Week 3 measurement and uncertainty Lab

11 of 1 Review | Constants | Periodic Ta Part B [(285.0 x 10°) – (1.300 × 10’)] × 2.8988 Express your answer to the appropriate number of significant digits. Ενα ΑΣφ [(285.0 x 10°) – (1.300 × 10')] × 2.8988 = Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Your response should have more than three significant figures since both values involved in the product will have greater than three significant figures When you take the difference between 285.0 x 10° and 1.300 x 103 the last significant digit is determined by the value that is significant to the least number of decimal places, which is 285.0 x 105 Part C 1:37 62°F 1/14/ acer

Part 3: Calculate density of a metal an unknown metal. 1. Using the pictures below, record the displayed data in the data table in the report sheet. Make sure to include the right number of significant figures in the measurements and calculations. Mass measurement 7.1 g Volume of water measurement. There's only one measurement here – the larger image is for magnification only. -20 15 m Volume of water and metal measurement. There's only one measurement here – the larger image is for magnification only. 20 m 15

Wallie weighed 3 different cylinders that all looked the same. He noticed that the masses were all different and wondered how much they deviated from the average. Determine the average deviation, in g, of the cylinder masses below. Cylinder Mass (g) 1 31.8 2 31.39 3 31.96

0.009 hm = %3D cm 1.0023 dm = hm %3D 0.2203 daL = µL %3D 515 cm = km

A measurement of the mass of a specimen was determined to be 4.203 +- 0.001 g. What is fractional uncertainty of mass? A 0.1 B 0.01 C 0.0001 D 0.002

Try Again Your answer is incorrect. • Part 1: Your answer is wrong. In addition to checking your math, check that you used the right data and DID NOT round any intermediate calculations. • Part 2: Your answer is correct. Warning: you must write a decimal point in numbers with measurement uncertainty, even if there are no decimal places to show. A raindrop has a mass of 50. mg and the Pacific Ocean has a mass of 7.08 × 1020 kg. Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of raindrops? 30.0 x 10 ? How many moles of raindrops are in the Pacific Ocean? 24

Accuracy and precision are two important factors to consider when taking data measurements and they refers to the agreement between experimental data and a known value. O True False O O

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6. Define accuracy. Give the equation used to determine the accuracy of a measurement. 7. Define precision. Give the equation used to determine the precision of a measurement.

An electric current of 155.0 mA flows for 42.0 minutes. Calculate the amount of electric charge transported.. Be sure your answer has the correct unit symbol and 3 significant digits. 0 x10 μ 0 9 X

2. Students measured and recorded the mass of a rock four times. The true mass of the rock is known to be 3.25 grams. Complete the table and determine the average (mean), the deviations from the mean, the deviations squared, the standard deviation, and percent error. Trial # Mass (g) Deviation Deviation squared 3.22 2 3.21 3. 3.20 4 3.21 Standard Deviation Average (mean) Absolute Error Percent Error

Chapter 1 em 13 13 Part D A pound of coffee beans yields 60 cups of coffee (4 cups = 1 qt). How many milliliters of coffee can be obtained from 1.0 g of coffee beans? %3D Express your answer using two significant figures. Vα ΑΣφ mL Submit Request Answer < Return to Assignment Provide Feedback P Pearson t Contact Privacy Policyl Permissions Terms of Use | Copyright © 2020 Pearson Education Inc. All rights reserved. 47% 6)

d57df728ca7011b52e183d2247#10001 Part B |Ε| ΑΣΦ Submit An intramuscular medication is given at 5.00 mg/kg of body weight. What is the dose for a 190-lb patient? Express the mass in milligrams to two significant figures. Part C Request Answer PPearson ? < mg 12 of 15 Review | Constants | Periodic Table n Inc. All rights reserved. | Terms of Use Privacy Policy | Permissions | Contact Us |

[References] Use the References to access important values if needed for this question. The boiling point of a liquid is found to be 302 K. What is this temperature on the Celsius and Fahrenheit scales? Temperature = °C %3D Temperature = OF %3D 4 more group attempts remaining Submit Answer Retry Entire Group

HP TrueVision HD Pavil cal App AN Careers 4 Texas Workfor Mộc Homework X W College Physic agleonline.hccs.edu/courses/188795/assignments/3601808 mabie diter rep 4 dl 10.17am Homework Ch16 - Attempt 1 Problem 16.35 11 of 15 > Constants | Periodic Table Complete the third row. Express your answer using two significant figures. Complete the following table by calculating the missing entries and indicating whether the solution is acidic or basic. Acidic or [H+] [OH-] pH pOH basic? ΑΣφ 7.4x10-3 [OH ] 3.3x10-10 M 8.25 Submit Request Answer 5.73 hp ODOLE ADVANCED fa f9 ho 4+ fn 10 f12. insert

1. Suppose a ruler is used to measure the length of an object as shown in the figure below. Laboratory Questions: Significant Figures cm Record a reasonable measurement showing appropriate significant figures. 2. Obtain a quantity of water. Using the thermometer from your lab drawer, record its temperature to the correct number of significant figures. 3. Circle which of the following mass measurements is more precise: 42.5 g or 42.456 g. 4. What is the uncertainty of a measurement written as 15.000? 5. State the number of significant figures in each of the following values. a. 30.01 d. 9.2500 x 10-3 b. 7.00 e. 8.05 x 106 c. 0.002900 f. 0.00000010 6. Perform each of the following computations using the measured quantities below. Write your final answer with the correct number of significant figures in proper scientific notation (one non-zero number to the left of the decimal point). 4 305 x (5.43 + 9.3) = Answer:4 73 trd a. 305 (50.40,9)=15402.195 b. (6.183 x 104)(6.720 x 10-7) =…

Two methods were used to measure the arsenic level (ppb) in drinking water. Quantity Method I Method II Mean arsenic concentration (ppb) Standard deviation (ppb) Number of measurements 1.382 0.025 1.346 0.039 4 4 F calculated=? Are the standard deviations significantly different? I calculated=? Are the means significantly different?

Explain the difference between random error and systematic error.

General Chemistry C OWLV2 | Online teaching and learning resource from C.. b My Questions [References] Use the References to access important values if needed for this questi A calculator is found to have a mass of 118 grams. Using unit analysis, show what the mass of this calculator is in pounds. Use one of the following to set up the conversion factor. 454 g = 1 lb = 16 oz 1 m = 39.4 in = 3.28 feet 2.54 cm = 1 in 1 km = 0.621 mile 1L = 1.06 qt 3.79 L = 1 gal (number) (unit) 118 grams x lb (number) (unit) Submit Answer Try Another Version 5 item attempts remaining Cengage Learning | Cengage Technical Support

What is the percent abundance (in units of percent) of zinc in a sample whose density is 7.639 g/mL and the only other component is copper? The density for pure copper is 8.96 g/cm³ and the density of pure zinc is 7.13 g/cm³. Report your answer to one decimal place. NOTE: This question is meant to give you practice before your data. The density value generated is random within a certain realistic constraint. It will not be representative of your data in the experiment.

[References] Use the References to access important values if needed for this question. A soda bottle is found to have a volume of 772 mL. Using unit analysis, show what the volume of this soda bottle is in L. Use one of the following to set up the conversion factor. 1 kg = 1000 g =1L Visited 100 cm=1 m 1000 mg=1g 3 1 mL=1 cm³ 1000 mm=1m 772 mL X (number) (unit) (number)(unit) Submit Answer L Try Another Version 1 item attempt remaining Previous Next>

The accepted density of Manning is 18.00g/mL. Your lab team measures the density of Manning to be 19.00g/mL. What is your percent error?

[Review Topics) [References) Use the References to access important values if needed for this question. A general chemistry student found a chunk of metal in the basement of a friend's house. To figure out what it was, she used the ideas just developed in class about density. She measured the mass of the metal to be 340.3 grams. Then she dropped the metal into a measuring cup and found that it displaced 15.7 mL of water. Calculate the density of the metal. Density = g/mL Densities of Some Common Substances Substance Density (g/mL) Water 1.00 Aluminum 2.72 Chromium 7.25 Nickel 8.91 Copper 8.94 Silver 10.50 Lead 11.34 Mercury 13.60 Gold 19.28 Tungsten 19.38 Platinum 21.46 This metal is most likely Submit Answer Retry Entire Group 9 more group attempts remaining Previous Email InstruC Cengage Learning | Cengage Technical Support W P. 63°F Mostly sunny DII PrtScn Home PgDn End F10 & R T. K L

8 cm3 = __________ L Group of answer choices .0227 22.7 57800 .0578

Gen Chem Unit la - Measureme Ô https://www.bookwidgets.com/play/NGejLxXT-iQAEfd3mfAAAA/ZCNV3ZZ/gen-chem-unit-1?teacher id=6079380641021952 Gen Chem Unit la - Measurement & Uncertainty /1 QUESTION 33 In lab you measure out the volume of a liquid 4 times. The measurements you got were 16.4 mL, 16.6 mL, 16.5 mL, and 16.4 mL. What is the average, rounded to the correct number of significant figures and expressed w/ the correct units?

Hawaii Carbon Dioxide Time-Series 425 CO2 Time Series in the North Pacific 8.30 Mauna Loa Atmospheric CO2 (ppm) ALOHA seawater PCO2 insitu (uatm) ALOHA seawater pH (insitu) 400- 160°W 158°W 156°W 8.25 23°N Station ALOHA 22 375- - 8.20 21° 20° Station Mauna Loa 8 350- 190 -8.15 325 8.10 300- 8.05 275- 8.00 2021 1958 1967 1976 1985 1994 Year" Data Mauna Loa (php.ondi noan ovproductsrendaeeee n mlo iN) ALOHA phahana soest hawaieduttdogstexionhl) ALOHA pi &C0, e calulated a insitu tempere fhom DIC A TA (measured from samples collected on Hawai Ocean Times-series IOT) enuisen) ing coys (Pelletier, v2so) wih constants Lueker et al. 2000, KSO Dickson, Total boron Lee et al. 2010, & KF secarb 2003 2012 What problem in the oceans does the data collected from 1985 to 2021 show?