Greg classified some substances as shown in the table. Greg's Table Soluble in Water Insoluble in Water Dishwashing detergent Cloth Drink mix Plastic Sand Copper Why is Greg's table incorrect? Plastic is soluble in water. Copper is soluble in water. Sand is insoluble in water. Drink mix is insoluble in water.

Greg's table is incorrect because sand is insoluble in water.

Answer: Option (c) is the correct answer.

Explanation:

If a substance completely dissolves in water and results in the formation of a clear solution then it means the substance is soluble in water.

For example, dish washing detergent, and drink mix are both soluble in water.

Whereas if a substance at all does not dissolve in water then we are able to see particles of the substance into the water. This substance is known as water insoluble substance.

For example, cloth, plastic, sand, and copper are all insoluble in water.

Thus, we can conclude that Greg's table is incorrect because sand is insoluble in water.