Questions involving expanding universe and certain laws of physics.

No mass is lost in chemical reactions. In the case of your car, the mass turns into exhaust gases of an equivalent mass of the gasoline you started with.

untrue, combustion of hydrocarbons in an exothermic reaction where it's equation boils down to reactants = products + energy. Therefore, some of the gasoline is converted into energy and a loss of mass

Originally posted by Paladin327

No mass is lost in chemical reactions. In the case of your car, the mass turns into exhaust gases of an equivalent mass of the gasoline you started with.

untrue, combustion of hydrocarbons in an exothermic reaction where it's equation boils down to reactants = products + energy. Therefore, some of the gasoline is converted into energy and a loss of mass

The vast majority (in fact all the measurable amount) of energy in chemical reactions comes from changes in bond energy. You're simply releasing energy that stored in the chemical bonds.

Converting the nucleus of an atom as in fusion is entirely different and actually results in a conversion of mass into energy.

Exactly, NA!

A tornado striking a house causes an apparent loss of mass. However, if you could collect all of the tiniest bits of debris, the mass remains constant, in spite of the energy trasnformation of the matrix of the mass.

Bruning a house would appear to also cause an apparent loss of mass. However, if you could collect every molecule of "debris," the entire mass would be accounted for.

Plants that operate photosynthesis do not create new mass, but simply uses the energy of the light to transform the chemicals around them into a collected mass, with that energy stored in chemical bonds within the products they create. It is that energy that is released in any subsequent chemical reactions.