Maria would like to determine how mixing two solutions that chemically react with each other affects the density of the solutions. Maria hypothesizes that the solutions will increase in density. Maria tests her hypothesis by: 1. Selecting the solutions to test. 2. Pouring the solutions together. 3. Measuring the density of the solutions after the chemical reaction has taken place. 4. Recording her results. What is wrong with how Maria tested her hypothesis?

Maria has not taken the reading for densities of the two solutions individually

Explanation:

Maria has not taken the reading for densities of the two solutions individually. Since Maria is aiming to compare the result of density of each individual solution with the density of the combined solution, she must have the reading for individual solution densities.

However, all other test proceedings are correct.

Here, the densities of individual solution shall act as control group which shall be compared with the experimental group i. e the density of combined solution.

A.

Explanation: Maria did not measure the solutions' densities before mixing the solutions.