How to separate a mixture of iron dust and zinc dust

first u find the two different solvent of composite material(in composite material any one can be disperse solvent) then u separate (filter the solution)

Using a Magnet.

Explanation:

With the aid of a magnet that is held slightly above the mixture, the iron dust sticks to magnet, leaving the zinc dust behind.

the answer is   c.) 1575 j.

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.