PAE(03/05/25): Chemical Properties of Materials

Chemical properties differ from physical properties in that they:

• are observed without changing the substance's chemical identity

• involve a change in the substance's chemical identity

• are related to the substance's physical state

• are the same as physical properties

Chemical properties differ from physical properties in that they:

• are observed without changing the substance's chemical identity

• involve a change in the substance's chemical identity

• are related to the substance's physical state

• are the same as physical properties

Flammability is considered a chemical property because:

• it involves a physical change.

• it can be observed without changing the substance.

• it involves a change in the chemical composition of a substance.

• it is a reversible process.

Flammability is considered a chemical property because:

• it involves a change in temperature.

• it involves a change in state.

• it involves a change in composition.

• it involves a change in size.

Explain how a material’s reactivity with acid helps identify it as a chemical property. Some materials react with acids, producing gas, heat, or other chemical changes. Application: Acid reactivity is essential in fields like food science, where acidity levels impact food preservation and taste.

• Reactivity with acid is a physical property.

• Reactivity with acid is a chemical property.

• Reactivity with acid is neither a physical nor a chemical property.

• Reactivity with acid is only relevant in industrial applications.

A material’s reactivity with acid helps identify it as a chemical property because it:

• changes the material's color

• produces a gas

• forms a precipitate

• dissolves completely

Oxidation is a process involving:

• the gain of electrons

• the loss of electrons

• the gain of protons

• the loss of protons

The application of preventing oxidation in industries is:

• To enhance product durability

• To increase oxidation

• To reduce production costs

• To promote rust formation

Describe what happens to iron when it undergoes oxidation.

• Iron turns into gold.

• Iron rusts and forms iron oxide.

• Iron melts.

• Iron becomes magnetic.

Iron undergoes oxidation to form:

• iron oxide

• iron sulfide

• iron chloride

• iron nitrate