Chemistry concepts and calculations

1.Write the molecular equation and the net ionic equation for the reaction of H2

1.Write the molecular equation and the net ionic equation for the reaction of H2SO4 with NaOH. 2. Exactly 25.00 mL of 0.1522 M H2SO4 were needed to titrate 45.25 mL of NaOH accord…

1.Write the symbol for chromium. What is the atomic number of it in the periodic

1.Write the symbol for chromium. What is the atomic number of it in the periodic table? How many protons and electrons are their in the atom of chromium? Give the highest possible…

1.You are following a truck in a driving rainstorm that is placarded 2029. Sudde

1.You are following a truck in a driving rainstorm that is placarded 2029. Suddenly the truck swerves to avoid an elk and topples on its side. You can see some type of fumes being…

1.You are studying gas pressure and you remember that one of the units used to d

1.You are studying gas pressure and you remember that one of the units used to describe gas pressure is pounds per square inch (abbreviated psi). You are a bit of a daredevil and …

1.You have 505 ml of 0.145M HCl solution and you want to dilute it to exactly 0.

1.You have 505 ml of 0.145M HCl solution and you want to dilute it to exactly 0.100M how much water should you add ? 2.what volumen of 0.612 M ammonium sulfate contains 6.70g of a…

1.You have a spreadsheet that contains performance data for the staff. How would

1.You have a spreadsheet that contains performance data for the staff. How would you organize this data considering that it would be data used for annual performance reviews for e…

1.You have a spreadsheet that contains performance data for the staff. How would

1.You have a spreadsheet that contains performance data for the staff. How would you organize this data considering that it would be data used for annual performance reviews for e…

1.You have been interested in astronomy for many years. Ms. Weiler, a 7th grade

1.You have been interested in astronomy for many years. Ms. Weiler, a 7th grade science teacher, asked you to deliver a presentation to her students. She requested that you focus …

1.You have to make 0.200 M acetate buffer by mixing 69.0 mL of the 0.200 M sodiu

1.You have to make 0.200 M acetate buffer by mixing 69.0 mL of the 0.200 M sodium acetate solution and 50.0 mL of the 0.200 M acetic acid solution. By using Henderson-Hasselbalch …

1.You have to make 0.200 M acetate buffer by mixing 69.0 mL of the 0.200 M sodiu

1.You have to make 0.200 M acetate buffer by mixing 69.0 mL of the 0.200 M sodium acetate solution and 50.0 mL of the 0.200 M acetic acid solution. By using Henderson-Hasselbalch …

1.You make single wavelength absorbance measurements for two solutions containin

1.You make single wavelength absorbance measurements for two solutions containing an absorbing analyte at concentrations C1 and C2 producing absorbance readings A1 and A2. Since C…

1.You run an LDH assay on one of your samples, and obtain an activity of 1.5 A/m

1.You run an LDH assay on one of your samples, and obtain an activity of 1.5 A/min. You then dilute the sample 1:10, and obtain an activity of 1.2 A/min. Is this the activity that…

1.You wish to make a 0.405 M hydrochloric acid solution from a stock solution of

1.You wish to make a 0.405 M hydrochloric acid solution from a stock solution of 3.00 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 100 …

1.You wish to make a 0.405 M hydrochloric acid solution from a stock solution of

1.You wish to make a 0.405 M hydrochloric acid solution from a stock solution of 3.00 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 100 …

1.Your task is to measure the amount of energy evolved during the combustion of

1.Your task is to measure the amount of energy evolved during the combustion of some hydrocarbon. Which of the following would be the ideal technique for this experiment? bomb man…

1.Your user interface must allow the user to enter the month, day, and year. You

1.Your user interface must allow the user to enter the month, day, and year. You can do this using text fields for input, or you can use ComboBoxes if you feel adventurous. 2.The …

1.Zeolites can be synthesized or changed to be in an ‘acidic’ form in which the

1.Zeolites can be synthesized or changed to be in an ‘acidic’ form in which the loosely held cations are H+. What aqueous solution would you use to replace H+ with Na+ and why? In…

1.[ Plot temperature (oC) vs. volume of distillate (ml) collected for the mixtur

1.[ Plot temperature (oC) vs. volume of distillate (ml) collected for the mixture with and without the fractionating column. Use the graph to determine the boiling ranges of the t…

1.[ Plot temperature (oC) vs. volume of distillate (ml) collected for the mixtur

1.[ Plot temperature (oC) vs. volume of distillate (ml) collected for the mixture with and without the fractionating column. Use the graph to determine the boiling ranges of the t…

1.a 50.0 ml sample of a 6.0m solution of hcl is diluted to 200 ml. What is the n

1.a 50.0 ml sample of a 6.0m solution of hcl is diluted to 200 ml. What is the new concentration. 2.what is the final concentration prepared by adding water to a 50.0 ml of 1.5 m …

1.a) 2.5 mL of acetone was placed in a 250 mL round bottom flask equipped with a

1.a) 2.5 mL of acetone was placed in a 250 mL round bottom flask equipped with a one-hole stopper and a glass tubing that extends into the flask. The liquid was evaporated using a…

1.a) Boiling Point ranges Fraction1 Fraction 2 Fraction 3 42-45 40-43 43-50 39-4

1.a) Boiling Point ranges Fraction1 Fraction 2 Fraction 3 42-45 40-43 43-50 39-40 Observed 41-48 38-39 Calibrated b) Boiling point of pure ethyl acetate Boiling point of pure buty…

1.a) If there are 6.0 mg of K+ contaminant per liter of water sample, calculate

1.a) If there are 6.0 mg of K+ contaminant per liter of water sample, calculate the number of moles of K+ per liter. b)Calculate the weight of K+ in a second sample of water that …

1.a) If there are 6.0 mg of K+ contaminant per liter of water sample, calculate

1.a) If there are 6.0 mg of K+ contaminant per liter of water sample, calculate the number of moles of K+ per liter. b)Calculate the weight of K+ in a second sample of water that …

1.a)How many milliliters of 0.0998 M NaOH are required to “neutralize” (react co

1.a)How many milliliters of 0.0998 M NaOH are required to “neutralize” (react completely) with 0.305 g of benzoic acid, C6H5COOH, (Molar mass = 122.12g/mol). b)What is the pH of t…

1.a. A saturated solution contains 54.5gCs 2 SO 4 in 30.0mL of water at 25 degre

1.a. A saturated solution contains 54.5gCs2SO4 in 30.0mL of water at 25 degreescelsius. What is thesolubility in g solute/(100g H2O)? Calculate the molefraction of solute at this …

1.a. Which of the following would you expect to be soluble in hexane (C 6 H 14 ,

1.a. Which of the following would you expect to be soluble in hexane (C6H14, pick all that apply)? I2                     KI                    Br2                   NaBr b.For th…

1.a.)Which boundary is referred to as the Mohorovicic discontinuity (or Moho): c

1.a.)Which boundary is referred to as the Mohorovicic discontinuity (or Moho): crust - upper mantle none of the above lithosphere - asthenosphere outer core - inner core upper man…

1.arrange the following alkyl halides in the order of the rate of their reaction

1.arrange the following alkyl halides in the order of the rate of their reactions with iodide( from fastest to slowest) a. 1-chlorobutane b)1-bromobutane c. 2-chlorobutane d. 2-br…

1.bring 5ml of bromophenol blue to your work station. obtain a P20 Pipetman and

1.bring 5ml of bromophenol blue to your work station. obtain a P20 Pipetman and record below the digits you see in the window on the side. What volume is the micropipette set to d…

1.bring 5ml of bromophenol blue to your work station. obtain a P20 Pipetman and

1.bring 5ml of bromophenol blue to your work station. obtain a P20 Pipetman and record below the digits you see in the window on the side. What volume is the micropipette set to d…

1.c) 1 to 1.2 gram samples of KHP (204.22g/mol, potassium hydrogen phthalate, no

1.c) 1 to 1.2 gram samples of KHP (204.22g/mol, potassium hydrogen phthalate, not potassium hydrogen phosphorous) will be used to standardize the NaOH solution.Approximately what …

1.calculare the final pressure of 0.8 g of hydrogen gas (H2) when stored in 20 L

1.calculare the final pressure of 0.8 g of hydrogen gas (H2) when stored in 20 L container at 27 degree Celsius. 2.What is the final volume of 0.3 moles of a gas which occupies 4.…

1.calculate the final concentration of a solution made by mixing 250.mL of 5.00

1.calculate the final concentration of a solution made by mixing 250.mL of 5.00 M HCl with enough water to make a final volume of 600.mL of solution 2.calculate the final concentr…

1.cinnamaldehyde; 2. 2-methoxycinnamaldehyde; 3. cinnamyl alcohol; 4. cinnamyl a

1.cinnamaldehyde; 2. 2-methoxycinnamaldehyde; 3. cinnamyl alcohol; 4. cinnamyl acetate; 5. cinnamic acid; 6. coumarin; 7. eugenol The flavour components of commercial cinnamon sam…

1.ethyl chloride is sold as a liquid under pressure for the use as a local skin

1.ethyl chloride is sold as a liquid under pressure for the use as a local skin anesthetic. ethyl cholride boils at 12 degree celsius at atmospheric pressure. When the liquid is s…

1.experiment shows that a 116 mL gas sample has a mass of 0.172 g at a pressure

1.experiment shows that a 116 mL gas sample has a mass of 0.172 g at a pressure of 717 mmHg and a temperature of 34 C. What is the molar mass of the gas? 2.A gas mixture with a to…

1.how many grams of fat are in one serving? 2.how many grams of carbohydrates ar

1.how many grams of fat are in one serving? 2.how many grams of carbohydrates are in one serving? 3. how many grams of protein are in one serving? Nutrition Facts Senang Sa® 1 (1 …

1.if a patient is receiving 125mL of 2.50% (m/v) mannitol every 2.00 hr how many

1.if a patient is receiving 125mL of 2.50% (m/v) mannitol every 2.00 hr how many grams of mannitol does the patient receive in 8.00 hr 2.how many grams of NH4Cl are in 1150mL of 4…

1.ii Methane and hydrogen diffuse through a porous membrane 4.0 x 10 m thick and

1.ii Methane and hydrogen diffuse through a porous membrane 4.0 x 10 m thick and 1 atm as shown in Figure 1-2. For each mole of methane diffusing through the membrane into the hyd…

1.ka for HF is 6.8x10^-4. calculate the kb for its conjugate base, the flouride

1.ka for HF is 6.8x10^-4. calculate the kb for its conjugate base, the flouride ion, F- 2. which of the following salts dissovled in water will form basic solutions? NH4Cl? Cu(No3…

1.natural gas is composed mostly of methane ,but it can contain significant amou

1.natural gas is composed mostly of methane ,but it can contain significant amounts (up to 20 %)of ethane ,C2H6;propane,C3H8; butane, C4H10; and carbon dioxide ,CO2.would the pres…

1.proteolytic enzyme is very much useful for digestion. Inside our body madeup o

1.proteolytic enzyme is very much useful for digestion. Inside our body madeup of protein chain (peptide), that enzyme will helps to cleave the peptide to aminoacid residue. 2. Th…

1.since for both the reaction, deltaG is -ve, the reactions are spontaneous. 2.

1.since for both the reaction, deltaG is -ve, the reactions are spontaneous. 2. for the reaction Pb(s)+CO(g) ------>PbO(s)+C(graphite) for solids in the elemental state, deltaG…

1.sp hybridization serves to ___________(raise/lower) the s orbital in energy an

1.sp hybridization serves to ___________(raise/lower) the s orbital in energy and ___________(raise/lower) the p orbital(s) in energy. 2. There are ______(a number) sp2 orbitals a…

1.state whether the substance is molecular, Ionic, Acid or Element. Write the fo

1.state whether the substance is molecular, Ionic, Acid or Element. Write the formula. 1.sodium chloride 2.calcium carbonate 3.nickel (111) bisulfate 4.sodium hydroxide 5.magnesiu…

1.what is the pH of a buffer prepared by adding .809 mol of weak acid Ha to 0.60

1.what is the pH of a buffer prepared by adding .809 mol of weak acid Ha to 0.609 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA= 5.66x10^-7 2. What is the p…

1.which of the following molecular cations has electrons in pi antibonding orbit

1.which of the following molecular cations has electrons in pi antibonding orbitals? a.N2+ b.O2+ c.(Br2)^2+ d.(C2)^2+ 2. what is the charge cloud(think SN) geometry of SF4? a.trig…

1.which one of the following will give a solution with a pH >7, but is not an Ar

1.which one of the following will give a solution with a pH >7, but is not an Arrhenius base in the strict sense? a) CH3NH2 b)NaOH c)CO2 d)Ca(OH)2 e)CH4 when the temperature of…

1.why do acids and bases conduct electricity? 2.which conducts electricity vette

1.why do acids and bases conduct electricity? 2.which conducts electricity vetter, HMnO4 or HF? 3.name 3 weak acids and describe what they are used for. 4.are organic acids weak a…