Unit 1 Study Guide Name Date Scientific Method Notes

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1 Unit 1 Study Guide Name Date Scientific Methd Ntes 1) What is the difference between an bservatin and an inference? 2) What are the tw types f bservatins? Give examples f each type. 3) Define the fllwing: Independent variable: Dependent variable: Cntrl variable: Cntrl grup: Accuracy: Precisin: 4) What makes a measurement tl mre accurate? 5) Identify the variables in the fllwing experiments Three redwd trees are kept at different humidity levels inside a greenhuse fr 12 weeks. One tree is left utside in nrmal cnditins. Height f the tree is measured nce a week. IV: DV: CG: Cnstants: A student wanted t test hw the mass f a paper airplane affected the distance it wuld fly. Paper clips were added befre each test flight. As each paper clip was added, the plane was tested t determine hw far it wuld fly. IV: CG: DV: Cnstants: 6) Measure the fllwing amunts t the crrect number f significant figures

2 7) Backgrund: Clams were placed int varius temperatures f water. Use the infrmatin in the data table belw in rder t create a prper scientific graph and t answer the crrespnding questins. Water Temperature ( C) Number f Develping Clams What is the dependent variable? What is the independent variable? What is the ptimum temperature fr clam develpment? What is the mean number f clams per sample? Apprximately hw many clams wuld be develping in 10 degree Celsius water?

3 8) Backgrund: The pie chart shws the apprximate percentages teenagers spend ding varius activities in a day. Use the infrmatin in the pie chart t answer the questins belw. What percent f the day is spent watching TV? Hw many hurs are spent sleeping? What activity takes up the least amunt f time? What activity takes up a quarter f the day? What tw activities take up 50% f the day? What tw activities take up 25% f the day? 9) Bar Graph What is the dependent variable? _ Des the price per bushel always increase with demand? What is the quantity demanded when the price is $5 per bushel? What is the price per bushel when the quantity demanded is 80? Set A: Determine the number f significant digits in each number AND write the number in scientific ntatin , ,

4 Set B: Rund t the number f significant digits indicated t 1 sig. fig t 3 sig. fig t 2 sig.fig , 384 t 2 sig. fig t 3 sig. fig t 3 sig. fig t 1 sig. fig t 3 sig. fig ,066 t 1 sig. fig t 4 sig. fig. Dimensinal Analysis 1) A runner cmpeted in a 5-mile run. Hw many yards did she run? 2) In the Tur de France, cyclists ride 3,653.6 km in 20 days. Hw many miles d they g? [Hint: watch fr unimprtant infrmatin!] 3) After a nice meal, perhaps yu d finish it ff with a pund (1.00 lb) cake fr dessert. What wuld the name f this cake be in grams? 4) In the US milk is sld by the galln, while in Denmark it is sld by the liter. Hw many liters f milk wuld yu need t equal ne galln? 5) If yu g t schl fr 180 days each schl year and each schl day is 7 hurs lng, hw many hurs are spent in schl in ne schl year? 6) 40 ml t L 7) 5400 L t kl

5 8) 52 mg t g 9) 63m t km 10) 74 cm t mm 11) 835 mg t kg 12) 6.42 m t mm 13) 25 Mg t g 14) If Earth s diameter is 7,917.5 miles, hw many megameters wuld that be equivalent t? Percent Errr 1) A student measures the length f a sheet f paper and finds that it is 27 cm lng. The label n the package indicates that the paper length is 28 cm. Calculate the percentage errr in the measurement. 2) A student measures the width a sheet f paper and finds that the width is 22 cm. The label n the package indicates than the paper width is 21 cm. Calculate the percentage errr in the measurement.

6 3) The mass r a rubber stpper is fund t be 6 g. The science teacher tells the class t use 7.5 g as the standard value fr the rubber stpper. What is the percentage errr in the measurement? 4) A student measures the mass f an U.S. nickel and determines that the value is 48.0 mg. The U.S. Mint indicates that all U.S. nickels shuld mass 50.0 mg. What is the percentage errr f the student s measurement? 5) A student purs the cntents f a 2.0-liter bttle f sda int a large graduate cylinder. She finds that there was ml in the bttle. What was the percentage errr made when the bttle was filled at the bttling plant? 6) Mr. Smith has asked a student t help cut sme wd int 12.5-cm pieces fr a prject. The student cuts each piece t a length f 14.7 cm. What is the percentage errr in the student s measurement? 7) Mrs. Ravili is trying ut a new recipe fr Hme and Careers class. This recipe calls fr 2 teaspns f vanilla extract. Mrs. Ravili s student assistant puts in 2 teaspns and s des Mrs. Ravili. What is the percentage errr in the measurement f vanilla extract fr this recipe? 8) The area f Mr. Bscaren s classrm was measured by students and fund t be square meters. Accrding t measurements made frm the architect s plans, the rm s actual area is 78.5 square meters. What is the errr in the students measurement? 9) The pwer utput f a Cadillac autmbile engine is listed as kw (kilwatts). When this value was check by an aut mechanic, the utput was nly kw. What was the percentage difference in the utput cmpared t the standard value?

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