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Using scientific notation, the number would be: 1.46 X 1011 To write a number in scientific notation for 146,000,000,000: Step I: place the decimal after the first digit and drop all the zeroes. 000,000,000 Step 2: count the number of places from the decimal to the end of the number. For example: 1.46000000000Count.1234567891011There are 11 places after the decimal point; therefore the exponent is 11. Thus 146,000,000,000 becomes 1.46 x 1011. 152,000,000 is 1.52 X 108 Exponents in scientific notation are often expressed in different ways. For example, 146,000,000,000 can also be written as: 1.46E + 11 or as 1.46 X 10^11 A similar approach is used for small numbers (< 1), which will have a negative exponent. A millionth of a second is: 0.000001 sec. = 1.0 x 10-6 (or 1.0E -6 or 1.0^ -6) Thus, with small numbers, you count from the decimal the number of zeroes until you reach the first non-zero number. 0.00000123 sec. = 1.23 X 1O-6 Exercise: Scientific Notation Convert the following numbers into or; from scientific notation: 1. 678,950,000,000 =_________________ 2. 1,000,000,000,000 =_________________ 3. .00000004567 =_________________ 4. 5,689,000,000 =_________________ 5. 8923 =_________________ 6. .000000045678963 = _______________ 7. 2.223 X 10-9=-_________________ 8. 3.19E+ 12 =____________________ 9. 4.444^ -4 =__________________ 10. 7.47 X 1013 =________________ II- CALCULATING PERCENT CHANGE Environmental scientists often analyze trends. A popular approach to communicating these trends is percentage increase/decrease over time. In calculating percentage of change (whether an increase or a decrease), you are concerned with the difference between two numbers and how much of the first number added to or subtracted from the first number will produce the second number. The three steps to calculate a percentage are: 1. Subtract 2. Divide 3. Multiply Subtract: New number - original number = change Divide: by original number Multiply: by 100 Thus, the basic formula is simple:  Percent increases and decreases are calculated with respect to the value before the change took place the original number. A. In 2004, the level of acetone in the river was 100 parts per million (ppm). In 2004, the level increased by 12 ppm. What is the percentage increase in acetone? 12/100 = .12 X 100 = 12% B. In 2000, the level of ammonia was 63 ppm. In 2004, the level is 112 ppm. What is the percentage of increase since 2000? Step 1: Determine the amount of change. 112 -63 = 49 Step 2: Divide the change by the original number, then multiply by 100. 49/63 = .777 X 100 = 77.7% C. Last month, the level of hexachlorobenzene had decreased by 8 ppm. If the level is now 47 ppm, by what percentage did the level of hexachlorobenzene decrease? The amount of change is 8, therefore the original amount is 47 + 8 = 55. 8/55 = .145 X 100 = 14.5% D. A utility's operating costs for its electrostatic precipitator was the following: 2001 = $345,000 2002 = $325,000 2003 = $345,000 What were the annual percentage changes? 2001 to 2002: ($325,000 - $345,000)/$345,000 X 100 = -5.79% 2002 to 2003: ($345,000 - $325,000)/$325,000 X 100 = 6.15% Exercise: Calculating Percentage Changes Solve the following. 1. 234.98 to 324.77 =____________% change 2. 324.77 to 234.98 =____________% change 3. 7.14 X 107 to 8.47 X 108 =____________% change 4. 100 increases by 300% =____________ 5. 756 declines by 100% =____________ 6. 756 increases by 100% =____________ 7. A utility's total pollution control costs are broken down as follows: Air pollution control = $234,000 Wastewater treatment = $167,000 Solid waste = $45,000 Hazardous waste = $12,000 What percentage does the company spend for each? Air pollution control =_________% Wastewater treatment =________% Solid waste =_________% Hazardous waste =__________% 8. The company's managers want to budget sufficient money for next year. Assuming that costs will increase by 2.4%, what will the costs be for next year for each category? Air pollution control = $_________ Wastewater treatment = $__________ Solid waste = $_________ Hazardous waste = $_________ 9. An environmental scientist has the following data on mercury concentrations in small mouth bass (Micropterus dolomieu) sampled from a pond. What is the annual mean concentration for each year? What is the mean for all three years? 2002200320047.2 X 1042.1 X 1046.4 x F1046.5 x 1044.1 x 1047.7 x 1047.1 X 1047.0 X 1045.2 x 1046.6 x 1047.3 x 1047.2 x 1046.9 x 1045.9 x 1047.1 x 1047.1 x 1045.0 x 1049.4 x 1047.5 x 1045.1 x 1042.1 x 104 10. What is the percentage difference between 2002 and 2003 and between 2003 and 2004 based on the annual, average mercury concentration? 11. Why is it important for a member of an environmentally literate society to be able to understand scientific notation and percentages? 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