jessica is testing properties of some substances. she measures 455 grams (g) of cornstarch and 255 g of…

jessica is testing properties of some substances. she measures 455 grams (g) of cornstarch and 255 g of water for a total mass of 710 g. after mixing the cornstarch and water, she measures the mass of the substance that has formed. which of the following best describes the mass of jessicas substance?\na it is 710 g.\nb it is less than 455 g.\nc it is a little greater than 710 g.\nd it is between 255 g and 455 g.

jessica is testing properties of some substances. she measures 455 grams (g) of cornstarch and 255 g of water for a total mass of 710 g. after mixing the cornstarch and water, she measures the mass of the substance that has formed. which of the following best describes the mass of jessicas substance?\na it is 710 g.\nb it is less than 455 g.\nc it is a little greater than 710 g.\nd it is between 255 g and 455 g.

Answer

Explanation:

Step1: Recall mass - conservation law

In a physical mixture (no chemical reaction occurs when corn - starch and water are mixed), mass is conserved.

Step2: Calculate the total initial mass

The mass of corn - starch is $m_1 = 455$ g and the mass of water is $m_2=255$ g. The total initial mass $m = m_1 + m_2=455 + 255=710$ g.

Step3: Determine the final mass

Since mass is conserved in this physical mixing process, the mass of the substance formed after mixing is equal to the total initial mass.

Answer:

A. It is 710 g.