Question

Nanaki is investigating some of the properties of eggs through a series of experiments. She records her results in a table, but she is not sure which changes are physical and which are chemical.

Answer 1

Step-by-step explanation:

Based on the information provided in the table, experiments 3 and 4 caused chemical changes to the eggs. In experiment 3, boiling the whole eggs for 15 minutes resulted in the eggs solidifying, the clear part turning white, a greenish film forming around the yolk, and the yolk turning pale yellow. These changes indicate a chemical reaction taking place. In experiment 4, pouring the beaten eggs into a heated, oiled pan resulted in the eggs solidifying and developing a brown crust. Again, this indicates a chemical change as the eggs undergo a transformation, forming a new substance.

On the other hand, experiments 1 and 2 did not cause chemical changes. In experiment 1, mixing the eggs with a whisk for one minute only created a mixture of the white and yolk, forming a yellow liquid. This is a physical change as no new substances are formed. In experiment 2, beating the eggs with an electric mixer for five minutes only changes the physical appearance and texture of the eggs, but no chemical changes occur.

Therefore, based on the observations recorded in the table, experiments 3 and 4 caused chemical changes to the eggs, while experiments 1 and 2 did not.