Question

Which of the following techniques will not be used in the Ferrofluid experiment?

---------

decanting

pipetting

vacuum filtration

centrifuging

Which of the follow is not true about ferrofluids?

---------

Ferrofluid has the fluid properties of water and the magnetic properties of magnetite.

The particle size of the magnetite is in the microscale range

The magnetite in the ferrofluid will permanently stain clothing.

The properties of the ferrofluid are extremely sensitive to the care and precision with which the procedure is followed.

Creating the correct particle size of magnetite depends on which step of the procedure?

--------- The stirring of the FeCl2·4H2O and FeCl3 solutions.

Decanting the clear liquid from the black precipitate The addition of cyclohexane to the weigh boat containing the black aqueous solution.

The addition of NH3 slowly (dropwise)

Which of the following should you avoid doing when using the Nd2Fe12B magnet? Select all that apply.

Putting the magnet near any electronic device

Placing the magnet near any other metal surface.

Stacking magnets on top of each other

Putting the magnet in your pocket

When inserting the filter paper for gravity filtration, place the paper in the funnel with the tear _____

--------

on the outside

on the inside

Answer 1

1. The techniques will not be used in ferrofluid experiment is

Vacuum filtration. (Filtration is not required as ferrofluids are suspension and on filtration, magnetite will separate out)

2. The statement is not true about ferrofluids is

The particle size of the magnetite is in the microscale range (The particles are in nanoscale range)

.3. Creating the correct particle size of magnetite depends on which step of the procedure?

The stirring of the FeCl2·4H2O and FeCl3 solutions. (stirring will help in homogenizing also to create uniform suspension)

4. Which of the following should you avoid doing when using the Nd2Fe12B magnet?

Putting the magnet near any electronic device

Placing the magnet near any other metal surface.

5. When inserting the filter paper for gravity filtration, place the paper in the funnel with the tear

on the inside