MATH 302_Week 5Test_Q3_Q4 Attempt1

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Average and Uncertainty The molar mass of an unknown compound was determined in three repeat experiments. The molar masses obtained were 82.23, 81.55 and 82.00 g/mol. Assume the uncertainty in the average value to be the half range. Enter the average value and its uncertainty, both rounded to the appropriate number of digits (according to the Rules outlined in the Chem121 Lab Manual Appendix). g/mol

Suppose that in a random selection of 100 colored candies, 25% of them are blue. The candy company claims that thepercentage of blue candies is equal to 24%. Use a 0.05 significance level to test that claim.Identify the null and alternative hypotheses for this test. Choose the correct answer below.

4. In addition to finding the right answer can you explain what is Determinate error (I think the correct answer is the 3rd option here but not sure if right)

I am struggling with finding tcalc, I know it is not 1.64

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%

The following prompt will be used to answer the first six questions. An experiment was performed to separate the components of a binary mixture composed of sucrose (sugar) and sand. The following data was collected in lab during the experiment. Mass of original binary mixture: 20.100 ± 0.001 g Mass of initial filter paper: 21.206 ± 0.001 g Mass of filter paper and isolated sand: 25.226 ± 0.001 g 9b Given the data and information in the prompt, what is the calculated absolute error on the percent of sugar in the mixture? Enter the absolute error you calculated in the box below. You do not need to include the % symbol with your answer.

During a titration experiment, 50.00 mL of a certain solution needs to be transferred to an Erlenmeyer flask. To measure the volume, a student used a calibrated 10-mL pipette five times. If the pipette delivers an actual volume of 9.98 mL with an uncertainty of ±0.02 mL, what will be the uncertainty in the final volume?

A researcher has developed a new analytical method to determine the percent by mass iron in solids. To test the new method, the researcher purchases a standard reference material sample that is 2.85% iron by mass. Analysis of the iron standard returns values of 2.75%, 2.89%, 2.77%, 2.81%, and 2.87%. Are the results of the new method significantly different from the standard reference sample? (Hint: Use Confidence Interval)

Five calcite, CaCO3CaCO3 (MM 100.085 g/mol), samples of equal mass have a total mass of 12.1±0.1 g12.1±0.1 g. What is the average mass and absolute uncertainty of calcium in each sample? Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.

A sample ore is found to be 0.0015% gold and 0.0034% copper. What is the percentage of matter in the ore that is neither gold nor copper? Round your answer to the nearest ten thousandth

Bozo determined the density of a sample of aluminum.  For his sample, he found the volume was 0.350 cm3 and the mass was 0.822 g.  Given that the density of aluminum is 2.70 g/cm3, calculate Bozo’s percent accuracy error.

7. 22 This question is about several salts. (a) A hydrated salt, compound A, is analysed and has the following percentage composition by mass: Cr, 19.51%; CI, 39.96%; H, 4.51%; O, 36.02%. Calculate the formula of compound A, showing clearly the water of crystallisation. Show your working. formula of compound A = (b) A student carries out an experiment to determine the amount of water of crystallisation in the formula of another hydrated salt. The student intends to remove the water by heating the hydrated salt. A diagram of the apparatus used by the student is shown below. crucible pipeclay triangie The student adds the hydrated salt to the crucible and weighs the crucible and contents. The student heats the crucible and contents and allows them to cool. The student weighs the crucible and residue. The student's results are shown below. 16,84 Mass of crucible + hydrated salt/g 16.26 Mass of crucible + residue after heating/g

(904.6 - 2.9)/3.52 x 10^4

M Inbox ( x Precalc X A HOLID X Oluwa X Good ь Chemi X A fake X G spiral G the sar X X Micros X https://papers.xtremepape.rs/CAIE/IGCSE/Chemistry%20(0620)/0620_s05_qp_6.pdf The same mass of zinc was used each time. The volume of acid used was different each time. Use the syringe diagrams to record the volume of hydrogen produced each time in the table. Table of results volume of sulphuric acid/cm volume of syringe diagram hydrogen/cm3 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 15 10 20 30 40 50 60 70 80 20 10 20 30 40 50 60 70 80 25 10 20 30 40 50 60 70 80 30 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 35 40 10 20 30 40 50 60 70 80 ENG 23:09 O Type here to search 27°C US 21/04/2022

The density of a metal will vary depending on the size of the sample. Group of answer choices True False