VOORHEES SCIENCE



Name: _____________________________________________________________________Unit 2 - MeasurementsDateAgendaHomeworkThurs9/28D-labIntroduction to Chemistry testStart homeworkWatch video and answer questionsin worksheet #1 of packet Mon10/2BMrs. Kerr at stream tripWorksheet #2POGIL: Significant Digits and MeasurementFinish Extension QuestionsTues10/3CReview POGILRules for significant figures (notes in class)Start significant figures worksheet #3Finish worksheet #3Wed10/4D- lab-Review significant figures, scientific notation, and factor labelingConversion Notes in class-Begin worksheet #4Complete worksheet #4Fri10/6BReview Unit-Worksheet #4Complete Review SheetStudy for questTues10/10CQuest - MeasurementWorksheet #1Crash Course Chemistry #2 – Unit Conversion & Significant FiguresAnswer the questions below as you follow along with the video ()Give an example of a base unit.Give an example of a derived unit. What makes a derived unit different from a base unit?What is an exact number? Give an example.What are the two things measured numbers tell you?What are significant figures?What is the rule for addition & subtraction with significant figures?What is the rule for multiplication and significant figures?Answer and round to the correct sig figs.12.72 + 6.4796.578 x 12.1“Keep track of units” by crossing out labels as they appear in both the numerator and denominator.mi ????x ????hr ????x ????min ????x ????m ????x ????cm=hr ?????min ????????????s ??????????????mi ???????????mm ????x ????s ?????x ????s ?????x ????ft ????=s2 ?????????min ???????min ????????mg ?????x ????1 ?????x ?????1 ?????x ?????kg ?????=????cm ??????????cm ????????????gWORKSHEET # 2 POGIL ACITIVITYClass Notes: Significant Figures and Scientific NotationWorksheet (s) #3Review Significant Figures, Scientific Notation and Factor Labeling IState how many significant figures are in the following.1.16.30_______2.0.0706_______3.105000_______4.12.03_______5.1400_______IIRound off to the indicated number of significant figures.11. ?4751.9 to 3 sf's_______16.0.06372 to 3 sf's_______12. ?4751.9 to 2 sf's_______17.0.06372 to 2 sf's_______13. ?808.57 to 4 sf's_______18.808.57 to 2 sf's_______III ?Perform the following operations, expressing your answers to the proper number of significant figures. Write the calculator answer first, then the rounded answer.Calculator AnswerAnswer Rounded to SF21. ?12 ?x ?4.91765_____________________22. ?8.07 x ?45.9_____________________24. ??4.82 ______________________???????1.33725. ?0.00195_____________________??????????0.39IV Write the number of significant digits on the first blank and the number in scientific notation with the correct number of significant digits on the second blank.1.36, 000_________________________2.0.230_________________________3.0.000934_________________________4.9,001,000_________________________V. Write the number of significant digits on the first blank and the number in standard form with the correct number of significant digits on the second blank.1.8.500 x 105_________________________2.3.03 ?x 103_________________________3.7.000 x 10-2_________________________4.6.205 x 10-1_________________________Class Notes/Sample Problems- Unit ConversionsWorksheet #4?MAKE SURE TO SHOW ALL WORK FOR EACH PROBLEM1in = 2.54cmMAKE SURE THE UNITS ACCOMPANY YOUR ANSWER1ft = 12 inchesCIRCLE THE ANSWER AT THE END OF EACH PROBLEM 1 mile = 5,280 ft1 L = 1.06 qts1 lb = 454g1. ?25 meters to inches1 kg = 2.2 lbs1 lb = 16 oz1 gal = 4 qts2. ?12 ounces to kilograms3. ?59 feet to meters4. ?17 gallons to liters1. Convert 4.5 in/min ?to ?m/hr 2. Convert 12 oz/gallon ?to ?g/L 3. Convert 55.0 ft/hr ?to cm/sec 4. Convert 22.80 g/L ?to kg/mL WORKSHEET #5REVIEW FOR TEST1. A 500.0 g mass is weighed three times on the same balance and the following results were obtained: ?492.5 g, 492.8 g and 492.6 g. ?Describe these results in terms of accuracy and precision.2. ?Use the ruler along the side of the page to measure the length of your pencil. ?Be sure to use the correct number of significant digits and units in your answer.3. ?Determine the number of significant digits in the following numbers:a)57,000_____b)0.0070200_____b)0.0050_____d)4,200.0_____4. ?Calculate the density of an object with a mass of 23.45 g and a volume of 5.6 g.5. ?Find the mass of an object that has a density of 1.02 g/ml and a volume of 4.5 ml.6. The mass of an object is 5.66 g with a density of 1.32 g/ml. ?What is the volume? MAKE SURE TO SHOW ALL WORK FOR EACH PROBLEM1in = 2.54cmMAKE SURE THE UNITS ACCOMPANY YOUR ANSWER1ft = 12 inchesCIRCLE THE ANSWER AT THE END OF EACH PROBLEM1 mile = 5,280 ft1 L = 1.06 qts1 lb = 454g1. ?3.50 inches to centimeters1 kg = 2.2 lbs1 lb = 16 oz1 gal = 4 qts2. ?0.050 kilograms to ounces3. ?253.0 milliliters to quarts4. ?1.500 oz/gal to g/ml5. ??650. in/sec to mi/hr ................
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