Concept explainers
Write each of the following as a standard number:
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Basic Chemistry
- Determine 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_forwardWhat is density? Give two examples of possible units for density.arrow_forwardUse the figure below to answer the following questions. a. Derive the relationship between C and X. b. If the temperature outside is 22.0C, what is the temperature in units of X? c. Convert 58.0X to units of C, K, and F.arrow_forward
- Write each of the following numbers as “ordinary” decimal numbers. a.6.244103 d.1.771104 b.9.117102 e.5.451102 c.8.299101 ’ f.2.934105arrow_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_forwardThe appropriate number of significant figures in the result of 15.234 x 15.208 is Select one: a. 5 b. 3 C. 2 d. 6 e. 4arrow_forward
- Determine the correct amout of significant figures for each number or operation. Column A 1. 0.002040 2. 15.36 + 2.255 = 17.615 3. 510. 4. 22.2 x 89.01 = 1,976.022 Column B a.2 b.3 c.8 d.4 e.6 f.5 g.1 h.7arrow_forwardConversions: include correct number of significant digits a. 0.20 m to mm b. 2.23 ks to s c. 3.22 Gg to kgarrow_forwardThe result of the calculation (1.0161-0.8711) with correct number of significant figure is a. 0.04700 b. 0.1450 c. 0.145 d. 0.0471arrow_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_forwardWrite the answer with the correct number of significant digits: log(3.456 × 107) The choices are: A. 0.5386 B. 7.538 C. 7.5386 D. 7.54 E. 0.539arrow_forwardSolve the following equations using the correct number of significant figures : 0.005 + 3.5192 + 7.0113 a. 10.53 b. 10.5 c. 10.54 d. 10.535arrow_forward
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