Question

q1 chemistry: u1l7 unit 1 review date: prepwork: u1 review 1. **carbon dioxide has a formula of co₂. use this knowledge to represent phase changes from solid to liquid to gas of a sample of carbon dioxide. label each phase and create a key showing an atom of co₂. key = co₂

Explanation:

Step1: Represent Solid Phase

In the solid phase (e.g., dry ice), the $CO_2$ molecules are closely packed in a regular pattern. Draw a section on the left side of the square with $CO_2$ symbols (from the key) arranged in a tight, ordered grid. Label this area "Solid $CO_2$ (Dry Ice)".

Step2: Represent Liquid Phase

For the liquid phase, the $CO_2$ molecules are closer together but can move past each other (less ordered than solid). Draw a middle section with $CO_2$ symbols spaced a bit more than in the solid, with some movement - like arrangement. Label this area "Liquid $CO_2$".

Step3: Represent Gas Phase

In the gas phase, the $CO_2$ molecules are far apart and move freely. Draw a right - hand section with $CO_2$ symbols spread out widely, with large spaces between them. Label this area "Gaseous $CO_2$".

Step4: Ensure Key is Clear

The key is already partially filled with "$ = CO_2$". Make sure it is clear that this symbol represents a carbon dioxide molecule. You can also add a note if needed, like "Each symbol represents one $CO_2$ molecule (composed of 1 C and 2 O atoms)".

Answer:

• Solid Phase (Left Section): Draw $CO_2$ symbols (from key) in a tight, ordered grid. Label "Solid $CO_2$ (Dry Ice)".
• Liquid Phase (Middle Section): Draw $CO_2$ symbols with moderate spacing (less ordered than solid). Label "Liquid $CO_2$".
• Gas Phase (Right Section): Draw $CO_2$ symbols spread widely. Label "Gaseous $CO_2$".
• Key: Ensure "$ = CO_2$" is clear, representing a $CO_2$ molecule.