Question

use the information below to answer questions 7 - 8.

1. the diagram above represents solid carbon dioxide, better known as dry ice. which diagram below best represents some of the dry ice after it sublimes into a gas?
2. justify your selection in #7.

(a) sublimation is a chemical change, so the co₂ molecules should rearrange into individual atoms.
(b) sublimation is a physical change, so the co₂ molecules should remain in the same composition.
(c) sublimation is a chemical change, so the co₂ molecules should rearrange into different molecules.
(d) sublimation is a physical change, so the co₂ molecules should rearrange into compounds with different properties.

Explanation:

Sublimation is a physical change. In a physical change, the chemical composition of the substance remains the same. For carbon dioxide (\(CO_2\)), during sublimation from solid (dry ice) to gas, the \(CO_2\) molecules do not break down into individual atoms or form new molecules or compounds with different properties. They just change their state from solid - state arrangement (closely packed in the solid diagram) to a more dispersed arrangement in the gas state while still remaining as \(CO_2\) molecules.

Answer:

1. A (assuming diagram A shows \(CO_2\) molecules in a more dispersed state while still as \(CO_2\) molecules).
2. B