lab 1 notes orgo

Using the table complete the correct value and percent error

02A: 2.1-2.5 and Accuracy Handout (70 min) ulate Figures of Merit for Trueness ▾ Part A. Absolute Error A breathalyzer is a portable electrochemical instrument that measures the concentration of ethyl alcohol in a sample of exhaled breath A forensic chemist checks the calibration of a breathalyzer by testing a standard air sample known to contain 0.174 mg/L of ethanol seven times. The average value of these seven replicate measurements is found to be 0 157 mg/1 Calculate the absolute error of the breathalyzer. 1971 ΑΣΦΑ Submit Previous Answers Request Answer ? Previous x Incorrect; Try Again: 4 attempts remaining Q Search mgl ly Colle 16 of 17 E dx Next 11:44 PM 1/31/202 BANG &

pls help asap and Be sure your answer is rounded to the correct number of significiant digits.

Please help with the following, make sure your asner is correct with proper signs 100%, pls and thank you

K 12

Be sure to answer all parts. These organic solvents are used to clean compact discs: Solvent Chloroform Diethyl ether Ethanol Isopropanol Toluene (a) If a 15.00-mL sample of CD cleaner weighs 22.380 g at 20°C, which solvent is most likely to be present? O Chloroform O Diethyl ether Density (g/mL) at 20°C 1.492 0.714 0.789 0.785 0.867 Ethanol Isopropanol Toluene (b) The chemist analyzing the cleaner calibrates her equipment and finds that the pipet is accurate to +0.02 mL, and the balance is accurate to ± 0.003 g. Is this equipment precise enough to distinguish between toluene and chloroform? yes no

12. Calculate % difference using equation 2. Show set-up. |trail 1 density – trial 2 density 0.961-0.979 (2) % difference x100%= X 100% average denisty 0.97 cole nhw tobni % Difference:

Hello! I'm in need of some help understanding how to do these concept calculations.  DATA  Trial 1: Mg Trial 2: MgO Trial 3: Mg Trial 4: MgO Mass of Mg/MgO 0.4119 g 0.9850 g 0.4014 g 1.0001 g Initial Temp in ℃ 22.3 ℃ 22.8 ℃ 22.7 ℃ 23.2 ℃ Final Temp in ℃ 41.4 ℃ 29.4 ℃ 40.9 ℃ 28.7 ℃ Change in Temp in ℃ 19.1 ℃ 6.6 ℃ 18.2 ℃ 5.5 ℃    1 A)   For each of your trials determine the heat liberated. Assume the HCI solution in the calorimeter has a density of 1.00 g/mL and that the calorimeter loses a negligible amount of heat. (The specific heat of the solution can be assumed to be the same as water, 4.184 J/g.℃.)                    q = (mass) × (specific heat) × (Δt)  q = (kilojoules)   Trial 1: ________.     Trial 2: ________.     Trial 3: _________.      Trial 4: _________.   1 B)    Change each q to ΔH with the appropriate sign. Remember that enthalpy has been gained by the water, therefore, enthalpy has been lost by the reaction system. ΔH = (kilojoules)   Trial 1: ________.…

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.

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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

a) With reference to the Pb-Sn phase diagram for a 25wt% Pb-75wt% Sn alloy that is cooled from the liquid phase: (i) At what temperature does the first solid form (ii) What is the composition of this solid phase (iii) At what temperature does the material become completely solidified (iv) What are the amounts of the phases present just below the temperature when the material completely solidifies ), answer the following questions b) Sketch the expected microstructures, with the phases labeled, after slow cooling from the liquid phase to 190 °C and 100 °C

Please don't provide handwritten solution .....

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

Can you please answer 1-4 please

7) The homogeneity of the chloride level in a water sample from a lake was tested by an analyst. Below are the concentration in parts per million (ppm) of Cl: 27.32, 27.22, 27.21, 27.24, 27.20 i. Determine the mean and median. ii. Calculate the confidence limit at 90%. iii. Identify a possible outlier and use the Q-test to determine whether it can be retained or rejected at 90% confidence level