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Given below is a diagram of separation of two components of a mixture in a chromatographic column. From the diagram, which component has lesser affinity to the stationary phase?    a X   b Z   c F   d D

Six measurements are obtained for the mass of water delivered by a calibrated volumetric pipet: 4.518 g, 4.521 g. 4.520 g. 4.526 g, 4.518 g, and 4.521 g. Use a spreadsheet to determine the mean and 95% confidence interval of these measurements. mean: 95% confidence interval: %23

1.2. A 55.0 g metallic disk at 323 °C is placed in 170 cm³ of ethyl alcohol at 15 °C, then removed after a short period of time. The metallic disk temperature was observed to have dropped to 135 °C. Calculate the new temperature of ethyl alcohol after the aluminium disk has been removed? (Density of ethyl alcohol is 790 kg/m³) REDMI NOTE 10S

Using the table complete the correct value and percent error

Portfolio V (1-5)

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

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

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: ________.…

Given below is a diagram of separation of two components of a mixture in a chromatographic column. From the diagram, which component has lesser affinity to the stationary phase? Component D Component F Component Z Component X Ox OZ OF D

When two predictors are highly correlated, which of the following statements is true?         -Ridge regression will usually have non-zero coefficients for both predictors.         -Ridge Regression will drive coefficients to zero for both features.         -Lasso regression will usually have non-zero coefficients for both predictors.         -Elastic net will usually have non-zero coefficients for both predictors   select the correct option

Which of the following correlation coefficients indicates the strongest relationship between variables?

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.

What is the precision? SHOW ALL CALCULATIONS:

(10) You have 4 powdered samples, A, B, C, & D. One sample contains fullerenes, C16 to C70. Another is nano diamond. Another one is a mixture of C60 and carbon nanotubes. The 4th is a mixture of graphite & graphene. Indicate the analytical methods you would use to identify and distinguish the samples from each other.

A student measured the melting point range of an unknown solid to be 72.4 to 78.6 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? If no, what compounds from Table 2.2 can be excluded? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48

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

The primary standard substance must be less equivalent weight (or molecular Wt. ) False True

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

10.(0-2) Dry ice is solidified carbon(IV) oxide. It is an ingredient in so-called cooling mixtures. It is obtained by expanding liquid carbon(IV) oxide and pressing. Under normal conditions, dry ice sublimates easily. Its density is about 1.4-9,. Calculate the volume under normal conditions of cm the carbon(IV) oxide that results from the complete sublimation of 5 cm3 of dry ice.

this is analytical chemistry please show complete solution

Says my answer is wrong. Do not give handwriting solution.

(81310 - 76200) ÷ 0.00216 With Sig Figs

kindly calculate for the % error only 4 5 and 6

Melting Point of Compounds and Mixtures Yes Melting point measurements Table 1. Melting point of pure compounds Complete melted temperature ("C) Start melting temperature (°C) Pure benzoic acid 123 126 Pure mandelic acid 117 124 Table 2. Melting point for mixtures of benzoic and mandelic acid Complete melted temperature (°C) Start melting temperature (°C) 80:20 mixture (benzoic acid:mandelic acid) 113 117 60:40 mixture (benzoic acid:mandelic acid) 100 109 40:60 mixture (benzoic acid:mandelic acid) 96 104 20:80 mixture (benzoic acid:mandelic acid) 107 113 Calculations and Analysis Determine the midpoint of the starting and completed melting temperatures. Use those temperatures to graph the melting points of the pure compounds and the mixtures. Table view List view Table 3. Melting point analysis Start melting temp ('C) Complete melted temp (°C) Midpoint of melting temp range (°C) Pure benzoic acid 123 126 80:20 mixture (benzoic acid:mandelic acid) 113 117 60:40 mixture (benzoic…

The percentage of an additive in gasoline was measured six times with the following results: 0.13; 0.12; 0.16; 0.17; 0.20 and 0.11%. What is the 99% confidence interval for the additive percentage?

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