Louis and Keisha each dropped stones from different heights onto pieces of clay to see how much the clay would be compacted. Louis dropped his stone onto a small piece of clay and noticed that the clay was smashed a lot. Keisha dropped her stone onto a large piece of clay and noticed that the clay was compacted very little. Should Louis and Keisha conclude that Louis’s stone had more kinetic energy when it hit the clay? Explain why.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e