Question

Investigations were carried out in a science lab to explore the topic of chemical and physical changes.

Investigation A
Step 1. Add 5 tsp. salt to 100 ml warm water and stir until most or all of the salt is no longer visible.
Step 2. Heat the salt solution on a burner until only a white solid remains.

Investigation B
Step 1. Mix 10 tsp. white sugar into 100 ml water and stir until most or all of the sugar is no longer visible.
Step 2. Heat the sugar solution on a burner until the solution thickens and turns brown.

Answer 1

To help Jaywon and all others out there, the answer is D

Step-by-step explanation:

Jaywon and I both took the test and that is the answer.

Answer 2

A. is a physical change, mixing the salt water and then removing the water from the salt by evaporation.
B. is a chemical change, the sugar by heating and mixing with water is becoming something else.