Chemistry concepts and calculations

A certain shade of blue has a frequency of 7.35 × 1014 Hz. What is the energy of

A certain shade of blue has a frequency of 7.35 × 1014 Hz. What is the energy of exactly one photon of this light? The minimum frequency of light needed to eject electrons from a …

A certain species of animal has a population of 1 animal per 1 km^2 a) if the po

A certain species of animal has a population of 1 animal per 1 km^2 a) if the population growth rate is maintained at 10% per 10 years, how long would it take for the population t…

A certain subatomic particle is discovered. It is comprised of a charm quark and

A certain subatomic particle is discovered. It is comprised of a charm quark and an anti-bottom quark. Map Answer the three questions below. Part A How would this new particle be …

A certain substance X has a normal boiling point of 101.5°C and a molar boiling

A certain substance X has a normal boiling point of 101.5°C and a molar boiling point elevation constant Kb = 1.49 °C/m. A solution is prepared by dissolving some urea (NH2)2CO in…

A certain substance has a heat of vaporization of 57.85kJ/mol. At what kelvin te

A certain substance has a heat of vaporization of 57.85kJ/mol. At what kelvin temperature will the vapor pressure be 4.00 times higher than it was at 307 K? I need help solving an…

A certain substance has a heat of vaporization of 57.85kJ/mol. At what kelvin te

A certain substance has a heat of vaporization of 57.85kJ/mol. At what kelvin temperature will the vapor pressure be 4.00 times higher than it was at 307 K? I need help solving an…

A certain substance has a molar mass (to 2 significant gmol·Which ofthe followin

A certain substance has a molar mass (to 2 significant gmol·Which ofthe following is not a possible formula? A CHo C CH B Si D CO 4 0.200 moles of a substance has a mass of 27.0 g…

A certain substance has a molar mass (to 2 significant gmol·Which ofthe followin

A certain substance has a molar mass (to 2 significant gmol·Which ofthe following is not a possible formula? A CHo C CH B Si D CO 4 0.200 moles of a substance has a mass of 27.0 g…

A certain substance has a normal boiling point of and a molal boiling point elev

A certain substance has a normal boiling point of and a molal boiling point elevation constant... (see image) Please round to appropriate significant digits. A certain substance X…

A certain substance is a liquid at a temperature of -25 o C and a pressure of 1

A certain substance is a liquid at a temperature of -25oC and a pressure of 1 atm. Only one of the following can be correct for the phase diagram of this substance. Which one is c…

A certain toaster has a heating element made of Nichrome wire. When the toaster

A certain toaster has a heating element made of Nichrome wire. When the toaster is first connected to a 120-V source (and the wire is at a temperature of 20.0°c), the initial curr…

A certain volatile hydrocarbon (a binary compound of carbon and hydrogen) is fou

A certain volatile hydrocarbon (a binary compound of carbon and hydrogen) is found to be 92.3% carbon by mass. In a seperate experiment, utilizing the Dumas method, a 4.00 mL pure…

A certain volatile hydrocarbon (a binary compound of carbon and hydrogen) is fou

A certain volatile hydrocarbon (a binary compound of carbon and hydrogen) is found to be 92.3 % carbon, by mass. In a separate experiment, utilizing the Dumas method, a 4.00 mL pu…

A certain weak acid HA has Ka=2.4 x 10-2. Calculate the pH of 0.150 M HA solutio

A certain weak acid HA has Ka=2.4 x 10-2. Calculate the pH of 0.150 M HA solution. Possible answers: a. 1.31 b. 1.22 c. 1.62 d. 8.54 (obviously not since its a weak ACID solution)…

A certain weak acid HA has Ka=2.4 x 10-2. Calculate the pH of 0.150 M HA solutio

A certain weak acid HA has Ka=2.4 x 10-2. Calculate the pH of 0.150 M HA solution. Possible answers: a. 1.31 b. 1.22 c. 1.62 d. 8.54 (obviously not since its a weak ACID solution)…

A certain weak acid, HA, has a K_a value of 5.4 Times 10^-7. Calculate the perce

A certain weak acid, HA, has a K_a value of 5.4 Times 10^-7. Calculate the percent dissociation of HA in a 0.10 M solution. Express your answer as a percent using two significant …

A certain weak acid, HA, has a Ka value of 9.9x10^-7 1. Calculate the percent di

A certain weak acid, HA, has a Ka value of 9.9x10^-7 1. Calculate the percent dissociation of HA in a 0.10 M solution 2. Calculate the percent dissociation of HA in a 0.010 M solu…

A certain weak acid, HA, with a Ka value of 5.61×106, is titrated with NaOH. Par

A certain weak acid, HA, with a Ka value of 5.61×106, is titrated with NaOH. Part: A A solution is made by titrating 8.00 mmol (millimoles) of HA and 3.00 mmol of the strong base.…

A certified organic grower plans to grow a crop that requires the application of

A certified organic grower plans to grow a crop that requires the application of 120 kg of plant-available N/ha and 20 kg/ha of P. She has a source of compost that contains 1.5% t…

A chain growth Polymerization requires an initiator. Can any material be used as

A chain growth Polymerization requires an initiator. Can any material be used as an initiator? What kinds of molecules are usually used as an initiator and why are they preferred?…

A change in concentration increases the rate of a certain forward reaction more

A change in concentration increases the rate of a certain forward reaction more than that of the reverse reaction. What is the effect on the equilibrium constant and the concentra…

A change in temperature from 10°C to 20°C is found todouble the rate of a partic

A change in temperature from 10°C to 20°C is found todouble the rate of a particular chemical reaction. How did thischange in temperature affect the reacting molecules? A. The ave…

A change in the primary sequence of a protein will never change how a protein is

A change in the primary sequence of a protein will never change how a protein is allosteric regulated. a.) True b.) False Which of the following is NOT a mechanism of enzyme regul…

A characteristic of a carbocation is that it will rearrange to a more stable act

A characteristic of a carbocation is that it will rearrange to a more stable action if possible, it will add a nucleophile if one is available, it will eliminate a proton in the p…

A charged paint is spread in a very thin uniform layer over the surface of a pla

A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 12.0 cm , giving it a charge of -59.0 C . Find the electric field just outs…

A charged particle of mass m3.8 x 10-6 kg moves through a 0.8-m long velocity se

A charged particle of mass m3.8 x 10-6 kg moves through a 0.8-m long velocity selector as shown in the figure below E, B A top view of the problem where q enters from the left. Th…

A charged particles has a mass of 8 mg and a charge of + 5 MC. The particle is s

A charged particles has a mass of 8 mg and a charge of + 5 MC. The particle is shot between the charged plates shown with an initial speed of 300 m/s. The electric field E between…

A chem student named A. Hayes determines the mass of anunknown gas to be 6.84 gr

A chem student named A. Hayes determines the mass of anunknown gas to be 6.84 grams at 25 degrees celsius and 740 mm Hg ina 3.0 L container. What is the molecular mass of the unkn…

A chemical analysis of a water sample (pH 7) yields the following data: Ion Conc

A chemical analysis of a water sample (pH 7) yields the following data: Ion Concentration (mg/L) Ca2+ 70 Mg2+ 40 Na+ 10 HCO3 - 150 SO4 2- 120 Cl- 60 a) Calculate the total hardnes…

A chemical bond is a strong attraction between two or more atoms. Can you identi

A chemical bond is a strong attraction between two or more atoms. Can you identify the properties of different types of chemical bonds? g the terms on the left to the appropriate …

A chemical bond is formed by the transfer of one or more valence electrons. What

A chemical bond is formed by the transfer of one or more valence electrons. What type of bond is generated this way? Covalent bond Dative covalent bond Metallic Bond Ionic Bond Hy…

A chemical engineer determines the mass percent of iron in an unkown iron oxide

A chemical engineer determines the mass percent of iron in an unkown iron oxide sample by converting Fe2+ (aq) in acid, then titrating the Fe2+ with MnO4-(aq).The unbalanced equat…

A chemical engineer is conducting a pilot plant study to examine the economic fe

A chemical engineer is conducting a pilot plant study to examine the economic feasibility of anaerobically fermenting grain to form ethanol and acrylic acid, two high-value produc…

A chemical engineer is studying he two reactions shown in the table below. In ea

A chemical engineer is studying he two reactions shown in the table below. In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant t…

A chemical engineer is studying he two reactions shown in the table below. In ea

A chemical engineer is studying he two reactions shown in the table below. In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant t…

A chemical engineer is studying the following reaction: H 2 (g) + Cl 2 (g) right

A chemical engineer is studying the following reaction: H 2 (g) + Cl 2 (g) rightarrow 2HCl (g) M the temperature the engineer picks, the equilibrium constant K for this reaction i…

A chemical engineer is studying the following reaction: H 2 (g) + Cl 2 (g) right

A chemical engineer is studying the following reaction: H 2 (g) + Cl 2 (g) rightarrow 2HCl (g) M the temperature the engineer picks, the equilibrium constant K for this reaction i…

A chemical engineer is studying the following reaction: HCH 3 CO 2(aq)\" CH 3 NH

A chemical engineer is studying the following reaction: HCH 3 CO 2(aq)" CH 3 NH 2(aq) CH 3 CO 2 (aq)+CH,NH;(aq) At the temperature the engineer picks, the equilibrium constant K f…

A chemical engineer is studying the rate ct this reaction. 2HI(g) rightarrow H2(

A chemical engineer is studying the rate ct this reaction. 2HI(g) rightarrow H2(g) + I2(g) He fills a reaction vessel with HI and measures its concentration as the reaction procee…

A chemical engineer is studying the rate of this reaction 201,05 (g) 2Cl-(g) + 5

A chemical engineer is studying the rate of this reaction 201,05 (g) 2Cl-(g) + 502 (g) He fills a reaction vessel with Cl,O and measures its concentration as the reaction proceeds…

A chemical engineer is studying the rate of this reaction. 2Cl_2O_5(g) rightarro

A chemical engineer is studying the rate of this reaction. 2Cl_2O_5(g) rightarrow 2Cl_2(g) + 5O_2(g) He fills a reaction vessel with Cl_2O_5 and measures its concentration as the …

A chemical engineer is studying the two reactions shown in the table below. In e

A chemical engineer is studying the two reactions shown in the table below. In each case, he fills a reaction v with some mixture of the reactants and products at a constant tempe…

A chemical engineer is studying the two reactions shown in the table below. In e

A chemical engineer is studying the two reactions shown in the table below. In each case, he fills a reaction vessel with some mioture of the reactants and products at a constant …