Posted by tom on Saturday, October 6, 2012 at 8:53am.
I wonder what your teacher thinks is the big idea of energy?
To me, it is that "matter and energy are equivalent, and may be interchanged with each other in transformation, but the sum total of energy and mass equivalent is constant in the universe"
That is indeed a big idea.
So within that big idea, if magnesium "burns", and give off heat, some of its mass (albeit many billionths of a nanogram) has changed into energy.
I suspect your teacher has a lessor big idea, and I have no clue.
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