10. A scientist performs an experiment and then records the times required for a certain chemical reaction to occur. The times for the reactions to occur are normally distributed and have a mean time of 38 s and a standard deviation of 2.3 s. Use z-score tables or technology to answer the following questions. a) What percentage of chemical reactions occur between 41 s and 43 s? b) What percentage of chemical reactions occur in less than 39 s? Page 5 STATISTICS-REVIEW ASSIGNMENT

10. A scientist performs an experiment and then records the times required for a certain chemical reaction to occur. The times for the reactions to occur are normally distributed and have a mean time of 38 s and a standard deviation of 2.3 s. Use z-score tables or technology to answer the following questions. a) What percentage of chemical reactions occur between 41 s and 43 s? b) What percentage of chemical reactions occur in less than 39 s? Page 5 STATISTICS-REVIEW ASSIGNMENT

Introductory Chemistry: A Foundation

8th Edition

ISBN:9781285199030

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter1: Chemistry: An Introduction

Section: Chapter Questions

Problem 11ALQ

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Home Tools Lab Experiment #... x ... +) 玩, 1 | 2 97.4% Record your observations following each reaction including changes in color and state of matter. AGNO3 (Ag*) Pb(NO3)2 (Pb²*) Ca(NO3)2 (Ca²+) а e i NazCO3 Light orange solid white, cloudy solid white, cloudy, solid (СО2) b NaOH f dark brown solid stay clear, liquid white, cloudy solid (OH) g k NazSO4 stay clear, liquid white, cloudy, solid white, cloudy, solid (SO?) d NaCl 1 white, cloudy solid white, cloudy solid stay clear, liquid (CF) .... Remember to complete and submit this table to your instructor before the end of the class session.
A catalytic converter contains between 3.00 and 7.00 g of Pt. The current price of platinumis $26.89 per ounce. What is the range in cost of Pt in one catalytic converter?
List ways that you could modify the equipment to improve the data you obtain if you were performing this experiment today instead of 180 years ago.
You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc. The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.
This question has multiple parts. Work all the parts to get the most points. Use the References to access important values if needed for this question. 18 16 14 12 10 8 6 4. Choose the correct relationship for the plot shown above. O a direct proportion O an inverse proportion O linear with a positive slope and nonzero y-intercept O linear with a negative slope and nonzero y-intercept Submit Cengage Learning | Cengage Technical Support MacBook Air DII E5 F6 EZ FA F9 F10 F 2$ & * ) 4 5 6 7 8 * 00
O Macmillan Learning One important test for kidney disease involves measuring the levels of bicarbonate (HCO,) in blood. Normal bicarbonate levels for a person ranging in age from 18 to 59 years old is 23-29 mmol/L. A lab purchased a new instrument to measure bicarbonate levels in blood and needs to certify it against their current instrument. The bicarbonate levels in the blood of a 38 year old woman was measured using the old and new instrument. The blood was tested 6 times using each instrument. The mean concentration of bicarbonate using the old instrument was found to be 24.4 mmol/L. with a standard deviation of 1.54 mmol/L. The new instrument yielded a mean concentration of 25.5 mmol/L with a standard deviation of 0.48 mmol/L... Determine if there is a significant difference in the standard deviations of the two sets of measurements made by the two instruments at the 95% confidence level. Determine the value of Fale Feale= 10.293 Determine the value of Fuble- Refer to the table…
How did you get this? k===0.693t1/20.69315 hrs0.0462 hrs−1k=0.693t1/2=0.69315 hrs=0.0462 hrs 0.693 a 102.0 nanogram(ng) sample of sodium-24 was stored in a lead-lined cabinet for 2.5 days How much sodium-24 remained? The half-life os sodium -24 is 15 hours _________ ng sodium -24 remain check_circle Expert Answer thumb_up thumb_down Step 1 Radioactive decay is a first order reaction. Conversion of days into hours: 1 day2.5 days===24 hrs2.5×2460 hrs1 day=24 hrs2.5 days=2.5×24=60 hrs Calculation of k: k===0.693t1/20.69315 hrs0.0462 hrs−1k=0.693t1/2=0.69315 hrs=0.0462 hrs-1 Step 2 Radioactive decay is a first order reaction, therefore: [A]=[Ao] e−kt[A]=[Ao] e-kt where [A] is the final amount remained at time t, [Ao] is the initial amount. Putting values: [A]====102.0 ng×e−0.0462 hrs−1×60 hrs102.0 ng×e−2.772102.0 ng×0.062546.38 ng[A]=102.0 ng×e-0.0462 hrs-1×60 hrs=102.0 ng×e-2.772=102.0 ng×0.06254=6.38 ng Thus 6.38 ng of sodium-24 remained.
Using this chart : Time (seconds) [PHT] ln[PHT] 1/[PHT] 0 0.005000 -5.298 200.0 10.5 0.004500 -5.404 222.2 22.3 0.004000 -5.521 250.0 35.7 0.003500 -5.655 285.7 51.1 0.003000 -5.809 333.3 69.3 0.002500 -5.991 400.0 91.6 0.002000 -6.215 500.0 120.4 0.001500 -6.502 666.7 160.9 0.001000 -6.908 1.000E3 230.3 0.0005000 -7.601 2.000E3 *Your x-axis should be "time"zero order: time vs [PHT]first order: time vs ln[PHT]second order: time vs 1/[PHT]Enter the absolute value of both slope and correlation into the table below. Order slope correlation 0 1 2
[Review Topics] [References) Use the References to access important values if needed for this question. In a study of the decomposition of ammonia on a tungsten surface at 1100 °C NH3 1/2 N₂ + 3/2 H₂ the concentration of NH3 was followed as a function of time. It was found that a graph of [NH3] versus time in seconds gave a straight line with a slope of -4.86x10-6 M s-1 and a y-intercept of 1.31x10-² M. Based on this plot, the reaction is Submit Answer Retry Entire Group rder in NH3 and the rate constant for the reaction is zero first second 9 more group attempts remaining Ms-1.
Lab Data Time (min) 0 5 10 15 20 Rate of volume change (mL/hr) Rate of volume change( hr = Tube 1 White Light Volume (ml) 2.8 3.8 4.7 5.6 6.6 1 final volume(mL)-initial volume(mL) Time (min) How to Calculate Rate of Volume Change i Tube 2 Covered Volume (mL) 2.8 2.4 2 1.6 1.2 x 60( -X min hr 1 Complete the following steps: Calculate rate of volume change fa Elodea in white light. Record in Lall Data Calculate rate of volume change fo Elodea in covered tube. Record in I Data
Real-World Chemistry 1. Suppose you wanted to ship bananas from Puerto Rico to New York and the time required for shipment was 8 days. Will you choose to ship ripe bananas or green bananas? Why? 2. You may have heard the saying "One bad apple will spoil the whole barrel." Based on the results of | your experiment, do you think the statement may be true? Why?
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 S