Answer: B. Solution
Explanation: According to the question statement, Susan wrote in her notebook that it was a blue liquid. Therefore, from a chemistry point of view, it was a solution and not a heterogeneous mixture. Then, the solvent was evaporated after leaving the solution for 72 hours at the windowsill. The solute (blue color most likely) however was not able to evaporate with solvent and left behind.
Example: if you leave the KMnO4+water solution for a few days, water will evaporate thus leaving behind purple crystals of KMnO4.
A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable.
<u>Answer:</u> The mass of acetic acid that will be consumed is 1.512 g.
<u>Explanation:</u>
Molarity is defined as the moles of solute present per liter of the solution.
The formula used to calculate the molarity of the solution is:
OR
......(1)
Given values:
Molarity of acetic acid = 0.84 M
Volume of solution = 30 mL
Molar mass of acetic acid = 60 g/mol
Plugging values in equation 1:
Hence, the mass of acetic acid that will be consumed is 1.512 g.