10 points
Which answer choice below represents the Law of Conservation of
mass? *
Which of the following is true about the law of conservation of mass?
A
Matter must first be destroyed in order to be created.
B
The mass of the products is always less than the mass of the
reactants.
C
The mass of the reactants must always equal the mass of the
products.
D
The mass of the products is always greater than the mass of
the reactants.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

a is the correct answer