Classification of Matter/Separation Techniques

What is a pure substance?

• A substance made of only one type of atom or molecule.

• A substance made of multiple types of atoms chemically combined.

• A material made of two or more substances mixed but not chemically combined.

• A material that cannot be broken down into simpler substances.

Which of the following is an example of a mixture?

• Gold

• Water

• Sand and salt

• Carbon dioxide

What is a characteristic of mixtures?

• They have a fixed boiling point.

• They have variable compositions.

• They are made of one type of molecule.

• They cannot be separated.

Which of the following is a type of pure substance?

• A) Element

• B) Homogeneous Mixture

• C) Heterogeneous Mixture

• D) Solution

What is a pure substance that consists of only one type of atom?

• Compound

• Mixture

• Element

• Solution

What is formed when two or more atoms combine chemically?

• Element

• Mixture

• Molecule

• Solution

Which of the following is NOT a pure substance?

• Element

• Compound

• Mixture

• Molecule

Which type of mixture has a uniform appearance?

• Heterogeneous

• Homogeneous

• Colloidal

• Suspended

Decantation is used to separate mixtures with what characteristic?

• Same density

• Different density

• Same color

• Same temperature

Which of the following is NOT a component involved in decantation?

• Liquid

• Undissolved solid

• Gas

• Two different liquids