Evidence of Chemical Reactions Answers

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How do balanced chemical equations show the conservation of mass?

They show that the atoms in the products may be different than the reactants as long as the mass does not change.

They show that the atoms in the products are the same as in the reactants, but the number of atoms must change.

They show that the number of atoms of each element is the same in the products and reactants.

Which equation obeys the law of conservation of mass?

H2(g) + O2(g) → H2O(g)

H2(g) + O2(g) → H2O(g) +4He(g)

2H2(g) + O2(g) → 2H2O(g)

H2(g) → H2O(g)

H2(g) + O2(g) → 2H2O(g)

In level 3, you balanced the equation NH3 + O2 → NO2 + H2O. What number did you place in front of water?

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