Chemical Change

Mr. Anderson explains the differences between chemical and physical changes, using examples like rotting fruit and rusting iron. He discusses how chemical changes involve forming new substances, while physical changes involve changes in state. Evidence of chemical changes includes changes in odor, color, gas production, heat, and precipitate formation. The video also covers laboratory examples of chemical changes, such as acid-base reactions and redox titrations.

What is an example of a physical change that occurs during sleep?

• Breathing out carbon dioxide

• Conversion of food into energy

• Evaporation of water from the skin

• Cellular respiration

What happens at the particulate level during a chemical change?

• Atoms rearrange to form new substances

• Substances change state but remain the same

• Molecules move faster

• Atoms become larger

Which of the following is NOT evidence of a chemical change?

• Formation of a solid

• Change in color

• Production of a gas

• Change in state

What type of change is rusting iron considered to be?

• State change

• Reversible change

• Chemical change

• Physical change

Which of the following is a physical change?

• Rotting fruit

• Rusting metal

• Boiling water

• Burning paper

What indicates a chemical change when using red cabbage juice in a lab?

• Change in color

• Change in volume

• Change in state

• Change in temperature

What is the result of dissolving sugar in water?

• Chemical change

• Physical change

• Formation of a new substance

• Production of gas