimal point and non-zero digit) www.upcatreview.com
  • 13. Chemistry Item 01-06 Thus the number with only 2 significant digits is 0.00014 ( letter B ) . www.upcatreview.com