4. a student is doing a lab to determine whether a particular white solid undergoes an endothermic or…
4. a student is doing a lab to determine whether a particular white solid undergoes an endothermic or exothermic dissolving process. suggest a procedure the student could use to complete the lab.
Answer
Explanation:
Step1: Prepare materials
Gather the white - solid, a beaker, a thermometer, and a known volume of solvent (e.g., water).
Step2: Measure initial temperature
Record the initial temperature of the solvent using the thermometer, $T_1$.
Step3: Add solid and mix
Add the white - solid to the solvent in the beaker and stir gently to ensure complete dissolution.
Step4: Measure final temperature
After the solid has completely dissolved, record the temperature of the solution, $T_2$.
Step5: Analyze results
If $T_2>T_1$, the process is exothermic as heat is released. If $T_2 < T_1$, the process is endothermic as heat is absorbed.
Answer:
Follow the steps above: measure the initial temperature of the solvent, add the solid and dissolve it while stirring, then measure the final temperature of the solution. Compare the initial and final temperatures to determine if the process is endothermic or exothermic.