Brainliesttt ! : )

when potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2k(s) + 2h2o(l) → 2koh(aq) + h2(g). your lab partner says this is a redox reaction and a combustion reaction. do you agree? defend your answer by explaining whether or not it meets the requirements of each type of reaction.

Redox but not combustion

Explanation:

2K(s) + 2H₂O(l) → 2KOH(aq) + H₂(g)

This is a redox reaction, because the oxidation number of K increases from 0 to +1, while that of H decreases from +1 to 0.

It is not a combustion reaction, because combustion is the reaction

with O₂.

The equation for the combustion of potassium would be

4K(s) + O₂(g) ⟶ 2K₂O(s)

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 .

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.