investigations were carried out in a science lab to explore the topic of chemical and physical…

investigations were carried out in a science lab to explore the topic of chemical and physical changes.\ninvestigation a\nstep 1. add 5 tsp. salt to 100 ml warm water and stir until most or all of the salt is no longer visible.\nstep 2. heat the salt solution on a burner until only a white solid remains.\ninvestigation b\nstep 1. mix 10 tsp. white sugar into 100 ml water and stir until most or all of the sugar is no longer visible.\nstep 2. heat the sugar solution on a burner until the solution thickens and turns brown.\nin which step(s) did a chemical change most likely occur?\no investigation a, step 1 and investigation b, step 1\no investigation a, step 2 and investigation b, step 2\no investigation a, step 2 only\no investigation b, step 2 only

investigations were carried out in a science lab to explore the topic of chemical and physical changes.\ninvestigation a\nstep 1. add 5 tsp. salt to 100 ml warm water and stir until most or all of the salt is no longer visible.\nstep 2. heat the salt solution on a burner until only a white solid remains.\ninvestigation b\nstep 1. mix 10 tsp. white sugar into 100 ml water and stir until most or all of the sugar is no longer visible.\nstep 2. heat the sugar solution on a burner until the solution thickens and turns brown.\nin which step(s) did a chemical change most likely occur?\no investigation a, step 1 and investigation b, step 1\no investigation a, step 2 and investigation b, step 2\no investigation a, step 2 only\no investigation b, step 2 only

Answer

Explanation:

Step1: Analyze Investigation A Step 1

Dissolving salt in water is a physical change as no new substance is formed, just a solution.

Step2: Analyze Investigation A Step 2

Evaporating water from salt - water solution to get salt is a physical change as it is a separation process and no new substance is formed.

Step3: Analyze Investigation B Step 1

Dissolving sugar in water is a physical change as it is just forming a solution and no new substance is created.

Step4: Analyze Investigation B Step 2

Heating sugar solution until it thickens and turns brown is a chemical change. Sugar undergoes a chemical reaction (caramelization) to form new substances with different chemical properties.

Answer:

Investigation B, Step 2 only