Identifying Chemical vs Physical Changes

The video tutorial explains the difference between physical and chemical changes. It uses examples like melting ice and browning butter to illustrate these concepts. Physical changes do not alter the chemical composition, while chemical changes do. The video also discusses the Maillard reaction and decomposition as examples of chemical reactions. It emphasizes the importance of understanding chemical properties for safety and classification. A pop quiz at the end helps reinforce the learning.

What happens to the chemical composition of water when it changes from ice to liquid?

• It turns into hydrogen and oxygen.

• It becomes H2O2.

• It remains H2O.

• It changes to a different chemical.

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What is a physical change?

• A change that alters the chemical composition.

• A change that can be reversed by another chemical reaction.

• A change that does not alter the chemical composition.

• A change that produces a new substance.

Who developed the philosophy of atomism?

• Democritus

• Plato

• Socrates

• Aristotle

Which of the following is NOT a physical change?

• Boiling water

• Burning wood

• Melting ice

• Cutting a bar of metal

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What is the Maillard reaction?

• A physical change in butter

• A chemical reaction involving amino acids and sugars

• A method of boiling water

• A process of melting ice

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What happens when you caramelize sugar?

• It remains as sucrose.

• It turns into water and carbon dioxide.

• It becomes a physical change.

• It decomposes into fructose and glucose.

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Which of the following is a chemical property?

• Flammability

• Density

• Boiling point

• Malleability

What indicates a chemical reaction has taken place?

• Mixing of substances

• Release of energy in the form of heat or light

• Change in state

• Change in shape

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What is the only way to reverse a chemical change?

• By freezing the substance

• By doing another chemical reaction

• By applying heat

• By melting the substance

What happens when you dissolve salt in water?

• It becomes a physical change.

• It turns into sugar.

• It separates into Na+ and Cl- ions.

• It remains as NaCl.

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