Which beaker has the least thermal energy? please don't guess, i already got 1 question wrong, i dont want a 60 on this.

It's B. beaker A

Explanation:

The thermal energy is directly proportional to to the mass of the solution times the temperature difference

In other words more mass and temperature means more thermal energy

So less mass (or mL of solution in our case) and less temperature means less energy

This means we choose the beaker A

Hope this helps have a good day

the answer is b. dilution

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.