Exploring Pure Substances and Mixtures

What is matter?

• Only things that can be touched

• Only things that can be seen

• Anything that has mass and occupies space

• Only things that can be tasted

Into which two main categories can matter be classified?

• Pure Substances and Mixtures

• Atoms and Molecules

• Solids and Liquids

• Elements and Compounds

What is an element?

• A compound of different elements

• A mixture of different molecules

• A substance made of the same type of atoms

• A substance made of different types of atoms

What is a compound?

• A single molecule

• Two or more atoms bonded together

• A mixture of elements

• A single type of atom

Which of the following is an example of a compound?

• Oxygen (O2)

• Water (H2O)

• Gold (Au)

• Iron (Fe)

What is a mixture?

• A pure substance

• A single type of atom

• A blend of two or more substances

• A single type of molecule

Which of the following is true about mixtures?

• They are made of one type of atom

• They cannot be separated

• They are a blend of different substances

• They have unique properties

What is an example of a mixture?

• Pure gold

• Salt water

• Oxygen gas

• Distilled water

How can salt be separated from salt water?

• By freezing the water

• By adding more salt

• By boiling the water

• By filtering the water

Which statement is true about pure substances?

• They have no unique properties

• They are always mixtures

• They are made of one type of atom or molecule

• They can be separated into different substances