Question

devin is preparing a glass of salt water for a mouthwash. as the salt dissolves, he notices that the glass feels slightly cooler. devin wonders what factors affect a liquids temperature when something dissolves in it. so he decides to design an experiment. he has the following supplies available: tap water, vinegar, two thermometers, two cups, salt, sugar. using only these supplies, which two questions can devin investigate with an experiment? does dissolving salt in water lower its temperature more than dissolving baking soda in it? does dissolving salt in water lower the waters temperature more than dissolving sugar in water does? does dissolving sugar in oil cause a greater temperature drop than dissolving sugar in water? does dissolving a larger amount of salt in water lower the waters temperature more than a smaller amount of salt?

Explanation:

Step1: Check available supplies

Devin has tap - water, vinegar, two thermometers, two cups, salt, sugar.

Step2: Analyze each question

• Question 1: Baking soda is not among supplies, so this cannot be investigated.
• Question 2: Salt and sugar are available, water is available, thermometers can measure temperature change. So this can be investigated.
• Question 3: Oil is not among supplies, so this cannot be investigated.
• Question 4: Salt and water are available, and different amounts of salt can be used, thermometers can measure temperature change. So this can be investigated.

Answer:

Does dissolving salt in water lower the water's temperature more than dissolving sugar in water does?
Does dissolving a larger amount of salt in water lower the water's temperature more than a smaller amount of salt?