Lab 4

Give only typing answer with explanation and conclusion

20 Mercury analysis results performed on a drinking water sample are given in the table below. 13 15 Analysis No1 Mercury (ppb) 54.1 55.5 63.8 54.4 55.8 57.9 Which value is the average with the 90% confidence interval? (t = 2.02, s = 3.63) a) O 56.9 ± -3.0 b) O 56.9 + -2.8 C) O 55.9 ± -3.0 d) O 56.9 ± -3.1 O Boş bırak

1-10. The table shows fuel efficiency for several automobiles CO2 emission (g CO2/km) Fuel consumption (L/100 km) Car model Gasoline engine 4.6 109 Peugeot 107 266 Audi Cabriolet 11.1 346 Chevrolet Tahoe 14.6 Diesel engine Peugeot 107 4.1 109 8.4 223 Audi Cabriolet SOURCE: M. T Oliver-Hoyo and G. Pinto, "Using the Relationship Between Vehicle Fuel Con sumption and CO2 Emissions to Illustrate Chemical Principles," J. Chem. Ed. 2008, 85, 218. (a) A mile is 5 280 feet and a foot is 12 inches. Use Table 1-4 to find how many miles are in 1 km. (b) The gasoline-engine Peugeot 107 consumes 4.6 L of fuel per 100 km. Express the fuel efficiency in miles per gallon. A U.S. liquid gallon is 3.785 4 L (c) The diesel Cabriolet is more efficient than the gasoline Cabriolet. How many metric tons of CO2 are produced by the diesel and gaso- line Cabriolets in 15 000 miles of driving? A metric ton is 1 000 kg.

Answer letter k

i need help calculating slope and inverse slope pleas

Chem 101-Midterm exam 2 (2) Hi Ferit, when you submit this form, the owner will be able to see your name and email address. Calculate the mass of the air contained in a room that measures 1.50 m x 2.50 mx 3.00 m (density of air = 1.82 g/dm3 at 25°C). (8 Points) 20.475 kg 30.273 kg O 10.578 kg 47.88 kg A metal melts at 545.0°C. What temperature is this in K and °F? (7 Points)

question 4 and 5

Simplify. Write each answer in scie 17) (5.4x 10")는 (7X/0") 19) (6 x 10°(4 x 10-1) 21) (7.68 x 10:)는 (9x/0°)

2:59 AT&T Aa 2:58 PM, Apr 22 Save Share II H3G H3C H30* ? Brz H3C SCH3

B NA BH2 bh3 S = 6 6H Calculator: NA indicates neutral axis Section Modulus I Beam Universal Calculator For the next four questions (including this one) ignore k and k1 in your calculations. Using the same table, enter the value for B in inches. (three sig figs)

Do 1 and 7 only thank you. I'll upvote

1-11 Exactly 5.00-mL aliquots of a solution containing phenobarbital were measured into 50.00-mL volumetric flasks and made basic with KOH. The following volumes of a standard solution of phenobarbital containing 2.000 µg/mL of phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50, and 2.00 mL. The fluorescence of each of these solutions was measured with a fluorometer, which gave values of 3.26, 4.80, 6.41, 8.02, and 9.56, respectively. (a) Plot the data. *(b) Using the plot from (a), calculate the concentration of phenobarbital in the unknown.

Analysis was run on samples from a known CRM with 8.85% Fe. The following results for %Fe were obtained by an analyst: 8.75, 8.51, 8.25, 8.61. Which of the following statements is true assuming none of the data points are outliers?   Group of answer choices   Tcalc = 63.15 The analysis is not accurate at the 95% confidence interval.   Tcalc = 3.03 The analysis is accurate at the 95% confidence interval.   Not enough information to determine   Tcalc = 63.15 The analysis is accurate at the 95% confidence interval.   Tcalc = 3.03 The analysis is not accurate at the 95% confidence interval.

Ⓒ 1990 Cengage Learning Pre-Laboratory Assignment 1. At 25 °C, 10.0181 g of an unknown liquid was found to have a volume of 6.75 mL. (1) Calculate the density of the liquid. d = m d = 10.0181g 6.75 ml (2) Which of the following liquids was the unknown? water toluene chloroform -1 density, g mL-¹ at 25 °C 0.9982 0.8669 1.4832 (3) If the unknown liquid had been water, what would the volume have been? (4) What mass would a 10.00-mL sample of each of the liquids in (2) have? 11 0.674g answer answer water toluene chloroform answer answer answer

Give detailed Solution with explanation needed (don't give Handwritten answer

Question 10 What is the correct equation for percent difference? |measured+accepted| |measured-accepted|/2 х 100 |value 1-value 2|| |value 1+ value 2|/2 × 100 |mеasured-accерeted] |accepted| х 100 |value 1 -valuие 2| х 100 laccеpted

(a) Is it true that 26.3 mpg gasoline translates to 319 g CO:/mi? i. Convert mpg (miles per gallon) to miles per kg (of gasoline) using the density of gasoline ii. Convert kg of gasoline to kg of C assuming the overall formula for gasoline is CıH1a5 ii. Convert kg of C to kg of CO2 iv. Now finally compute g CO:/mi corresponding to 26.3 mpg and compare to 319 g CO2/mi

1. σ=[(Σd2)/(n-1)]½ n= number of trials d= measured value - mean σ=[(8.50mL-8.74mL)2+(9.72mL-8.74mL)2+(8.00mL-8.74mL)2/(3-1)]½ 2. σ=[(Σd2)/(n-1)]½ n= number of trials d= measured value - mean σ=[(10.69-11.52)2+(11.80-11.52)2+(12.07-11.52)2/(3-1)]½

Express Surgery Center's (ESC) preferred stock, which has a par value equal to $160 per share, pays an annual dividend equal to 10 percent of the par value. If investors require a 14 percent return to purchase ESC's preferred stock, what is the stock's market value? Do not round intermediate calculations. Round your answer to the nearest cent.

Use the calibration curve or linear regression equation to determine the concentration of FD&C blue dye No. 1 in Kool-aid. Food Coloring is 0.026 M in FD&C blue dye No. 1 7.5 x 10 -5 M is 29 mL -> 1000 mL

(vv)% = (10.0 mL150 mL) × 100 %Here, first solve the bracket,= (0.06666) × 100%now, do multiplication of above step,= 6.666 %= 6.7%vv% = 10.0 mL150 mL × 100 %Here, first solve the bracket,= 0.06666 × 100%now, do multiplication of above step,= 6.666 %= 6.7%   This problem answer is not helping me. Is there any way you can give me a video I can watch or something please stuck on a homework problem?  I'm trying to understand what v/v w/v and molairty

Please correct answer and don't use hand rating

10 11 12 13 14 15 16 17 18 19 20 Calculate the solubility of BaCro, in water at 25 °C. You'll find K data in the ALEKS Data tab. sp Round your answer to 2 significant digits. Continue MacBook Air

Portfolio V (1-5)

1-38. To entertain children between the ages of 2 and 90, I enjoy popping corks from bottles containing vinegar and baking soda pour about 50 mL of vinegar into a 500-mL plastic bottle. Then I wrap about 5 g of baking soda (which is sodium bicarbonate, NaHCO3) in one layer of tissue and drop the tissue into the bottle I place a cork tightly in the mouth of the bottle and step back. The chemical reaction generates CO2(g) that pressurizes the bottle and eventually bursts the cork into the air. Everyone smiles. I CH2CO2HNaHCO3 >CH2CO2 + Na + CO2(g) H2O Acetic acid Sodium bicarbonate in vinegar in baking soda (a) Find the formula mass of acetic acid and of sodium bicarbonate (b) How many grams of acetic acid are required to react with 5 g of NaHCO3? (c) Vinegar contains ~5 wt% acetic acid. How many grams of vinegar are required to react with 5 g of NaHCO3? The density of vinegar is close to 1.0 g/mL. How many mL of vinegar are required to react with 5 g of NaHCO3? (d) Which is the limiting…

Which of the following molecules are antihistamines? Check all that apply. ► View Available Hint(s) U 0 H-N L CH,CH,NH,* But CH–O–CH,CH,−N CH,CH,NHNH, H 4

Chemistry Hello! Can you please explain why these answers are wrong? Thank you.

can you show how the highlighted answers are acheived?

1-30. How many grams of boric acid, B(OH)3 (FM 61.83), should be used to make 2.00 L of 0.050 0 M solution? What kind of flask is used to prepare this solution?