Bio Study Guide free essay sample

List the seven SI base units and the quantities they represent. Meter(length), Kilogram(mass), Seconds(time), Kelvin(temperature), Mole(amt. of substance), Ampere(electric current), Candela(Luminous intensity. ) 8. Identify the SI unit that would be most appropriate for expressing the length of the following. a. width of a gymnasium- meter b. length of a finger-centimeter c. distance between your town and the closest border of the next state -kilometer d. length of a bacterial cell- attometer 9. Identify the SI unit that would be most appropriate for measuring the mass of each of the following objects. a. able- kilograms b. coin- centigrams c. a 250 mL beaker- grams 13. a. Why are the units that are used to express the densities of gases different from those used to express the densities of solids or liquids? Because gases are 1000times less dense than liquids and solids b. Name two units for density. Cubic centimeters and grams c. We will write a custom essay sample on Bio Study Guide or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Why is the temperature at which density is measured usually specified? Density varies with temperature 14. a. Which of the solids listed in Table 4 will float on water? Cork, butter, ice, gasoline, ethyl alcohol, kerosene, turpentine b. Which of the liquids will sink in milk? Mercury, lead, copper, diamond, bone, sucrose 17. Find the density of a material, given that a 5. 03 g sample occupies 3. 24 mL. (Hint: See Sample Problem A. ) 1. 55g/mL 18. What is the mass of a sample of material that has a volume of 55. 1 cm3 and a density of 6. 72 g/cm3? 370. 27g 19. A sample of a substance that has a density of 0. 824 g/mL has a mass of 0. 451 g. Calculate the volume of the sample. 0. 547mL 24. Compare accuracy and precision. Accuracy describes how close a measurement is to the true value of the quantity measured while precision is the exactness of a measurement. 5. a. Write the equation that is used to calculate percentage error. Value(experimental)- Value(acceptedX 100 Value(accepted) 29. Round each of the following measurements to the number of significant figures indicated. a. 67. 029 g to three significant figures- 67. 0g b. 0. 15 L to one significant figure-0. 2L c. 52. 8005 mg to five significant figures- 52. 801mg d. 3. 174 97 mol to three significant fi gures-3. 17mol 30. State the rules governing the number of significant figures that result from each of the following operations. a. ddition and subtraction- When adding or subtracting decimals, the answer must have the same number of digits to the right of the decimal point as there are in the measurement having the fewest digits to the right of the decimal point. b. multiplication and division-3SF 35. A student measures the mass of a sample as 9. 67 g. Calculate the percentage error, given that the correct mass is 9. 82 g. (Hint: See Sample Problem C. ) 36. A handbook gives the density of calcium as 1. 54 g/cm3. Based on lab measurements, what is the percentage error of a density calculation of 1. 25 g/cm3? 37. What is the percentage error of a length measurement of 0. 29 cm if the correct value is 0. 225 cm? 38. How many significant figures are in each of the following measurements? (Hint: See Sample Problem D. ) a. 0. 4004 mL- 4SF b. 6000 g-1SF c. 1. 000 30 km-6SF d. 400. Mm- 4S F 39. Calculate the sum of 6. 078 g and 0. 3329 g. 40. Subtract 7. 11 cm from 8. 2 cm. (Hint: See Sample Problem E. ) 41. What is the product of 0. 8102 m and 3. 44 m? 42. Divide 94. 20 g by 3. 167 22 Pg. 63 1. Which of the following masses is the largest? A. 0. 200 g C. 20. 0 mg B. 0. 020 kg D. 2000 ? g 2. Which of the following measurements contains three significant figures? A. 200 mL C. 20. 2 mL B. 0. 02 mL D. 200. 0 mL 3. A theory differs from a hypothesis in that a theory A. cannot be disproved. B. always leads to the formation of a law. C. has been subjected to experimental testing. D. represents an educated guess. 4. All measurements in science A. must be expressed in scientific notation. B. have some degree of uncertainty. C. are both accurate and precise. D. must include only those digits that are known with certainty. 5. When numbers are multiplied or divided, the answer can have no more A. significant figures than are in the measurement that has the smallest number of significant figures. B. ignificant figures than are in the measurement that has the largest number of significant figures. C. digits to the right of the decimal point than are in the measurement that has the smallest number of digits to the right of the decimal point. D. digits to the right of the decimal point than are in the measurement that has the largest number of digits to the right of the decimal point. 6. Which of the following is not part of the scientific method? A. making measurements B. introducing bias C. making an educated guess D. analyzing data 7. The accuracy of a measurement A. is how close it is to the true value. B. does not depend on the instrument used to measure the object. C. indicates that the measurement is also precise. D. is something that scientists rarely achieve. 12. You have decided to test the effects of five garden fertilizers by applying some of each to separate rows of radishes. What is the variable you are testing? What factors should you control? How will you measure and analyze the results? Variable- effects of five garden fertilizers, I should control the amount of sunlight and the amount of water given, I will measure the results by measuring the length of the radishes over specified periods of time.