Physical and Chemical Properties and Changes

How can you tell if a change is physical or chemical?

• If the substance retains its original properties and composition, it is a physical change; if it forms new substances, it is a chemical change.

• If the change can be reversed easily, it is a chemical change.

• If the substance changes color, it is a physical change.

• If the substance evaporates, it is a chemical change.

What is an intrinsic property?

• A property that depends on the amount of substance, such as mass or volume.

• A property that does not depend on the amount of substance, such as density or boiling point.

• A property that can change with temperature, such as solubility.

• A property that is only observable under specific conditions, such as color.

What are physical changes?

• Changes that alter the chemical composition of a substance.

• Changes that do not alter the chemical composition of a substance, such as melting, freezing, or evaporating.

• Changes that only occur at high temperatures.

• Changes that involve the formation of new substances.

What is a physical property?

• Characteristics of a substance that can be observed with the senses, such as color, odor, and density.

• The ability of a substance to undergo a chemical change.

• The temperature at which a substance changes from solid to liquid.

• The mass of a substance per unit volume.

What is a chemical change?

• A change that results in the formation of new chemical substances, such as rusting or burning.

• A change that only affects the physical properties of a substance.

• A change that occurs when a substance is heated without any chemical reaction.

• A change that can be easily reversed, such as melting ice.

What is density?

• Density is the mass of a substance divided by its volume, often used to determine purity.

• Density is the weight of an object regardless of its size.

• Density is the total volume of a substance divided by its mass.

• Density is a measure of how much space an object occupies.

What is an example of a chemical property?

• Reactivity with acid or flammability.

• Color change when heated.

• Melting point of a substance.

• Density of a liquid.

Give an example of a physical change.

• Melting ice or boiling water.

• Burning wood.

• Rusting iron.

• Digestion of food.

Give an example of a chemical change.

• Burning wood or baking a cake.

• Melting ice into water.

• Dissolving sugar in water.

• Chopping vegetables.

What is the difference between physical and chemical properties?

• Physical properties can be observed without changing the substance, while chemical properties can only be observed during a chemical reaction.

• Physical properties can only be observed during a chemical reaction, while chemical properties can be observed without changing the substance.

• Physical properties are always visible, while chemical properties are invisible.

• Physical properties can change the substance, while chemical properties cannot.