Properties and Composition of Matter

What is a physical change?

• A change that results in the formation of a new substance.

• A change in appearance that does not create a new substance.

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

• A change that occurs only in solid materials.

What is solubility?

• The ability of a substance to dissolve in a solvent.

• The measure of how much solute can be added to a solution before saturation occurs.

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

• The process of separating a mixture into its individual components.

What is an example of a physical change?

• Melting ice is an example of a physical change.

• Burning wood is an example of a physical change.

• Rusting iron is an example of a physical change.

• Mixing sand and salt is an example of a physical change.

What distinguishes metals from nonmetals?

• Metals are typically dull, brittle, and poor conductors of heat and electricity.

• Metals are typically shiny, malleable, and good conductors of heat and electricity.

• Metals are typically soft, non-malleable, and insulators of heat and electricity.

• Metals are typically transparent, lightweight, and have low density.

When can chemical properties be observed?

• Chemical properties can only be observed during a chemical change.

• Chemical properties can be observed at any time.

• Chemical properties are observed during physical changes.

• Chemical properties can be observed only in solid substances.

What is a heterogeneous mixture?

• A mixture that is evenly mixed, like saltwater.

• A mixture that is not mixed evenly, such as a salad.

• A mixture that contains only one type of substance, like pure water.

• A mixture that can be separated by physical means, like air.

What is the difference between a compound and a mixture?

• A compound is a substance formed when two or more elements chemically bond, while a mixture is a combination of substances that retain their individual properties.

• A compound is a mixture of different substances, while a mixture is a single substance.

• A compound can be separated by physical means, while a mixture cannot.

• A compound consists of two or more elements that are physically combined, while a mixture consists of elements that are chemically bonded.

What are metalloids?

• Metalloids are elements that are always gases at room temperature.

• Metalloids have properties of both metals and nonmetals.

• Metalloids are elements that are highly reactive and form compounds easily.

• Metalloids are elements that conduct electricity better than nonmetals but worse than metals.

What is an example of a chemical change?

• Melting of ice

• Rusting of iron

• Boiling of water

• Breaking of glass

What is a homogeneous mixture?

• A mixture that is not evenly mixed, such as oil and water.

• A mixture that has a uniform composition throughout, like sugar water.

• A mixture that contains large particles that settle over time, like sand in water.

• A mixture that can be easily separated by physical means, like a salad.