Physical Versus Chemical Properties and Changes Explained

The video tutorial explains the differences between physical and chemical properties and changes. Physical properties can be observed without altering the substance, while chemical properties require a change in the substance. Physical changes involve changes in form or state without altering the composition, whereas chemical changes result in new substances with different properties. Indicators of chemical changes include energy changes, light production, and color changes.

What is a characteristic of extensive properties?

• They are independent of the amount of substance.

• They change the substance's composition.

• They depend on the amount of substance.

• They describe chemical reactions.

Which of the following is an example of an intensive property?

• Length

• Color

• Volume

• Mass

What happens during a physical change?

• The substance remains the same but in a different state.

• Energy is always absorbed.

• A new substance is formed.

• The substance's composition changes.

Which of the following is NOT a physical change?

• Melting

• Burning

• Freezing

• Boiling

How can chemical properties be observed?

• By observing the substance's color.

• By measuring the substance's mass.

• By changing the substance into something else.

• By measuring the substance's volume.

What is required to determine if a substance is flammable?

• Measuring its density

• Burning it

• Observing its color

• Measuring its volume

What is a chemical change?

• A change that does not involve energy.

• A change that only affects the physical state.

• A change that results in a new substance with new properties.

• A change that is always reversible.

Which of the following is a sign of a chemical change?

• The substance changes color.

• The substance melts.

• The substance is dissolved in water.

• The substance is cut into pieces.

What does the production of light during a reaction indicate?

• A physical change

• A chemical change

• No change

• A reversible change

If a gas is produced during a reaction, what type of change is likely occurring?

• Reversible change

• No change

• Chemical change

• Physical change