1. if the concentration of substance A of a reversible reaction in dynamic equilibrium decreases, how will the equilibrium change?

A. It will shift towards the products.
B. It will not change.
C. It will shift to create less of substance A.
D. It will shift to create more of substance A.
2.
Equilibrium occurs in what type of reactions?

A. Irreversible
B. Catalytic
C. Combustion
D. Reversible

your mom.com . : 0000

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

yes the answer is total mass in unchanged   : )