- How many grams of H2 (g) will be released when 18g of water react in the following reaction:

2K(s) + 2H, O(1) ► 2KOH(aq) + H2(g)

Could you explain why?

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

it is b that is the answer.