jessica is testing properties of some substan...
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 jessica’s 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 chemical or physical mixture, mass is conserved. That is, the total mass of the reactants (or components before mixing) equals the total mass of the product (or the mixture after mixing).
## Step2: Identify initial masses
The mass of corn - starch is 455 g and the mass of water is 255 g. The initial total mass is $455 + 255=710$ g.
## Step3: Determine final mass
Since mass is conserved during the mixing process, the mass of the substance formed after mixing is also 710 g.
# Answer:
A. It is 710 g.