What is the BEST way to determine if a chemical change has occurred? 1. try and ignite the substance

2. examine the properties before and after the change

3. try and melt the substance

4. see if you can reverse the process

2. examine the properties before and after the change

hi my dude or dudette

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.