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15 Sep
2020

why the answers are B and A? Which of the following solutions would be…

Category:ACADEMICIAN

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why the answers are B and A? Which of the following solutions would be acidic? A. sodium acetate B. iron III chloride C. sodium carbonate D. potassium chloride Consider the following salts: I. NaF II. NaClO4 III. NaHSO4 Which of these salts, when dissolved in water, would form a basic solution? A. I only B. I and II only C. II and III only D. I, II and IIIHow we can understand if a solution is acidic or basic?
1. Which of the following is not an indication that a chemical reaction has occurred? (a) formation of liquid droplets
1. Which of the following is not an indication that a chemical reaction has occurred? (a) formation of liquid droplets above the solution (b) the solution color changing from clear to yellow (c) the solution color changing from brown to clear (d) formation of a silvery metallic foil on the walls of the flask Hi! I dont understand this question because i believe all of these are examples of chemical reactions. Answer choice a, is precipitation. Answer b and c, is an example of color change. Answer d, is an example of chemical change. Thanks!
The result of the following calculation has how many significant figures? (0.4333 J/g °C) (33.12°C – 31.12°C)(412.1 g). I know
The result of the following calculation has how many significant figures? (0.4333 J/g °C) (33.12°C – 31.12°C)(412.1 g). I know that the answer is supposed to be three by I am not sure how that answer is calculated. I thought that you can go off of the question without finding the final product but apparently I am wrong. Could you please explain so I have a better understanding?
Hello. Please see below for the question details. I need to verify the answers I got for each problem please
Hello. Please see below for the question details. I need to verify the answers I got for each problem please and thank you. 4.The summit of mount Everest is at 29,029 feet. At this elevation the atmosphere pressure is 30 kPa or about 0.30 atm. What is the boiling point of water at the top of mount Everest? What is the temperature (in degrees celsius) at the triple point for this substance?
1.- Al analizar una muestra de ácido muriático, 2 mL requieren 20 mL de hidróxido de sodio. Se pesó en
Chemistry Assignment Writing Service1.- Al analizar una muestra de ácido muriático, 2 mL requieren 20 mL de hidróxido de sodio. Se pesó en promedio 0.1032 g de estándar primario y se gastaron 5.02 mL. Calcula el porcentaje de HCl en la muestra. 2.- El calcio se determina gravimétricamente como oxalato de calcio en presencia de Mg2 . El oxalato de magnesio tiene un pKps= 4,1, sin embargo no precipita al tratarlo con un exceso de oxalato, debido la formación del ión complejo: Mg(C2O4)2 2- . Calcular la solubilidad del oxalato de magnesio en presencia de oxalato de sodio 1 M. Datos: Mg(C2O4)2 2- 2= 2,40 x 104 3.- Plantear cómo prepararía 500 mL de buffer NH3 (50mM)/NH4 de pH= 8,8 partiendo de una solución de NH3 5M y NH4Cl sólido. Datos: NH4 : pKa: 9,24 PM NH4Cl = 53,5
how would the fraction of successful collisions change with an increase in reaction temperature? A.) the fraction of successful collisions
how would the fraction of successful collisions change with an increase in reaction temperature? A.) the fraction of successful collisions would remain unchanged B.) the fraction of successful collisions would decreaseC.) the fraction of successful collisions would increaseD.) the fraction of successful collisions would approach zeroI think the answer is C
1.) Choose and explain which of the following pairs is the stronger acid. HNO322.)Mg(OH)2 or HNOComplete the following chemical reactions:
1.) Choose and explain which of the following pairs is the stronger acid. HNO322.)Mg(OH)2 or HNOComplete the following chemical reactions: 2 HCl →3.) Show the calculation of the pH of a 0.00275 M solution of the strong acid H2SO44.)Show the calculation of the [OH-] of a solution whose pH = 10.34.5.) In the titration of 0.127 grams of Al(OH)3 in the presence of bromothymol blue indicator, the blue solution turns yellow after 22.3 mL of H2SO4 of unknown concentration is added. Show the calculation of the molarity of the H2SO4 solution6.)Show the calculation of the value of Ka for propionic acid (HC3H5O2), if the pH of a 0.115 M solution is 2.917.)Show the calculation of the [OH-], pH and % ionization for 0.118 M ammonia (NH3), if Kb = 1.8 x 10-58.) Predict whether solutions of the following salts are acidic, basic or neutral and explain your answer:ZnSO4 NaCN9.) What is the pH of 1.00 L of a buffer containing 0.110 M NH4Cl and 0.110 M NH3? (2) What will the pH be upon addition of 0.0200 mole HCl to 1.00 L of the buffer? (3) What will the pH be upon addition of 0.0200 mole NaOH to 1.00 L of the buffer? Show your work. NH3 H2O (liq) NH4 OH- Kb = 1.8 x 10-510.)List and explain what type of acid and base are involved in the titration curve below and select an appropriate indicator to be used in this titration from the list below.
The reaction between ethylene and hydrogen bromide to form ethyl bromide is carried out in a continuous reactor. The product
The reaction between ethylene and hydrogen bromide to form ethyl bromide is carried out in a continuous reactor. The product stream is analyzed and found to contain 51.7 mole% C2H5Br and 17.3% HBr. The feed to the reactor contains only ethylene and hydrogen bromide. If the molar flow rate of the feed stream is 160 mol/s,a) Calculate the molar composition of the feed into the reactor, to 3 decimal places.b) Based on your answer in a), identify the limiting reactant.c) Calculate the fractional conversion of the limiting reactant, to 3 decimal places.d) Calculate the percentage by which the other reactant is in excess, to 1 decimal place.e) What is the extent of reaction, in mol/s? Give your answer in 2 decimal places.

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