What is the big idea of energy?????

It says : for level 6:

"Explained the reaction using the big idea of energy"

what does it mean by the big idea of energy????

Answer: the Energy between the atmos collided, resulting in a chemical bond of these two elements, creating a compound.

-Tobas 17 yrs old.

http://www.pbs.org/wgbh/nova/einstein/legacy.html

That the sum total of energy and matter in the universe is constant, but that matter and energy are equivalent, and can be interchanged with each other.

The doesnt really help...

If it does, how do I use it to explain what happens when magnesium burns?

Have you got the same stupid homework as me?

it says on my sheet that for lvl 7 i have to use symbols from a peridoic table to get a symbol equasion? does that mean stuff like C02 and stuff? And plz explaing what u mean by the total of energy something something with each other-i don't really get it much

arghhh! i don't get it when it says "explain the reaction using the big idea of energy!"

and what happenes when you mix sulphur and iron together with a cotton ball jammed in the test tube??????

I know it turns black but why does there have to be cotton wool blocking it????!!!!
!?!?!?!?!?!?!?!?!?!?!!?!?!??!??!!?!?!???!!?
And do i needed to see what happens when i heat it up-or do i need o mix the together?
cos it has a piocture of a puddle with little black beans in it-
supposedly suphur and iron filings

to NHHS

yes it probably is the same sheet.
I've done it now so it doesn't matter...

yeah it does mean CO2 but it was
2Mg + O2 --> 2MgO

Im really confuzzled to! I have no idea what my teacher is going on about! What on earth does "the big idea of energy" mean? HELP!!!

I am really stuck on this piece i have done my particle model now on why sustances classified as an element and why there are same particles at the end and the begining Can anyone help me out

i need help with an answer which is level 6 do use a partical modle in detail how magnisium burns