Question

1 multiple choice 1 point why is water turning to a gas a physical change? it forms a new substance it is no longer h₂o it is still h₂o it becomes a new substance 2 multiple choice 1 point what is in the bubbles when water boils? both hydrogen gas and oxygen gas h₂o gas h₂ o₂

Explanation:

1. A physical change does not create a new substance. Water turning to gas (water - vapor) is still composed of $H_2O$ molecules. Chemical changes form new substances with different chemical formulas.
2. When water boils, the bubbles contain water in the gaseous state, which is $H_2O$ gas. It is a physical change from liquid water to gaseous water, not a decomposition into hydrogen and oxygen gases (which would be a chemical change).

Answer:

1. It is still $H_2O$
2. $H_2O$ gas