Answered

To determine whether a chemical reaction has taken place, a scientist can observe the properties of substances before and after a change has occurred. Which property is unique for each substance in its purest form?


Asolubility
Bstate
Ccolor
Dtemperature
Edensity

Verified Answer :

Final answer:

Density is a unique property of each pure substance, helping scientists determine whether a chemical reaction has occurred. Other properties like solubility and color can change under different conditions, making density a more reliable identifier. Understanding density is essential in chemistry for identifying materials and reactions.


Explanation:

Identifying Unique Properties of Substances

In chemistry, to determine whether a chemical reaction has occurred, it's essential to observe the physical properties of substances before and after the change. Among the various properties that scientists can examine, density is unique for each substance in its purest form. While other properties such as solubility, state, color, and temperature may change with conditions and mixtures, density remains constant for a pure substance, allowing chemists to accurately identify it.

Understanding Density

Density is defined as the mass of a substance divided by its volume (Density = Mass/Volume). For example, the density of water is about 1 g/cm³, while the density of gold is approximately 19.32 g/cm³. This unique density allows one to distinguish between substances and is critical in identifying materials and understanding the behavior of chemical reactions.


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