Which of these is common to all chemical changes?

a)
a change of state occurs.

b)
a change of color occurs.

c)
a new substance is produced.

d)
heat is released into the air.

Option (C) is the correct answer.

Explanation:

A chemical change is a change which brings change in chemical composition of a substance or reactant(s).

Thus, we can say the due to change in composition we get a new product.

For example,

That is, NaCl is the new product formed.

Hence, we can conclude that common to all chemical changes is that a new substance is produced.  

passing a magnet thought the

mixture , because iron gets attracted to magnet .

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .