A sample of CO2(s) and a sample of CO2(g) differ in their

1) chemical compositions
2) empirical formulas
3) molecular structures
4) physical properties

Question

A sample of CO2(s) and a sample of CO2(g) differ in their

1) chemical compositions 
2) empirical formulas 
3) molecular structures 
4) physical properties

marmal · Answer

The correct answer is D. CO2(s) is a solid. CO2(g) means it is gas. 
 So they differ in their physical properties. Physical propertiers means that they differ in their look.

marmal · Answer

CO2(s) and CO2(g) differ in their physical properties due to being in different states of matter. CO2(s) is a solid known as dry ice, while CO2(g) is a colorless, odorless gas at room temperature. Therefore, the correct answer is 4) physical properties . 
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A sample of CO2(s) and a sample of CO2(g) differ in their 1) chemical compositions 2) empirical formulas 3) molecular structures 4) physical properties

Answer (2)

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A sample of CO2(s) and a sample of CO2(g) differ in their

1) chemical compositions
2) empirical formulas
3) molecular structures
4) physical properties