Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Question
01 ▶▶ 02 03 >> 04 >> 05 >> Significant Figure Rules Rules All nonzero digits are significant. Zeros that appear between other nonzero digits are always significant. Zeros that appear in front of all of the nonzero digits are called left-end zeros. Left-end zeros are never significant. Zeros that appear after all nonzero digits are called right-end zeros. Right-end zeros in a number that lacks a decimal point are not significant. Right-end zeros in a number with a decimal point are significant. This is true whether the zeros occur before or after the decimal point. 237 has three significant figures. 1.897 has four significant figures. 39,004 has five significant figures. 5.02 has three significant figures. 0.008 has one significant figure. 0.000416 has three significant figures. 140 has two significant figures. 75,210 has four significant Ligures. 620.0 has four significant figures. 19.000 has five significant figures. For multiplication and division problems, the answer should be rounded to the same number of significant figures as the measurement with the least number of significant figures.
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Transcribed Image Text:01 ▶▶ 02 03 >> 04 >> 05 >> Significant Figure Rules Rules All nonzero digits are significant. Zeros that appear between other nonzero digits are always significant. Zeros that appear in front of all of the nonzero digits are called left-end zeros. Left-end zeros are never significant. Zeros that appear after all nonzero digits are called right-end zeros. Right-end zeros in a number that lacks a decimal point are not significant. Right-end zeros in a number with a decimal point are significant. This is true whether the zeros occur before or after the decimal point. 237 has three significant figures. 1.897 has four significant figures. 39,004 has five significant figures. 5.02 has three significant figures. 0.008 has one significant figure. 0.000416 has three significant figures. 140 has two significant figures. 75,210 has four significant Ligures. 620.0 has four significant figures. 19.000 has five significant figures. For multiplication and division problems, the answer should be rounded to the same number of significant figures as the measurement with the least number of significant figures.
YOUR TASK: Setup dimensional analysis to solve t problems. For help, check out this gula Cancel units to prove the setups are correct. Solve the expressions with your calculator and type the numerical answer on the board. ☆ Check your answers with the following #4 If you have 3.58 x 10²4 molecules of carbon dioxide gas (CO₂), approximately how many moles do you have? CD #3 How many molecules are in 4.0 moles of glucose (C6H₁206)? 4.0 molés of glucose x 6.02x10^23/1 mole of glucose = 2.408*10^24 glucose molecules 3.58x10^24 molecules/1 of carbon dioxide/1 mole of co2/6.02x10^23 molecules 5.94 moles of CO2 February 2
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Transcribed Image Text:YOUR TASK: Setup dimensional analysis to solve t problems. For help, check out this gula Cancel units to prove the setups are correct. Solve the expressions with your calculator and type the numerical answer on the board. ☆ Check your answers with the following #4 If you have 3.58 x 10²4 molecules of carbon dioxide gas (CO₂), approximately how many moles do you have? CD #3 How many molecules are in 4.0 moles of glucose (C6H₁206)? 4.0 molés of glucose x 6.02x10^23/1 mole of glucose = 2.408*10^24 glucose molecules 3.58x10^24 molecules/1 of carbon dioxide/1 mole of co2/6.02x10^23 molecules 5.94 moles of CO2 February 2
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