General Chemistry Answers

An aqueous solution of salts, macromolecules and microbes is

fed across a reverse osmosis membrane, an ultrafiltration

membrane and a microfiltration in that order. What do the three

permeates contain?

Find out more about the production of a common breakfast food

or drink product such as margarine, sugar, instant coffee or

cornflakes, and list the separation processes important to its

production.

In chemical engineering it is often necessary to make estimates

using incomplete data. Estimate the relative effective capacity of

the following two liquids for absorbing carbon dioxide: (a)

monoethanolamine solution (20 per cent by weight), and (b)

water at various pressures. The MEA absorptive capacity is in

practice limited to 0.35 moles of carbon dioxide per mole of

amine. The solubility of carbon dioxide in water at 20°C is about

0.039 mollitre- 1 bar.

If all of the catalysts used in the ammonia process could be

replaced by catalysts whose performance was unaffected by the presence of hydrogen sulphide, would it still need to be sepa-

rated out? If 'yes', suggest the type and location of the chosen

separation stage.

Write the chemical symbols for three different atomic anions that all have 6 protons

A solubility of a salt is 80g in 100g of water at 100 degree Celsius and 20g in 100g of water at 25 degree Celsius. What mass of salt would crystallize if 50g of the salt solution saturated at 100 degree Celsius were cooled at 25 degree Celsius

What volume will 12.0 g of oxygen gas (O,)

occupy at 25°C and a pressure of 52.7 kPa?

Consider a buffer made up of 0.10 M H2PO4^- and 0.32 M HPO4^2-. The Ka of H2PO4^- is 6.2x10^-8. What is the resulting pH when 1 liter of the buffer is mixed with 0.01 mol HClO4? Assume no change in volume occurs upon addition of the acid.

A. 8.54

B. 6.76

C. 7.66

D. 8.43

If we dissolve CaCO3 in water, we get the following equilibrium:

CO3^2-(aq)+H2O(l) =HCO3^-(aq) + OH^-(aq)

0.675 grams of calcium carbonate is dissolved in enoughwater to make 500 mL of solution. The MW of CaCO3 is 100 g/mol and the Kb of CO3^2- is 2.1x10^-4. What is the initial concentration of the carbonate ion?

What is the equilibrium concentration of the hydroxide ion?

What is the pOH of the solution?

What is the pH of the solution?

What must be the ratio of F- concentration to HF to make a buffer with a pH of 4? pKa = 3.2

a. 0.16

b. 2.4

c. 6.3

d.8.1

What does the energy in electron is quantized mean?