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.

In which step(s) did a chemical change most likely

Answer 1

The browning of sugar (Step 2) is a chemical change. The process of browning sugar is known as caramelization.

What is caramelization?

It is the process of browning carb products by dehydrating, heating on the fire. In this process, carbohydrates are broken down.

During caramelization, several products are formed such as caramelan   and caramelin.

During the browning of sugar, the sugar reacts with oxygen to form new products.

Therefore, In the Step 2 the browning of sugar is a chemical change.

Learn more about chemical change here ;

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