Which of these describes a chemical property? A. the color of the substance B. the hardness of the substance C. how the substance behaves in the presence of an acid D. how the substance behaves in the presence of a magnet

Chemical properties can be defined as the ones that describe a substance's ability to undergo chemical changes.

Physical properties can be defined as the ones that are measured and observed without actually changing the substance's identity.

Among the given options, the color, the hardness, and the behavior of a substance in the presence of a magnet are all examples of physical properties.

However, the behavior of a substance in the presence of an acid is an example of chemical property.

Hence, the correct answer is option c.

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C. How the substance behaves in the presence of an acid.

Explanation:

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1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

the dissolution of polymer can be thermodynamically described in 2 steps.