Students conducted an analysis of baking soda in chemistry lab. During the activity, they had to calculate the mass in grams of the baking soda being used. Some student data appears in the table. At the end of the activity, the teacher told the students that the actual mass of baking soda was 0.45 grams. Which student had the most accurate and precise data? A B C D Mel Ginny Carl Steve

Students conducted an analysis of baking soda in chemistry lab. During the activity, they had to calculate the mass in grams of the baking soda being used. Some student data appears in the table. At the end of the activity, the teacher told the students that the actual mass of baking soda was 0.45 grams. Which student had the most accurate and precise data? A B C D Mel Ginny Carl Steve

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.12QAP

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During the discussion of gaseous diffusion for enriching uranium, it was claimed that 235UF6 diffuses 0.4% faster than 238UF6. Show the calculation that supports this value. The molar mass of 235UF6=235.043930+618.998403=349.034348 g/mol, and the molar mass of 238UF6=238.050788+618.998403=352.241206 g/mol.
The air in a recently used classroom 9m x 7m x 9m tested 0.12% carbon dioxide. How many cubic meters of fresh air must be admitted per minute in order that 10 minutes later it shall contain not over 0.06% carbon dioxide. Fresh air contains 0.04% carbon dioxide. Assumeimmediate mixing of fresh with stale air. (A) 14 (B) 11 (C) 15 (D) 19 (E) 17
s.com/course.html?courseld%3D15828855&HeplD353706194671Of71a192e43597b01c6e0#10301 Principles of Chemistry I (Chem 1107-327) signments <09 - Pre-Lab 9.11 Pre-Lab Methane burns in oxygen to produce CO2 and H2O. CH:(9) + 202(g)→2H»O(1) +CO2(g) Part A If 0.55 L of gaseous CH, is bumed at STP, what volume of O, is required for complete combustion? Hνα ΑΣφ Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining 40 DELL
(a) The researchers are requested to prepare a 5.23 mol dm³ of concentration of Sodium Thiosulphate for the laboratory. The researchers have measured the concentration of the solution prepared by using the Sodium Thiosulphate Concentration Monitor. The result of the experiments is shown in Table 1. Table 1 Reading (M) Researcher Equipment Type Average 3 1 АВС-1 4.75 4.98 4.66 4.80 Y АВС-2 5.40 5.20 5.30 5.30 Z АВС-3 3.45 2.58 4.52 3.52 i. Based on the Table 1, conclude the results obtained by the researchers. ii. Define the metrology term: Error. iii. Calculate the error percentage obtained by each researchers.
| ax NME /Chemical%20Reactions%20Asgn%202-5.pdf 9 Employee Home r4c Covenant Health Ca... Outlook.com - Free... S Birthday party politi. G what does it mea 1 / 2 100% Chemical Reactions-Write Neat and Balanced Reactions from Word Equations You need to submit one sheet of paper (not this one), that is very neat, with a fully balanced reaction for these 6 reactions Remember to include proper states. 1. solid potassium metal reacts with oxygen gas to produce solid potassium oxide. 2. solid potassium chlorate decomposes into oxygen gas and solid potassium chloride. 3. solid aluminum oxide is decomposed into solid aluminum and oxygen gas. 4. aqueous cobalt(III) nitrate reacts with solid zinc to produce aqueous zinc nitrate and solid cobalt.
5R) The net ionic equation for formation of an aqueous solution of Nil2 accompanied by evolution of CO2 gas via mixing solid NICO3 and aqueous hydriodic acid is A) 2NICO3 (s) + HI (aq) - 2H20 (1) + CO2 (g) + 2N12+ (aq) 2H20 (1) + CO2 (g) + Ni2+ (aq) + HI (aq) B) NICO3 (s) + I (aq) O NICO3 (s) + 2H* (aq) H20 (1) + CO2 (g) + Ni2+ (aq) 2H20 (1) + CO2 (g) + Nil2 (aq) D) NICO3 (s) + 2HI (aq) E) NICO3 (s) + 2HI (aq) H20 (1) + CO2 (g) + Ni2+ (aq) + 21- (aq) Answer. C
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(d) By using the data provided below, calculate the PillingBedworth ratio for the nickel (Ni) – nickel oxide (NiO) system and determine whether NiO is protective against corrosion. Atomic mass of nickel = 58.7 g.mol-1 Density of nickel = 8.91 Mg.m-3 Molecular mass of nickel oxide = 74.7 g.mol-1 Density of nickel oxide = 6.67 Mg.m-3 (e) A stainless steel pressure vessel that has fracture toughness, K1C, of 197 MN.m-3/2 is going to be exposed to a stress of 398 MN.m-2 . By using this information explain how designers can determine the thickness of the vessel so that catastrophic failure can be avoided.
Be sure to answer all parts. Hint Nitroglycerin (C3H;N3O9) is a powerful explosive. Its decomposition may be represented by Solution 4C3H5N3O9 → 6N2 + 12CO, + 10H,O + 02 Guided Solution This reaction generates a large amount of heat and gaseous products. It is the sudden formation of these gases, together with their rapid expansion, that produces the explosion. (a) What is the maximum amount of O, in grams that can be obtained from 5.50 × 102 g of nitroglycerin? (b) Calculate the percent yield in this reaction if the amount of O, generated is found to be 16.4 g. Next > < Prev 19 of 45 29°C Mostly clear e to search
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Conte X ALEK X O Rich x Ceng Bb Excel Bb What X O COVI e Daily x O Amon x e Chat N Ne www-awn.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNsikr7j8P3jH-lIJOkWvnm4w-aQ-rw-zRhgRnayfmbBs65spEVIGu-K5Jx48w9eOKISqsha Click to go forward, hold to see history Apps R Blackboard 2Mail - Ava Schied. O UAConnect Biology Syllabus J Labflow - Courses O Explore - HogSync O Packback + MyN Objective Knowledge Check Question 13 Calculate the mass of glucose (C,H,,0,) that contains a trillion (1.0 x 102) oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits. I Don't Know Submit O 2020 McGraw-Hill Edu MacBook Dro
In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)