Answers created by Ernest Z.

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• All the reactions are correct , so what could be the appropriate answer then?
  
• To show that you are justified in using [OH-] as a constant: using concentrations from Run 1, show that the concentration of NaOH has changed insignificantly when half of a CV chloride has been consumed?
  
• What are the factors that make amphoteric oxides able to react with both acids and alkalis?
  
• What is the mechanism for the following reaction?
  
• 2.00 grams of a straight-chained hydrocarbon contains 1.68grams of carbon, the rest hydrogen. 1. Calculate the empirical formula of this hydrocarbon.?
  
• A chemist runs a chemical reaction at 15°C and decides that it proceeds far too slowly. As a result, he decides that the reaction rate must be increased by a factor of 16. At what temperature should the chemist run the reaction to achieve this goal?
  
• A chemist runs a reaction at 65°C and determines its rate to be 0.000364 M/s. If she decreases the temperature to 25°C, what will the rate of the reaction be?
  
• What is the molality of a 1M NaOH solution?
  
• How many kilojoules of hear are required to melt a 10.9 gram Popsicle at 0 degrees Celsius & 101.3 kPa? Assume the Popsicle has the same molar mass and heat capacity of water
  
• Will you help me finish up this question?
  
• If 20 grams of ice at 0°C is added to 120 grams of water at 49°C, what is the temperature of the mixture?
  
• Some water and 270g of ice is given the same amount of heat. What amount of water can be vapoured by the time the ice melts fully?
  
• Why do oil droplets lose an electron when they drop in Millikan's oil drop experiment?
  
• A compound contains 4.07% H, 24.27% C, and the remaining is chlorine. Its molar mass is 98.96 g/mol. What are its empirical formula and molecular formula?
  
• What is the most likely product to form when 4-methyl-1-pentene reacts with excess Br2? Please show the structural formula. What type of reaction is this?
  
• Calculate how many grams of the product form when 16.7 g of calcium metal completely reacts. Assume that there is more than enough of the chlorine gas? Ca(s) + Cl2(g) → CaCl2(s) please help me ...
  
• Calculate amount of formic acid (ka=2*10-4) which shoud be dissolved in 10L of water to obtain a solution of pH=3.7?
  
• To account for atomic mass of nitrogen is as 14.0067 , what should be the ratio of N-15 and N-14 atoms in natural nitrogen (atomic mass of N 14 is 14.00307u and N 15 is 15.001?
  
• The freezing point of 1% aqueous solution of calcium nitrate will be?
  
• Which ion has the largest radius? #"Na"^(+)#, #"Ga"^(3+)#, #"K"^(+)#, #"Mg"^(2+)#, #"Ca"^(2+)#
  
• Theoretical Yield?
  
• You have 40g of sodium chloride. What is the minimum amount of water required to dissolve the salt at 30oC?
  
• HA is a weak acid. A 0.21M solution of HA has a pH of 2.68. What is the Ka value for HA?
  
• Formic (or methanoic) acid is a weak acid secreted by ants as a defence mechanism. The acid has a Ka value of 1.8 x 10-4. What is the pH of a 1.65M solution of formic acid?
  
• How do unit conversions work?
  
• . Please help me with a chemistry question????
  
• A 1.00 L flask contains nitrogen gas. what is the final partial pressure?
  
• Why teritary amine can't show chirality?
  
• Radium emits (8.4*10¹⁰) ⋉ particle/gm/s and thus produces 'He' gas at the rate of 1.69*10⁻⁴ ml/gm/day at NTP. So what is the value of 'avogadro number'?
  
• How to convert toluene to P-Methyl benzoic acid ?
  
• How does CFC and NO2 deplete ozone layer? Explain it wih balanced chemical equation?
  
• At what temperature are potassium chloride and potassium chlorate equally soluble?
  
• How are ethers containing alkenes named ?
  
• A solution is prepared by dissolving 5.6 g of KOH is 250 ml of it. Calculate the molarity of the solution?(molar mass KOH: 56 g/ mol) [Ans. : 419M]
  
• A student used 0.1611 g of aluminum with excess HCl. This produced 205.1 mL of hydrogen gas. Atmospheric pressure was 754.7 torr and room temperature that day was 20.5 degrees Celsius?
  
• Examples of some compounds which exhibits planar geometry?
  
• Please help me with this question..... a)Polyethylene exists either as a linear (straight-chain) polymer or as a branched polymer. Which is the high density form? Explain.
  
• 1.00mol of propene sample is placed in an oxygen filled calorimeter and burned. The starting temperature of the calorimeter is 25.00°C and its total heat capacity is 97.1kJ/°C. The temperature of the calorimeter increased to 27.282°C. Find a), b) and c)?
  
• If the radius of Bohr's orbit is x, then de Broglie wavelength of the electron in 3rd orbit is nearly?
  
• Another chemistry question over thermodynamics?
  
• A substance in an aqueous solution at a concentration of 0.01M shows an optical transmittance of 28% with a path length of 2mm calculate the molar absorption coefficient of the solute? What would be the transmittance in a cell of 1cm thick?
  
• Number of structural isomers possible in C3H6O ???
  
• What is equivalent weight of H2O2 in decomposition reaction?
  
• List out the symmetry elements of ch3cl?
  
• What is the standard enthalpy change for the reaction?
  
• What charge would be needed on F2 to generate an ion with a bond order of 2?
  
• A gas stream containing 45wt% butane and 55wt% pentane is subjected to heating from 180K to 260K at constant pressure. calculate the required heat input per kg of this mixture?
  
• What will be the equivalent weight of #KClO_3# in the following equation ?
  
• Assuming it is possible to create an acid anhydride from two different carboxylic acids (ie. one carboxylic acid molecule from each each per anhydride molecule), how would you name it?
  
• Calculate total number of optical isomers in the following compound CH3(CHOH)3CH3 ??
  
• What will be the equivalent weight of #KClO_3# in the following equation ?
  
• How do I do this chemistry quick lab on limiting reactants?
  
• The enzyme range present in the human body is 25-35°C. How is it possible they are working properly within the temp of 37°C as they are temperature specific? Thanks.
  
• 1.00 g of oxygen react with 0.126 g of hydrogen to form #"H"_2"O"# and 1.00 g of nitrogen react with 0.216 g of hydrogen to form #"NH"_3"#. Predict the amount of oxygen when it reacts with 1.00 g of nitrogen to form an oxide?
  
• Identify ‘Y’?
  
• Calculate the percent phosphorus?
  
• Two samples at liquid as x and y boils at 100 degree Celsius and 103 degree Celsius which sample of liquid will freeze at 0 degree Celsius and Why?
  
• A ionic compound XY contains 0.050 mol of H2O for every 0.00998mol of ionic compound. The generalized formula for the hydrate is.....?
  
• We can liquefy oxygen and nitrogen gas but not carbon dioxide . WHY ???
  
• How chlorobenzene is obtained from aniline?
  
• Reaction mechanism of desulphonation of benzene ring using dil. #"HCl"# and, #"H"_2"SO"_4//150^@c# "?"
  
• Can any one help me with these question?
  
• Describe all 4 quantum numbers for last electron of 3d^5?
  
• Ice crystallises in a hexagonal lattice having the volume of unit cell as 132 × 10–24 cm3. If density is 0.92 g cm–3 at a given temperature, then what is the number of H2O molecules per unit cell?
  
• A 9.380 mol sample of nitrogen gas is maintained in a 0.8198 L container at 301.8 K. What is the pressure in atm calculated using the van der Waals' equation for N2 gas under these conditions? For N2, a = 1.390 L2atm/mol2 and b = 3.910×10-2 L/mol. atm?
  
• How many atoms are in a gram of air?
  
• 4.74 gm of CuO when heated with current of H2 gave 3.78 gm of metal.Find the Equivalent mass of Cu?
  
• 0.796 gm of metal oxide when heated with current of dry H2 , 0.18 gm of H2O was found.he equivalent mass of metal?
  
• How do I match these fermentation terms?
  
• Can someone please tell what this model represents?
  
• How to calculate the ratio of sodium carbonate and sodium bicarbonate in 'x' Molar sodium carbonate-sodium biocarbonate buffer?
  
• What is the pH of the unknown solution?
  
• At 25 degree Celsius, 190 grams of glucose is dissolved in 1000 grams of water. For this solution which of the following is correct ? a. M=m b. M > m c. M < m d. M is independent of m
  
• What's the length of the diagonal of a 12 cm x 13 cm x 5 cm rectangular prism to the nearest tenth?
  
• The reaction needs a protection step. Give full reaction, including protection and deprotection steps?
  
• How do you calculate the mass of ethanol that must be burnt to increase the temperature of #210 g# of water by #65^@#, if exactly half of the heat released by this combustion is lost to the surroundings?
  
• A compound containing Na, S, H, and O where, Na =14.28 %, S = 9.92%, H = 6.2% and the rest are O. The molecular mass of the compound is 322. Calculate the molecular formula of compound considering all H atoms are present as water of crystallization?
  
• What is Wrong with this name? (hint-draw the molecule out first) 3-butene
  
• What is the molarity of 3.5 wt % NaCl dissolved in 1000 mL of distilled water?
  
• What happens when you mix Magnesium Nitrate and Potassium Iodide together?
  
• How do I match these carbohydrates and energy terms?
  
• How many milliliters of 0.125 M Ba(OH)2(aq) must be used to produce 5.5 moles of water? Please balance the equation before solving the problem.
  
• How many grams of silver chromate are produced when 250. mL of 1.500 M Na2CrO4 are added to excess silver nitrate? Please balance the equation before solving the problem.
  
• What is the molality of a 15.0 M solution of phosphoric acid with a density of 1.65 g/mL?
  
• What is the IUPAC name of the given compound?
  
• How can you carry out this conversion?
  
• An aqueous solution containing 1.00 g of bovine insulin (a protein, not ionized) per liter has an osmotic pressure of 3.1 mm Hg at 25 °C. How do you calculate the molar mass of bovine insulin?
  
• How can i prepare Dofetalide ?
  
• Suppose 10.00mL of a hydrochloric acid solution with a pH of 1.097 is titrated with a sodium hydroxide with a pH of 13.00. How many mL of the sodium hydroxide solution will be required to neutralize the acid?
  
• What is the volume occupied by a mole of an ideal gas, if the pressure is 626 mm Hg and the temperature is 25.0 degrees Celsius?
  
• If a liter of solution is needed, how many grams of ethanol, C2H6O will be added when a scientist creates a 0.25 molal solution?
  
• Why do halogens do not add to double bond in allylic halogenation?
  
• Aluminum acetate reacts with sodium iodide. If starting with 6.19 milligrams of aluminum acetate, how many grams of sodium iodide are required ?
  
• My question is from a chemistry assignment Describe the structure and bonding associated with C3 of pent-2-ene? Thanks in advance!
  
• What reagents are necessary to carry out the following reaction?
  
• Assigned oxidation States to atoms underlined in the compound (NH4)2HPO4?
  
• 5) Sometimes secondary amines, such as pyrrolidine, are used in the alkylation of carbonyl compounds (cf. figure below). a) What problem is minimized using pyrrolidine? b) Give detailed mechanisms for all steps in the alkylation of cyclohexanone using pyr
  
• What volume of 70,000ppm of CO2 does this represent in a room of 50dm^3 of air?
  
• How do I match these cell energetics terms?
  
• What is difference between pyrine and pyrimidine????.......
  
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