Chemistry concepts and calculations

You dissolve a compound with a molecular mass of 267.84 in a 10-mL volumetric fl

You dissolve a compound with a molecular mass of 267.84 in a 10-mL volumetric flask. You remove a 1.00-mL aliquot, place it in a 25-mL volumetric flask and dilute it to the mark. …

You dissolve a compound with a molecular mass of 271.98 g/mol in a 10-mL volumet

You dissolve a compound with a molecular mass of 271.98 g/mol in a 10-mL volumetric flask. You remove a 1.00-mL aliquot, place it in a 25-mL volumetric flask and dilute it to the …

You dissolve a compound with a molecular mass of 272.05 in a 10-mL volumetric fl

You dissolve a compound with a molecular mass of 272.05 in a 10-mL volumetric flask. You remove a 1.00-mL aliquot, place it in a 25-mL volumetric flask and dilute it to the mark. …

You dissolve a compound with a molecular mass of 289.49 in a 10-mL volumetric fl

You dissolve a compound with a molecular mass of 289.49 in a 10-mL volumetric flask. You remove a 1.00-mL aliquot, place it in a 25-mL volumetric flask and dilute it to the mark. …

You distilled a mixture whose composition was known on a vol : vol basis. Howeve

You distilled a mixture whose composition was known on a vol : vol basis. However, molar composition is usually more useful. Apply the data below to a 15.0 mL sample consisting of…

You distilled a mixture whose composition was known on a vol : vol basis. Howeve

You distilled a mixture whose composition was known on a vol : vol basis. However, molar composition is usually more useful. Apply the data below to a 15.0 mL sample consisting of…

You do not need nor may you use arrays for this program. Write a C program NOT C

You do not need nor may you use arrays for this program. Write a C program NOT C++ that merges the numbers in two files and writes the results to a third file. The program reads i…

You don\'t have to use Lucidchart. This is not meant to be a DFD describing a pa

You don't have to use Lucidchart. This is not meant to be a DFD describing a particular business environment, the labels used are intentionally generic. The generic words in the d…

You don\'t need to do the Excel work but please show me how to do each parts (sa

You don't need to do the Excel work but please show me how to do each parts (sample calculation will help me a lot). You don't need to do the Excel work but please show me how to …

You examined the spectrum of green food dye, which had a transmittance minimum a

You examined the spectrum of green food dye, which had a transmittance minimum at about 630 mn. Does permanganate have a shorter or longer wavelength at its minimum transmittance?…

You fill a thermos bottle with milk and shake vigorously. If milk is considered

You fill a thermos bottle with milk and shake vigorously. If milk is considered the system (a) will the temperature rise as a result of the shaking, (b) has heat been added to the…

You find a penny in the snow. How much heat is absorbed by the penny as it warms

You find a penny in the snow. How much heat is absorbed by the penny as it warms from the temperature of the snow, which is -8.0°C, to the temperature of your body (37.0 °C)? Assu…

You find an unlabeled box of fine needles, and want to determine how thick they

You find an unlabeled box of fine needles, and want to determine how thick they are. A standard ruler won't do the job, since all you can tell is that each needle is less than a m…

You find an unlabeled box of fine needles, and want to determine how thick they

You find an unlabeled box of fine needles, and want to determine how thick they are. A standard ruler won't do the job, since all you can tell is that each needle is less than a m…

You find another unlabeled dye bottle in lab. This bottle is of a different colo

You find another unlabeled dye bottle in lab. This bottle is of a different color dye. You begin to determine the concentration and find that your lab mate has already made a cali…

You first treated your unknown solution with 1 M K 2 C 2 O 4 and 1 M CH 3 COOH a

You first treated your unknown solution with 1 M K2C2O4and 1 M CH3COOH and a yellow precipitate formed. The liquid remaining atop this precipitate was removed after centrifugation…

You forgot to carefully dry your glassware prior to starting the experiment, but

You forgot to carefully dry your glassware prior to starting the experiment, but figured it couldn't be too important and went ahead with the reaction anyway. Upon completing the …

You found that a diluted sample contained 2.3 ng mL^-1 nucleic acid by measuring

You found that a diluted sample contained 2.3 ng mL^-1 nucleic acid by measuring the A_260 of a 1:200 dilution. How much nucleic acid was in the original solution? A 150 mu L solu…

You freeze a bottle of milk soda in your freezer so it becomes a solid. When you

You freeze a bottle of milk soda in your freezer so it becomes a solid. When you take it out and the solid just just starts to thaw, how does the liquid tastes like? Explain why. …

You go to a convenience store to buy candy and find the owner to be odd. He allo

You go to a convenience store to buy candy and find the owner to be odd. He allows you to buy pieces in multiples of 4 and to buy 4, you need $0.23. He only allows you to do this …

You harvest mouse monocyte cell line raw 264.7 cells from a culture plate and de

You harvest mouse monocyte cell line raw 264.7 cells from a culture plate and determine that you have a total volume of 9.6 ml. You remove an aliquot to a hemacytometer and count …

You have 1.00 g salicylic acid dissolved in 50.0 mL dichloromethane, and you hav

You have 1.00 g salicylic acid dissolved in 50.0 mL dichloromethane, and you have 90.0 mL of water available in your hood. The partition coefficient, K, for CDCM/C water is equal …

You have 1.00g sample of hydrate of Na2CO3. By heating the compound, you drive o

You have 1.00g sample of hydrate of Na2CO3. By heating the compound, you drive off the water and are left with 0.3704g of the anhydrous compound. a. What mass of water has been dr…

You have 100 g of ice at -20 C that is heated to a temperature of 0 C (stage 1),

You have 100 g of ice at -20 C that is heated to a temperature of 0 C (stage 1), melted at 0 C (stage 2), heated to 100 C (stage 3), vaporized at 100 C (stage 4) and heated to 150…

You have 100 mu L of bacterial stock solution. You take an empty tube \'A\', add

You have 100 mu L of bacterial stock solution. You take an empty tube 'A', add that 100 mu L of bacterial stock and then add 600 mu L of 0.85% saline to it. You will label the tub…

You have 100 mu L of bacterial stock solution. You take an empty tube \'A\', add

You have 100 mu L of bacterial stock solution. You take an empty tube 'A', add that 100 mu L of bacterial stock and then add 600 mu L of 0 85% saline to it. You will label the tub…

You have 100 mu L of bacterial stock solution. You take an empty tube \'A\', add

You have 100 mu L of bacterial stock solution. You take an empty tube 'A', add that 100 mu L of bacterial stock and then add 600 mu L of 0.85% saline to it. You will label the tub…

You have 100. mL of aqueous 0.40 M CuSO 4 mixed with 100. mL of aqueous 0.20 M N

You have 100. mL of aqueous 0.40 M CuSO4 mixed with 100. mL of aqueous 0.20 M Na2S. 1. What kind of reaction could potentially take place? (a) Bronsted-Lowry acid base (b) redox (…

You have 125 g samples of three different metals: A, B, and C. They look alike,

You have 125 g samples of three different metals: A, B, and C. They look alike, so you decide to tell them a using their different specific heats. You input 5.0 kJ of heat to all …

You have 15.00 mL of a 0.150 M aqueous solution of the weak base CH_3 NH_2 (K_b

You have 15.00 mL of a 0.150 M aqueous solution of the weak base CH_3 NH_2 (K_b = 5.00 times 10^-4). This solution will be titrated with 0.150 M HCl. (a) How many mL of acid must …

You have 18.7 mL of 0.0500 M AgC2H3O2(aq) and measure it\'s conductivity to be 8

You have 18.7 mL of 0.0500 M AgC2H3O2(aq) and measure it's conductivity to be 8557 ?S/cm. You have 18.7 mL of 0.0500 M HI(aq) and measure it's conductivity to be 23394 ?S/cm. Both…

You have 250.0 mL of a 4.00 M sugar solution. You and 217.3 mL of water of this

You have 250.0 mL of a 4.00 M sugar solution. You and 217.3 mL of water of this solution. Determine the concentration of the divided sugar solution after the water has been added.…

You have 250ml of a buffer containing a weak acid with a pka = 3.5 . The buffer

You have 250ml of a buffer containing a weak acid with a pka = 3.5 . The buffer is present in the solution at a concentration of 0.4M (mol/L). The starting pH of the buffer = 3. H…

You have 3 beakers: Beaker 1 contains 50.0 ml of 0.123 M HC2H3O2 Beaker 2 contai

You have 3 beakers: Beaker 1 contains 50.0 ml of 0.123 M HC2H3O2 Beaker 2 contains 25.0 ml of 0.456 M NaC2H3O2 Beaker 3 contains 5.0 ml of 0.789 M HCl A.) What is the pH of the so…

You have 3 ml of a 300 mg/dl glucose solution and you need to make 3ml of a 150

You have 3 ml of a 300 mg/dl glucose solution and you need to make 3ml of a 150 mg/dl solution how do you make this dilution? Make a 75 mg/dl solution using a 450 mg/dl stock solu…

You have 350 mL of a 5 M NaCl solution. You are told to use this to prepare 500

You have 350 mL of a 5 M NaCl solution. You are told to use this to prepare 500 mL of a 1 M NaCl solution. The molecular weight of NaCl is 58.4 g. A. Pour 225 mL of the 5 M NaCl i…

You have 4 beakers each containing one of these four compounds: A) sodium chlori

You have 4 beakers each containing one of these four compounds: A) sodium chloride (solid sample) B) glucose (solid sample) C) hexane (CH3(CH2)4CH3) [liquid] D) water (liquid) Exp…

You have 425 mL of an 0.35 M acetic acid solution. What volume (V) of 1.10 M NaO

You have 425 mL of an 0.35 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.34? (The pKa of acetic acid…

You have 425 mL of an 0.35 M acetic acid solution. What volume (V) of 1.10 M NaO

You have 425 mL of an 0.35 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.34? (The pKa of acetic acid…

You have 5 test tubes (shown below): Tube 1: 2 drops of unknown A and 5 drops of

You have 5 test tubes (shown below): Tube 1: 2 drops of unknown A and 5 drops of AgNO3 Tube 2: 2 drops of unknown B and 5 drops of AgNO3 Tube 3: 2 drops of unknown C and 5 drops o…

You have 5 test tubes each filled with a different pure compound. You also have

You have 5 test tubes each filled with a different pure compound. You also have a lot of extra test tubes and any other reagents needed to identify each compound. One contains ben…

You have 5 test tubes each filled with a different pure compound. You also have

You have 5 test tubes each filled with a different pure compound. You also have a lot of extra test tubes and any other reagents needed to identify each compound. One contains ben…

You have 50 minutes to complete this exam. All answers must be marked on your Sc

You have 50 minutes to complete this exam. All answers must be marked on your Scantron using No.2 pencil ONLY. Scantron sheets marked in pen or other writing utensil not recognize…

You have 50 minutes to complete this exam. All answers must be marked on your Sc

You have 50 minutes to complete this exam. All answers must be marked on your Scantron using No.2 pencil ONLY. Scantron sheets marked in pen or other writing utensil not recognize…

You have 50.0 g of warm water in a calorimeter at 35.0 degree C. You then add 50

You have 50.0 g of warm water in a calorimeter at 35.0 degree C. You then add 50.0 g of cold water at 1.7 degree C and the final temperature of the system was 18.9 degree C. (Spec…

You have 50.55uM of MgCl2 which is the same as 0.00295g. You have 12 wells. How

You have 50.55uM of MgCl2 which is the same as 0.00295g. You have 12 wells. How much water is necessary to dilute the sample so that: Well 1 has 0% MgCl2 Well 2 has 1% MgCl2 Well …

You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH_3COOH)

You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH_3COOH) and 0.20 M sodium acetate (CH_3COONa). What will the pH of this solution be after the addition of 2…

You have 600 mL of 50 mM methyl amine (pKa=10.7). Using a pH meter, you add HCl

You have 600 mL of 50 mM methyl amine (pKa=10.7). Using a pH meter, you add HCl until the pH is 10.4, than add water to a total volume of 1 liter. What are the concentrations of m…

You have 600 mL of 50 mM methyl amine (pKa=10.7). Using a pH meter, you add HCl

You have 600 mL of 50 mM methyl amine (pKa=10.7). Using a pH meter, you add HCl until the pH is 10.4, than add water to a total volume of 1 liter. What are the concentrations of m…

You have 700. mL of a solution that is 0.40 M HCO3- and 0.13 M CO3 -2. What mass

You have 700. mL of a solution that is 0.40 M HCO3- and 0.13 M CO3 -2. What mass of NaHCO3 or Na2CO3 is needed to change the pH of this solution to 10.50? Please answer both quest…