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Round off each of the following calculator answers to three significant figures:
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Basic Chemistry
- To how many significant figures should each answer be rounded? (6.626x 10-34 J . s) (2.9979x 10% m/s) equation A: = 4.483992189616 x 10-19 J (unrounded) 4.430 x 10-7 m After rounding, the answer to equation A should have O 1 significant figure. O 4 significant figures. O 2 significant figures. O 3 significant figures. O 5 significant figures. (6.022x 1023 atoms/mol) (0.653 g) 20.18 g/mol = 1.949 x 1022 atoms (unrounded) equation B: After rounding, the answer to equation B should havearrow_forward1. In which of the following pairs do both numbers contain the same number of significant figures? a. 2.0500 m and 0.0205 b. 600.0 K and 60 K c. 0.000 75 s and 75 000 s d. 6.240 L and 6.240 X 10 -² Larrow_forwardConversions: include the correct number of significant digits and follow the format included in the image. a. 0.20 m to mm b. 2.23 ks to s c. 78.9 mg to garrow_forward
- Complete each row of the table below by filling in the missing prefix or missing exponent. 1 ds 10 S. 1. -3 10 IS 1ns 10 !! -2 10 S I Don't Kngyw Suhmitarrow_forwardAfter studying your printed calibration graph, answer the following questions. a. Which variable is plotted on the y-axis? b. Which variable is plotted on the x-axis? c. On which axis is the independent variable plotted? d. On which axis is the dependent variable plotted? The proper equation for the graph is y = 6.1x-0.0014 Als vs Can Marrow_forwardSolve each problem, and express the answer in scientific notation.a. (4 × 1 0 2) × (1 × 1 0 8) c. (6 × 1 0 2) ÷ (2 × 1 0 1)b. (2 × 1 0 -4) × (3 × 1 0 2) d. (8 × 1 0 4) ÷ (4 × 1 0 1)arrow_forward
- Convert 234.0 x10^-4 to the proper exponential notation following thr rules of significant figures. A. 2.340x10^2 B. 2.340x10^ 0 C. 2.340x10^-2 D. 2.34x10 ^ 3 E. 2.340x10^ 3 F. 2.340x10^-1 G. 2.34x10^-2 H. 2.34x10^2 I. 2.34x10 ^-3 J. 2.340x10^ -3 K. 2. 349x10^1 L. 2.340arrow_forwardWhat is the mass (g) of 10.0 mL cottonseed oil? The density of cottonseed oil is 0.926 g/mL at 20.0Carrow_forwardDetermine whether each statement that follows is true or false: a The SI system includes metric units. b If two quantities are expressed in an equivalency, they are directly proportional to each other. c The scientific notation form of a number smaller than 1 has a positive exponent. d In changing a number in scientific notation whose coefficient is not between 1 and 10 to standard scientific notation, the exponent becomes smaller if the decimal in the coefficient is moved to the right. e There are 1000 kilounits in a unit. f There are 10 milliunits in a centiunit g There are 1000 milliliters in a cubic centimeter. h The mass of an object is independent of its location in the universe. i Celsius degrees are smaller than Fahrenheit degrees. j The uncertain digit is the last digit written when a number is expressed properly in significant figures. k The quantity 76.2 g means the same as 76.200 g. l The number of significant figures in a sum may be more than the number of significant figures in any of the quantities added. m The number of significant figures in a difference may be fewer than the number of significant figures in any of the quantities subtracted. n The number of significant figures in a product may be more than the number of significant figures in any of the quantities multiplied. o The process of analysis of a problem statement includes describing the properties of the given and wanted quantities. p If the quantity in the answer to a problem is familiar, it is not necessary to check to make sure the answer is reasonable. q Conversion factors can be used to change from one unit to another only when the quantities are directly proportional. r When you are learning chemistry, you should check the solution to each problem you solve at two levels: 1 is the value reasonable? 2 what new knowledge or skill did I obtain or improve? s There is no advantage to using units in a problem that is solved by algebra. t A Fahrenheit temperature can be changed to a Celsius temperature by multiplying by a conversion factor.arrow_forward
- A children's pain relief elixir contains 80. mg acetaminophen per 0.50 teaspoon. The dosage recommended for a child who weighs between 24 and 35 lb is 1.5 teaspoons. What is the range of acetaminophen dosages, expressed in mg acetaminophen/kg body weight, for children who weigh between 24 and 35 lb?arrow_forwardWhen a large or small number is written in standard scientific notation, the number is expressed as the product of a number between 1 and 10, multiplied by the appropriate power of 10. For each of the following numbers, indicate what power of 10 would be appropriate when expressing the numbers in standard scientific notation. a. 84,961,306 b. 0.4870 c. 0.000033812 d. 3,890,406,000,000arrow_forwardSay you live in a climate where the temperature ranges from 100F to 20F and you want to define a new temperature scale, YS (YS is the Your Scale temperature scale), which defines this range as 0.0YS to 100.0YS. a Come up with an equation that would allow you to convert between F and YS. b Using your equation, what would be the temperature in F if it were 6.6YS?arrow_forward
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