Scientific Measurement Worksheet

CHEM IA MRS. RICHARDS UNIT 2 TEST REVIEW : MEASUREMENT & CALCULATIONS STUDY: UNIT 2 NOTE PACKET, PRACTICE WORKSHEETS, SCI . NOTATION QUIZ, SI CONVERSION QUIZ 1. The Scientific Method 1. The scientific method IS a / CU fXfpmaiU^ to solving problems. 2. Why do we say that the scientific method is NOT just a fixed set of steps? sftps could b* Ktfeajbd / Varied . 3 Explain the difference between a qualitative and a quantitative measurement. if $ L( jv f C aescbptii 4. Label each of the measurements below as qualitative (QL) or quantitative (QN). a . ) small girl £_ j b.) 4.5 feet e. ) 87.5 meters f > /0 f.) cold water 5. A hypothesis must be: a . ) based on _ b.) able to be . _QJ\J &L prior k f /c d c ) 45°C (J k j d .) two inches j\ f { J g.) seven grams h .) 24 hours iMudcdae . 6 A good hypothesis doesn’t just predict what is expected to happen but also U 7. A theory attempts to n AN 1( something happens. why observations/ facts occur. II . Units of Measurement /) / dj J ,jfT>(XCL 8. Scientific notation is a shortcut for writing what types of numbers? 9. a.) In scientific notation, the coefficient must be between ___ . jf and / Q fjjLC ( b.) The exponent is the number of places you moved the c ) Numbers bigger than one have __ . exponents. 3 d .) Numbers smaller than one ( but bigger than zero) have (E exponents. 10. Write each of the following numbers in scientific notation: a.) 85, 000, 000 b.) 66, 800 L3±lL f ' d.) 0.0000089 . e ) 0.045 . *11 On the calculator, the “EE” takes the place of typing ‘1 HS K ny * /P X 2. . c ) 740 f.) 0.0006 Co X / O ' * /( 12. Using your calculator , solve the following problems. Your answers must be in scientific notation a.) 4.55 x 10 u b.) 6.8 x 108 d.) 4.4 x 10-8 - c.) 4.0 x 105 + 2.00 x 10 x 2.1 x 1010 H- 2.0 x 102 3.4 x 104 , ’° * 1 . ^28 xiCs IQ — 3- 4>U;x \cf HAHS CHEM IA MRS . RICHARDS 13. The S.I. System of measurement is: a.) an updated version of the /YU iri (L $ Cl < Gjv/q S’t 5> b. ) used by around the world ' c 14. For each quantity listed, identify the standard S. I . unit used to measure it. b. ) density a. ) length WnP -jf /U \tA J d.) mass 9 e. ) temperature 15. Fill in the symbol or name for each prefix below, b.) m yy, j ih c.) a.) mega M - e.) p DI Cr\ f ) giga n DM crc d.) nano CA h. ) k |Ct i 0 g ) deci 16. What is the base unit used to measure each quantity below? b.) length fry k j~ a. ) mass / j hv gr c. ) time f.) volume fO 3 . ft system ._ c ) volume ' . 17 Label the S. I . prefixes and their symbols on the line below. \\> V V H 0 « ^ A i .) c c^nii // LO 18. Complete the following conversions . Also state how many places and in which direction decimal moved . CONVERSION a.) 250 . mm to km b .) 0.000 007 5 GL to dL c.) 780 000. pg to pg d . ) 16. m to mm e.) 455 000. cL to kL f . ) 29. ng to mg h .) 945 . GL to ML i .) 0.000 009 5 Mg to mg j.) 1400 . nm to cm DECIMAL MOVEMENT 0.000250 km 6 to the left . 10 -> 7 5 0 0 C AL O e 7 6 >1 <3 / (r O O G .mn H ., 5 C-7j )^L O Cooo > g.) 0 ,008 km to m ANSWER / ^5 / 8 . hrv 9 7 5 0 0 0- ML QSOO . •A3 . O c o a H tLrvN, 3^ «- 5 ^6 3 -5 - 3 / CHEM IA HAHS MRS . RICHARDS 19. Fill in the density triangle below, and then write the formula for mass, volume, and density. J XV fo d= m= ( V V m = d 20. Solve each density problem below . You must show your work. ft g and a vol ume ofl a.) What is the density of a metal block that has a mass of 4. ml ;? ^ m v ol = 4.35Tq cl - / 0 . 1m l ^^ t —- b.) What is the mass of a rock that has a density of 55 j mLjand a volume of 4.10 mb? - d %v rn = 3 iS ^ Q n y m - /0 . 5 j H,l0 ^ o. c.) What is the volutne of a metal cylinder that a: a density of i2 . g/L - and a mass of 1.25 g? V d u= ' ^ 757 % object 21 . How can you use density to tell if an - ‘ 10 / tX a. ) sink in its surroundings? I tS will : /%)&/& ojojlJO: )cS S xfajOf b.) float in its surroundings? i fa 22. Temperature measures the amount of 23. Fill in the table for WATER: jK i f\£ hC of particles in matter. . onj Freezing Temperature Boiling Temperature 24. a . ) How do you convert from °C to K ? f CJ °c / D£ °c 3 33- °F °F 2-\ j b.) How do you to convert from K to °C? 25. Absolute zero is zero on what temperature scale? 26 . Complete the following temperature conversions. T a.) 275 K to °C ~ Uepl‘C' d .) 104 K to °C [ I. Using Scientific b.) 875 °C to K 1133 e.) 895 °C toK I I fr & K ^ c.) 195 K to °C -t f.) 25 °C to K — ZXT - 1 ft Measurement 27. Explain the difference between accuracy and precision . accuracy- A - QW dote precision how dor* O' (X fh 6 SU rCfrwd S .ri* j o -f - j y) /J fv xn < tec fad e/ i f a r u t d- 0~oli o Ohl \ A> HAHS CHEM IA MRS . RICHARDS 28. A student measures the same lines three times and gets the following: 2.45 cm, 2.42 cm, and 2.41 cm. •o &t K ? yQU ) Lok ~ 1 cxc tvout V & IKJC i i C /c j c t l y e j Jr cJoA' f- \ " LL^- a.) Are her measurements accurate? Why or why not? b. ) Are her measurements precise? Why or why not? eech other >< 29. When reading a measurement to the correct number of significant figures , record everything you can and then estimate !I ffofrlrd < £ /- dt ji c 30. Read each measurement to the correct number of significant figures . Underline your estimated digit. SS ) 2 SS 2 IT 8| 7 5 2 1 8 i TT 9 i i ( uryv r 12 Qm 31. Using the Atlantic and Pacific rules, state how many significant figures are in each quantity below. Remember the answer may be “ unlimited ” for an exact number. 1 a. ) 5.000670 meters 3 d.) 1850 feet g. ) 0.97 grams c.) 240 cats b.) 0.00088 meters e.) 0.0909 liters A 3 Litll f.) 65, 600 grams h.) 12 oranges L i f ^ L- 3 i.) 19, 400, 000 meters 32. Complete each calculation shown below, rounding the answers to the correct rules. b.) 5.480 g a.) + 3.2 I dp ix g £ St dst ( msT)} x 225 g + 4.7 g OdpA l dp ( i / 5 4 /1) 115 5 ' o. 04 4 8.4 86 g 1150 g c .) - 0.0012 g ddf (Jilt'S o} e. ) A 0.045 g * f. ) 0.0086 g x 1.786 g d s f ( o . Ol 54>5\ ..) O . tMS * * * g- ) 1000 g A 54 g &0 1st* dSt d . ) 2.58 g 3 - 1.88 g ^ ( o^ ) 0.40 h.) 6.889 g A 4,2 g 2 so A . ( UbVO . . ’) i 2A