Kim_Nguyen_D2L lab assign. 2
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Post Lab Report— Measurement ___ /25 CH 104 OL ' N Name : [Ciwy Ngon Hguges Date of Lab - (O / (3/ o3 o It is essential to watch the videos in the lab description for this lab in the course. You will be applying this learning in future labs, when you get to make your own measurements with tools from your lab kit. e Please plan 2-3 hours for watching the videos and answering questions. Consider re-watching the videos while filling out this form to ensure that you are correct. e Take the time to review/edit your work (best done on another day) before submitting to make sure you are being clear and complete. e Answer all questions with complete statements. Measurements Part A: Length Measurements (4 points) Observations: Record two observations you have about the length measurement video posted on D2L. Note: In this case, an observation is not a measurement, but something you notice about the measurement process. (1 point total) g Nimakers (mm) macking arc Horths of centinader, _flN" e T;SM— ol ke cLQ,o:v\c\‘. o ot w oul 4 be o P\ —_— — T S S hne oM5 M 1« =\ A voder oy digit oot T un dvedths place of canh . . VoL mort preusSion : L1 Tt ploce valu g 0 ‘ WACR rAainT Y | AL ’UI\L \_)\\OL\L s\ er Side A e rn oR Lhe M f;u«(,u,».a/‘l. v, ot te \ wé 7 (6} cm J(L*-* huwne X ey & . & o Twie ” |.A ens s . o) (Q_‘A\d\ e WIT 2 < oY l Q4 e - §
Here are the length measurements of 4 objects that were measured with a ruler by a student in a lab. Review the measurements and complete the last column. How many sig figs in Object Measurement Precision the measurement? Review the list above, which object(s) were recorded correctly by the student using the ruler with markings to the millimeters (mm)? Explain your reasoning using a complete sentence. (1 point total) OB\\F—U\' A P Ob;\cc‘\' 4 are W Hiedere mar\dv\jg,bccaw% of Yo CL?—L""\Q' olumns, BDA (QDSUJFS Dok retorded Cufe_.(;l’{\s o ( \Lh ol Yo mg,cu_u,rgun-#- and PrLC\S(D" Questions: (1 point each) 1. What is the “digit of uncertainty” when using a ruler that has markings for millimeters? (Look at the decimals - is it the hundredths or thousandths place for cm?) The “clt‘su’ of unmr,}.m’,\b“ &t 4k hundreddhs F,lau\ he em 4 lied vhween Awo vq\M of 4 rfl'\”l’kvkr e couit 2. How would you indicate the precision of the estimated digit in data from the ruler using the #/- notation? (include units) + 0.0\l o=
Mass Measurements (8 points) Observations: Watch the video posted in the Mass Measurement section for this lab on D2L and post two observa’tions from the video. Note: In this case, an observation is not a measurement, but something you notice about the measurement process. (1 point total) | pPapeyr ar \ oy p ag - /\& e o helonte o | G 14 ) w4 V. n ~ VT \ + P mass boek 6n ' Ha Bealancs sur—r:\xuz_ o 20 ow T ( Py \ T o -S!—'k.L ¢ ;t\\c}(\yj Q‘ ‘.20./ or coat. e ,‘Q ’L.'DO r-r\\kc\f\ -_f_amplp’ Qe —&—e\,\u,m Lol (orhainer dow p o \\' back nio dhe stecle o d ) = dipose o Remowt the RXCRSS to o plece oF paps AT S\ i+ “'DPULS‘ Here are some mass measurements for metal blocks in our chemistry lab on campus. In the first 3 measurements, we measured the blocks separately. Add up the mass of the three blocks together and then compare it to the mass of the three blocks weighed at the same time in the questions that follow. (1 point total) Mass of block 1 43.63 g Mass of block 2 3028 g Mass of block 3 5288 g Mass of all three blocks added together | 26.174 g Mass of all three blocks weighed at the same time 12681 g
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Questions: 1. What is the “digit of uncertainty” when using the electronic balance in this lab? (Look at the decimals, is it the tenths or the hundredths place?) (1 point total) . _ , are Yhe digt oF UncarteiTY The \\uWAYLA+L\ \)\au_ < C d 2. How would you indicate the precision of the estimated digit in your data using the +/- notation? (Include units.) (1 point total) +0.0\ 9 3. |s there a difference between the mass measurement of the three blocks added together and the mass measurement of the three weighed at the same time? Why is there a difference or why might there be a difference if you did not see one? (1 point total) NN 007_3 betwern e \ Heov /(S | > e < _H\W_Q_ blCLLS y‘SCFs;VflLLlB' ; B PIQS e o SN v cakme A . 4 e blocks ot Hee . \ T 0ra diflecent \W\a:fi ke dut fo outr ‘Q\r(““\c%\w M, . ‘T\J, 0. j g bce of&d\f:) —Hu_ bo\fll\(.'!_ wo nNan VM:;"W": L a o 4. The balance in the video (and in the labs on campus) reads to the hundredth place. If the mass of your object was exactly ten grams, the recorded value would need to read to the hundredth place, how you would report all the zeros after the decimal as: (1 point total) 0.OO g How many sig figs are there in this value? H
5. In your lab kit, your electronic balance is not as precise as the balances we use in the labs on campus. You will be able to read to the tenths place only. If the mass of your object was exactly ten grams, what would you record for this value using a balance that reads to the tenths place? ' (1 point total) O«O g HO\ht/ many significant figures are in your recorded value? (Explain in one complete sentence.) 20 wowld eeod 3 ;;3 &—\S o Mo fLQofd‘LJ ua,t@ becoumse - the Jenths P\au. gue me P digit S GQL,\Q\\‘A valua ‘than il ores can be X O'\3 closer 4o \y — p\am. 6. If your lab partner recorded 31 g for a mass measurement, would you accept that value? Explain why or why not using a complete sentence. (1 point total) \ luee hrcoumse b Lell mae T wowld nek e»»c,u.ek— 2\ g va e _:{.'3\"\— CD‘L UI‘C‘Q_V—L&»"“L\A ove 0 M ones F\QL‘L w"\\'j«‘f\ .Cq’fl t’LL 9_,0(3 or Z'Zfi Loy paass raasurenent TWS could le_ad 'j ©Q ol s fradonsshbiacampissattrh haratta 99 . Tl recult would e mors aconvrede and precise. Volume Measurements (7 points total) Observations (1 point): Watch the two videos on measuring volume in a beaker and a graduated cylinder. Include one observation you noticed about each video (note, this observation is not a measurement but something you notice about making the measurement). | 1. When meosuring \LG“Md n O . ; > oA Ha maoark ot o ( i A 24 owl & e o da waoreg D tdety \ \ | [ O ml- on = e oc or o nCremant o~ \ ( hove ont 2 7 d wlinday 2l measurmeenT w I\ in qra a- %) ) bt ) | pe e ce © ad - 4 ¢ Qe on -+ la IS - \ raci—a ore o oo e P\a eSS Twa g f | \ Hen \ - +AR [Sapeled R |4 > yioe o auye lovel @ : b .
Data: (2 points): Write the number measured in the video to the correct number of significant figures for each device. Include the precision using the +/- notation. Beaker Graduated Cylinder (Large) Questions: (1 point each) 1. With which type of glassware — the 50-mL graduated cylinder or beaker- were you able to record the most digits? Explain why using a complete sentence. The SOm\- jr&c&u\qb\A L:)\TY\A,QJ wo%\l reCord Par mosk digit, ) lendhg 'p[afc;z whech - ts : (ys 2 b1 camse s a%P@K’”‘\k : ' (fi;\,/l_, o are Pftc,l‘—f"v r&carutu\j, o 2. The “digit of uncertainty” in the volume measurement performed with the 50 mL © graduated cylinder is in the tenths place. The precision is read as +/- 0.1mL indicating that the tenths place is the estimated digit for this tool. What place is the “digit of uncertainty” in the volume measurement performed with the beaker? (i.e. one’s place; tenth’s place; hundreth'’s place) Ona's place 3. How would you indicate the precision for the estimated digit in the data for the beaker using the +/- as above for the beaker? (include units) +4 L 4. Would you use the beaker to measure a required volume of 8.5 mL? Explain why or why not using a complete sentence. se 0 Lo gk \,,)ouv\d net use e \peakar Yo measuwe e O st 4 (L _w mqw MLU-VLW“+ NeuLr YMoyre pre L\QAL'\ —-V:i N o ot BT TE G e SEme ] whwol. 1 wmbey 2 i u: \‘A;((\ .8 O } “C(Lwflwleltfl v \/O“ [UA\A hrad )
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Post Lab Problems: 6 points 1. Assuming the data below was collected using only the pieces of equipment discussed in this lab, determine if the following pieces of data are correct based on the appropriate number of significant figures. Circle (or highlight) the one(s) that are correct. (2 points total) Graduated Cylinder: 24.35 mL 12.456 mL Beaker @ 430mL 3167mL Lab Balance 15.678 g 5.49 Ruler 13.4 cm 2.567 cm 2. Describe how you decided which pieces of data to circle for each piece of equipment listed below. In other words, how can you tell from the instrument which decimal place is uncertain? (1 point total) Graduated Cylinder Craduoied (‘,3\'«.\)/ MSM\\‘-) ’\D l/\.fl—\? Vav_s\,J,v.f r:bn.& ‘HA»L VO\\&M @ \(\CVLMA# o@ a w\AG\L V\\.\vab(f \/ciw‘l.. W lOr\(é,u q,\A 5k0fl2f mor'(_]nj L e \(c\m\'é, Tl \Orgbr and Hha E.’r\b"l-f' [N ar\g'm-] are Ol Ot (noremagak of Lonthns (\QLL. Twe Ldenthe P\"L& 15 e é(si-l- of mmu;—%—dm'\'\-s value., Balance Tea \olo \OA\O-V‘L& OM‘VL g = hunduidihs pplace o P8
3. How many sig figs are in the following measurements? (1 point total) 4. Add the following values: (1 point total) 3259 + 3.30g +3.15g +3.10g =/2.%C § How many sig figs in this answer? Explain your reasoning. i ) Lald _ L{ 5“5 ‘F.'js, because uInen QO‘JI’NI o smbtrac ‘hW\‘fl '“rl/\& anSwer JShow hova Hha number wirh P \LMH'_D.L\'W\O\\ plc'zuds\ pe 5. Calculate the average of the values above. (1 point total) 3.203 How many sig figs are in this average? Explain your reasoning. % elg Q\‘SS, becawse an nxu\r\{?\kjtl‘\s or out Avv\g i have He minimum nambacr o ;‘“f) st qom stg hgs, e answier sh ll Fee 0,\3 fna' n.,gmb,ufl,
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Raymond went to the grocery store with his mom. He started by pushing an empty grocery cart with 0 kg of mass. As the shopping trip progressed, the cart increased in mass from 0 kg to 10 kg.
Which argument below supports Raymond's claim that it was more difficult to push the 10 kg cart as opposed to the empty cart.
O As the cart decreased in mass, Raymond had to use more force to push the cart.
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8. A particular enzyme at a research facility is being studied by a group of graduate
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1. A few mls of an insoluble liquid is added to water. The density of the
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Adding or subtracting and multiplying or dividing measurements
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A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The concentration of a solution equals the mass
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O MEASUREMENT
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5-8. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is *(a) 500 mg. *(c) 150 mg. (b) 250 mg. (d) 70 mg.
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- ← Aktiv Chemistry STARTING AMOUNT + CLE SOD X X Aktiv Chemistry O8 https://app.101edu.co MAR 30 o Mail THOMPSON, X Convert 5.88 x 10-6 ADD FACTOR 10 x( ) 5.88 1 10-6 10⁹ m 10-⁹ 5.88 x 10-4 5.88 x 10-6 (IC) My.UAFS - Students: X Question 5 of 58 to nanometers. Use only the metric system. 5.88 x 104 5.88 x 10³ 0.0588 nm Zall = m alt ANSWER 5.88 x 10-15 5.88 x 10-4 0.01 M Inbox (11) - hthomp0 X 1000 588 0.1 RESET 2 58.8 0.001 106 tv A W Home - LioNetarrow_forwardFill in coefficientsarrow_forwardEJIYZPROfspoHcK3uA&lv=HbAhnaEn7foZmyeo a hjkml,/t[plkojihug. N Nitro Type | Compe.. E 3:28 Now playing. e QBA2 2020-2021 DO 12 13 14 15 16 17 18 19 20 21 21 of 21 Raymond went to the grocery store with his mom. He started by pushing an empty grocery cart with 0 kg of mass. As the shopping trip progressed, the cart increased in mass from 0 kg to 10 kg. Which argument below supports Raymond's claim that it was more difficult to push the 10 kg cart as opposed to the empty cart. O As the cart decreased in mass, Raymond had to use more force to push the cart. O As the cart increased in mass, Raymond had to use more force to push the cart. O As Raymond continued to push the cart during the duration of the trip, he became tired which made it more difficult to push the cart. O As Raymond continued to push the cart during the duration of the trip, friction began to build up on the wheels causing the cart to be more difficult to push.arrow_forward
- Complete the tablearrow_forwardFill in coefficientsarrow_forwardEmerson M Cremistr pdated late workE a educate.lindsay.k12.ca.us/iFrame.aspx?iCtri=STUDENT BASE HOME CONTROL O Empower 2021 O Ermpower 2021 pokmarks DE IXL Classes O Google Slides O Empower 2020 A Google Docs t Lindsay High School Physics Safety & Ski. E Guided pract 2-1 googlegalaxysclence.com Li Be 1-0 1-5 2-0 Al 2.5 3-0 3-5 Na Mg 1-2 Si S CI 0-9 1-5 1-8 Ge 2-1 2-5 3-0 K Ca Ga 1-6 As Se Br 0-8 1-0 1-8 2-0 2-4 Te 2-8 Rb Sr In Sn Sb 0-8 1-0 1-7 1-8 Pb 1-9 2-1 2-5 Cs 0-7 Ba TI Bi Po At 2-2 Review the chart above. It is showing how much energy it takes to remove an electron from each of those types of atoms. Why would 0.9 1-8 1-9 1-9 2-0 it be so high in the top right comer and so low in the lower len comer? It would be high in the top right coner because these electrons are closer to the nucleus and held more strongly, so they will take O A. more energy to remove. And the opposite is true for the lower left, farther from the nucleus and so not held as strongly, requiring less energy to…arrow_forward
- The Bay of Fundy in Nova Scotia, Canada is reported to have the largest tides in the world with high tide and low tide occurring two times per day. The tides can measure ft in height. At the Hopewell Rocks at Hopewell Cape, over approximately 50.0 on a specific day height increase was recorded as a rate of 6.08 feet per hour. What is the rate in meters per second ? ARTING AMOUNT ADD FACTOR DELETE ANSWER RESET *( ) %3D 60 5.15 x 104 1 0.332 7 50.0 111 1.20 x 103 0.3048 12 6.08 0.0309 ft ft/h h min day m/s Sarrow_forwardccess COWLv2 | Online teaching and I [References] Use the References to access important values if neede- A recipe calls for a cup and a half of coconut oil. Calculate its mass in grams if its density is 0.924 g/cm³. ( 1 qt=4 cup, 1 qt = 0.946 L). Mass= Submit Answeli g prod02-cnow-owl.cengagenow.com Unit 1 Homework_1 Try Another Version 1 item attempt remaining Click to have your response(s) scored by OWL. *Note that you will not be able to change your response(s) to this version of the item.arrow_forwardSmartwork5 Gen Chem X ttps://ncia.wwnorton.com/78450 SOUME E 02/02/21 2 Learning Objective: 1.J Set up dimensional analysis conversions. Question 1st attempt Do not include spaces in your answer. Fill in the appropriate unit conversions. (Report the molar mass of KCI using three sig. figs.) x x. =. | +, | log. cos. 8. mol 5.00 g KC1 1 mol KC1 100. mL 1L KC1 <13 pe here to search 99+ C F5 F3 F4 F6 F7 F8arrow_forward
- Doc X ← → C N Netflix Cos x Lapix M Inbc x X learn.canterbury.ac.uk/ultra/courses/_19016_1/outline/edit/document/_3537021_1?courseld=_19016_1&view=content The X Satu X Buy X a Ama X C Sho x X Gwha x o Ema X Intro X Cat X alculato "maxl ▸ (35 x ₁₁ G how x + F 8. A particular enzyme at a research facility is being studied by a group of graduate students. This enzyme has a Km value of 5.0 X 106 M. The students study this enzyme with an initial substrate concentration of 0.055 M. At one minute, 7 µM of product was made. What is the Vmax? 30arrow_forwardX Achieve > Students: Register X Assessment - Chem 101 002X nillanlearning.com/courses/55ace5f9-441e-4942-b91a-6dde768c655e/3/k6bu5e/tools/assessment/items/9f6b56a8-92b9-4b ent Check A LGive Up? O Hint OResources Score: 25 Perform the conversions. atm 1.196 atm = 860.8 mmHg = %3D Pa 1386.9 mmHg : atm %3D 287.3 kPa = %3Darrow_forwardFile Edit + Add Slide Insert Slide H View 125% Zoom Format + Add Page Play Keynote Live Table ¶ ✓ Insert Chart # Table Chart APR 9 T Text DENSE HW (15) ~ NEW DENSITY (1) ► T Text Shape Media Shape Comment Media DENSITY EXPERIMENT HOMEWORK 1. A few mls of an insoluble liquid is added to water. The density of the insoluble liquid is 1.8 g/L. What will happen upon mixing? Which layer will be on top? 2. Why does ice float on water? 3. What would you use to measure the mass of a solid? 4. What would you use to measure the volume of a liquid? 5. Density can be used to: 6. Is density a physical property or a chemical property? 7. A meniscus must be read at the top of the dip, the bottom of the dip, or above the dip? Comment MacBook Air Ne Collaba QUEENSBOROUGH SU COMMUNITY COLLEGEarrow_forward
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