Lab Report 1

Estimated volume of crucible 25.0 mL  measured volume of crucible 23.0 mL  percent error of estimate (% error=accepted value-experimental value/accepted value ) volume in (use measured volume of crucibleto answer for the ):  kL cL

Laboratory 2 Report Sheet-Lab 2 A.2 Area Your measurements Length = Width = Area = (Show calculations.) Why could two students obtain different values for the calculated areas of the same rectangle? A.3 Volume of a solid by direct measurement Shape of solid Formula for volume of solid 18 Height Width Another student's measurements Volume of the solid (Show calculations of volume including the units.) Length Diameter (if cylinder) Page 3 of 3 482 words 区

Please help with questions 2-3

Part A If 2.0 x 10-4 moles of S20 in 50 mL solution is consumed in 3 minutes and 17 seconds, what is the rate of consumption of S20 ? Express the rate in mol per liter-second to two significant digits. M 2.128 10 Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining < Return to Assignment Provide Feedback

Please help with question 6

DATA: Mass of potassium nitrate mass of test tube and potassium nitrate mass of test tube mass of potassium nitrate Volume of water taken Buret readings: Final gaml Initial Volume 4.97 added Temperature at which crystals appear Total volume of water in tube ML 1st addition 2nd addition 7.09ml 12.1ml 2.12 mal 7.09 ml 12.1ml 53.85839 43.9740g 9.9131 water. Record all data in the 4.97 9.98 15.78 4.97 9.98 3rd addition 17.9 ml 21.1ml 78.8 Temperature of water when volume is measured Density of water at when volume is measured (from reference) 0.970 Trial | || 52.0 39.1 21.4°C 15,18 4th addition 18.98 17.9ml ||| 28.2 18.98 IV 2

Please help with question 5

Estimated volume of crucible 25.0 mL  measured volume of crucible 23.0 mL  percent error of estimate (% error=accepted value-experimental value/accepted value ) volume in (used measured volume of crucible) kL cL

Please help with 7&8

1. a. What are the three classifications of chemicals used in analytical chemistry? (one is Primary Standard Grade) b. What are the three common sources of error encountered in weighing (one is buoyancy) c. To what precision can analytical balances (in mg) and pan balances (in g) be read

Please explain the steps and the formula being used.

Microsoft Teams Q Search ... 25 Assignment on matching phrases on classification_ units.docx Close Activity File Home Insert Layout References Review View Help O Tell me what you want to do 'Editing v O Comments A Catch up Chat Calibri (Body) v 11 A В I U Av A A Styles v O Find v Reuse Files O Dictate v E Editor : Designer ... ... MATCHING OF WORDS OR PHRASES Teams 1. Assignments 1. Alloys a) example of a derived unit 2. 2H b) allotropes of oxygen Calendar 3. Mixtures c) two or more different elements bonded 4. Smallest unit of a compound d) centi ... 5. Compound e) a qualitative statement 6. 02 and 03 f) kilo 7. Smallest unit of a compound g) a unit of measurement 8. One thousandth of a unit h) a quantitative statement 9. Teaspoon i) components separable by physical means 10. H2 j) homogeneous mixtures of metals 11. Density k) milli 12. A person is tall I) a molecule of hydrogen 13. one thousand of something m) atom 14. one hundredth n) two atoms of hydrogen 15. Somebody weighs 150…

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I. Data Record data with units. A. Standardization of KMnO4 1. Mass of beaker/paper + ferrous ammonium sulfate Empty Beaker Beaker and Sample Sample 1 7.40709 8. 4800g Sample 2 7.4364g 9.19498 Sample 3 7.46.324 8.48993 2. Buret readings Initial Reading Final Reading Sample 1 0.00mL 27.00m L Sample 2 21.6 mL 29.5mL Sample 3 33.5mL 29.3mL Mass of Sample 1.0439 0.45269 1.0259 Volume KMnO 27.00mL 27.40 mL 25.8ML

3. 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​​ b. 250 mg c. 60 mg 4. The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%

Question 4

= 1 = 2 = 3 = 5 6. 7 = 8 10 = 11 12 A chemist prepares a solution of calcium sulfate (CaSo,) by measuring out 0.482 umol of calcium sulfate into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's calcium sulfate solution. Round your answer to 3 significant digits. mmol Continue Submit A= © 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center e to search 74°F Mostly clear 立 O

How do I solve for the percent value? The sample data calculated the answers but I have no idea how they obtained the percent error values. Calculate sample data #1 with detailed steps.