Understanding Elements, Compounds, and Mixtures

What is an element?

• A substance that can be broken down into simpler substances

• A mixture of two or more substances

• A pure substance that cannot be broken down by chemical processes

• A compound formed by chemical reactions

Which of the following is a chemical symbol for carbon?

• Co

• Cr

• C

• Ca

Which property is NOT typical of metals?

• Brittle

• High melting point

• Good electrical conductivity

• Shiny appearance

What is a characteristic of metalloids?

• They are all liquids at room temperature

• They are excellent conductors of electricity

• They have properties of both metals and non-metals

• They are all gases at room temperature

What is the fundamental unit of an element?

• Atom

• Compound

• Mixture

• Molecule

How is a diatomic molecule formed?

• By combining two compounds

• By combining two different elements

• By combining two atoms of the same element

• By combining three or more atoms

What is a compound?

• A mixture of elements

• A single element

• A molecule formed by the same type of atoms

• A molecule formed by different types of atoms

Which of the following is true about compounds?

• They are always gases

• They have different properties from the elements that form them

• They have the same properties as the elements that form them

• They cannot be broken down into simpler substances

What is a homogeneous mixture?

• A mixture that is always solid

• A mixture that cannot be separated

• A mixture with distinct regions

• A mixture with uniform composition throughout

Which method is NOT used to separate mixtures?

• Magnetic separation

• Filtration

• Distillation

• Electrolysis