Answer:
Hydrogen
Explanation:
Hydrogen, most abundant in the universe, is the chemical element with atomic number 1, and an atomic mass of 1.00794 amu, the lightest of all known elements. It exists as a diatomic gas (H2).
Answer:
the conservation of mass means matter can be created or destroyed, it only changes forms
Explanation:
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The answer is A: the PH scale
7 grams of Oxygen. The Law of conservation of mass says that mass can be neither created nor destroyed, so the total mass of the products (in this case the oxygen plus the mercury) must equal the total mass of the reactants (in this case, the mercuric oxide).
It's not a food web it's a food chain. I just did the exam a few minutes ago. Please mark it Brainliest.
