Distinguishing Physical and Chemical Changes

The video tutorial by Mr. Millings explains the differences between physical and chemical changes. Physical changes alter the form of a substance without changing its chemical identity, such as grinding peanuts into peanut butter or melting ice. Chemical changes involve a change in the substance's chemical makeup, like fermentation or combustion. The video provides examples of each type of change and emphasizes that all chemical changes are accompanied by physical changes, but not vice versa.

What type of change occurs when peanuts are ground into peanut butter?

• None of the above

• Biological change

• Physical change

• Chemical change

Which process describes the transformation of a copper bar into copper wire?

• Melting

• Ductility

• Evaporation

• Condensation

What happens to the chemical identity of ice when it melts into water?

• It partially changes

• It remains the same

• It changes completely

• It disappears

What is the process called when sugar is turned into alcohol?

• Fermentation

• Sublimation

• Oxidation

• Reduction

What results from the oxidation of an iron nail?

• Water

• Copper oxide

• Alcohol

• Iron oxide or rust

What are the products of electrolyzing water?

• Nitrogen and oxygen gas

• Hydrogen and oxygen gas

• Oxygen and carbon dioxide gas

• Hydrogen and helium gas

What type of change occurs when water vapor condenses into liquid water?

• Both B and C

• Chemical change

• Physical change

• State change

What type of change is involved when gasoline burns?

• Physical change

• Chemical change

• State change

• None of the above

What does the sublimation of dry ice demonstrate?

• Physical change

• Chemical change

• Biological change

• None of the above

What is the outcome when water is evaporated?

• It turns into a solid

• It becomes a plasma

• It remains a liquid

• It turns into a gas