Problem: The following diagram represents solid carbon dioxide, also known as dry ice. Which of the following diagrams best represents the dry ice after it has sublimed into a gas? 

FREE Expert Solution

We’re being asked which of the following diagrams best represents the dry ice after it has sublimed into a gas.


Recall that sublimation is a phase change from solid to gas:


Let’s first define a physical change and a chemical change.


Physical change → there is a change in a matter as it goes from one physical state to another.


Chemical change → atoms rearrange themselves to create a new substance


This means that the chemical composition of dry ice, CO2 will not change when it sublimes only its physical state:


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Problem Details

The following diagram represents solid carbon dioxide, also known as dry ice. 

The figure shows space-filling molecules arranged in a specific order. Each molecule consists of a black sphere connected to two red spheres arranged opposite to each other.

Which of the following diagrams best represents the dry ice after it has sublimed into a gas? 

There are three pictures. The first picture labeled (a) contains three black spheres and three molecules consisting of two red spheres. The second picture labeled (b) contains three molecules consisting of a black and a red spheres and three molecules consisting of two red spheres. The third picture labeled (c) contains four molecules consisting of a black sphere connected to two red spheres arranged opposite to each other.

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