Question

part 2: using chemical formulas as evidence for each change below: - decide whether it is physical or chemical - explain how the chemical formulas helped you decide 1. h₂o(l) → h₂o(g) type of change: ______

Explanation:

To determine the type of change for the process $\ce{H_{2}O(l) -> H_{2}O(g)}$, we analyze the chemical formulas. The reactant is liquid water ($\ce{H_{2}O(l)}$) and the product is gaseous water ($\ce{H_{2}O(g)}$). A physical change is a change in the state or appearance of a substance without altering its chemical composition. Here, the chemical formula $\ce{H_{2}O}$ remains the same for both the reactant and the product, indicating that the substance (water) has only changed its physical state from liquid to gas. There is no formation of a new substance with a different chemical formula, so this is a physical change.

The chemical formula $\ce{H_{2}O}$ is the same for both the reactant (liquid water) and the product (gaseous water). A physical change involves a change in the physical state (like from liquid to gas) of a substance without changing its chemical composition, so this is a physical change.

Answer:

Type of change: Physical change