General Chemistry Answers

I performed an extraction of caffeine from tea/coffee experiment and in of the last steps where I added a drying agent (Sodium Sulphate) into the DCM solution (containing caffeine after extraction and filtering), there were really cold crystals formed on the filter paper. Why did it happen and what was the cause of it?

Thank you

Write the balanced equation for the reaction of lead(II) nitrate (aq) with sodium iodide (aq) to form lead(II) iodide precipitate and sodium nitrate solution

If 150 grams of vinegar( HC2H302) react with egg shell at 641 mmHg and 16 degree Celsius, what will be the volume of vinegar that was used

As a chemical engineer you need to pump the products without affecting products properties.

Because the flow properties will affect the fluid properties of the products like density and

viscosity. Pumping without destroying product integrity is as important as the heat

exchanger that comes after the pump. The piston pumps can handle very delicate and

viscous food stuffs and can pump up to very high pressure without damaging the food

particles. It can also be applied very successfully in heavy duty applications for industries

other than the food industry.

Answer the following

·      1-Collect the information from various resources and use the collected data to formulate & solve the problem.

As a chemical engineer you need to pump the products without affecting products properties.

Because the flow properties will affect the fluid properties of the products like density and

viscosity. Pumping without destroying product integrity is as important as the heat

exchanger that comes after the pump. The piston pumps can handle very delicate and

viscous food stuffs and can pump up to very high pressure without damaging the food

particles. It can also be applied very successfully in heavy duty applications for industries

other than the food industry.

Answer the following

Pump Can work empty (without product)

1.• Allows high pressure drop (20 bar)

2-• Can work under vacuum

3-• Is self-priming

As a chemical engineer you need to pump the products without affecting products properties.

Because the flow properties will affect the fluid properties of the products like density and

viscosity. Pumping without destroying product integrity is as important as the heat

exchanger that comes after the pump. The piston pumps can handle very delicate and

viscous food stuffs and can pump up to very high pressure without damaging the food

particles. It can also be applied very successfully in heavy duty applications for industries

other than the food industry.

Answer the following

1-Collect the information from various resources and use the collected data to

formulate &solve the problem.

2-·      Does not break the product

3-     Delivers high flow rates (up to 20 m³/hr)

X and Y are two light grey metals. On reacting metal X with a blue copper solution, the solution becomes colourless and a reddish brown deposit is formed. But on reacting Y with the same solution, the blue colour persists. Write your observation for the following - X + YNO3 and Y + XNO3

Balance this equation for charge: NO2– + 2OH– ----> NO3– + H2O

What is the limiting reagent? How much sodium chloride can be formed with 23 grams of iron chloride?

3FeCl₂ +2Na₃PO₄ -> Fe₃ (PO₄)₂ + 6NaCl

Explain in terms of their structures, why C12H26 has a higher boiling point than C8H18