Gold is a rare metal that is often blended with other metals to lower the cost of jewelry or art. what physical property of gold could you determine if a piece is pure gold?

Physical property is density.

Explanation:

This check needs precision. Gold is a dense metal, 19.32 grams per cubic centimeter. For that you have to calculate the density, weighing the piece on a scale, then you would fill a test tube with water and introduce the piece and note how much the water has risen. Density is defined as the mass divided by the displaced volume. If the result you get is close to 19 it will be a 24-karat gold piece.

the answer is d.) potassium