Elements, Compounds, and Mixtures

What is a heterogeneous mixture?

• A mixture that has a uniform composition, like saltwater.

• A mixture that does not have a uniform composition, such as a salad.

• A mixture that can be easily separated by physical means, like sand and iron filings.

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

What is a physical change?

• A change that alters the chemical composition of a substance.

• A change that affects one or more physical properties of a substance without altering its chemical composition.

• A change that occurs only at high temperatures.

• A change that involves the formation of a new substance.

What is the chemical formula for water?

• H2O

• CO2

• NaCl

• O2

What is the role of chemical bonds in compounds?

• Chemical bonds hold the atoms together in a compound, determining its properties and behavior.

• Chemical bonds are responsible for the color of the compound.

• Chemical bonds only affect the physical state of the compound.

• Chemical bonds have no significant role in the behavior of compounds.

What is a homogeneous mixture?

• A mixture that has a uniform composition throughout, such as saltwater.

• A mixture where the components can be easily distinguished, like salad.

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

• A mixture that has varying composition, like air.

How can mixtures be separated?

• Through chemical reactions

• By using a magnet

• Through physical changes, such as filtration, evaporation, or distillation.

• By heating them to high temperatures

What cannot be broken down into other substances?

• A compound

• A mixture

• An element

• A solution

What is the difference between a compound and a mixture?

• A compound is a mixture of two or more elements that are not chemically bonded.

• A compound is a substance formed from two or more elements that are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.

• A compound is a single element, while a mixture contains multiple elements.

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

What is a mixture?

• A combination of two or more substances that are chemically bonded.

• A combination of two or more substances that are not chemically bonded, where individual substances retain their own properties.

• A single substance that cannot be separated into its components.

• A solution where one substance completely dissolves in another.

What is the chemical formula for table salt?

• NaCl

• KCl

• CaCl2

• MgCl2