4 Fe + 3 02 2 Fe2 O3

In this chemical equation, why is the number of atoms the same on each side of the arrow?

Chemical reactions reduce matter but create energy.
Chemical reactions produce new matter.
Matter cannot be created or destroyed.

Matter cannot be created or destroyed.

Explanation:

According to law of conservation of matter, Matter can neither be created nor destroyed. It just gets converted into other forms.

So, It's important to equalize the no. of moles on either side of the chemical reaction.

Hope this helped!

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.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.