Understanding Pure Substances and Mixtures

What defines a pure substance?

• A substance that changes state easily

• A substance with only one type of atom or molecule

• A substance with multiple types of atoms

• A mixture of different substances

Why is water considered a pure substance in the context of this video?

• Because it can dissolve many substances

• Because all water molecules are identical

• Because it contains only hydrogen atoms

• Because it is always found in nature

What makes container D a mixture?

• It contains only water molecules

• It contains only oxygen gas

• It contains different types of pure substances

• It contains only chlorine atoms

Which of the following is an example of a mixture?

• Distilled water

• Chlorine gas

• Salt water

• Oxygen gas

Why is distilled water considered almost a pure substance?

• It contains a variety of chemicals

• It is mostly composed of H2O

• It has a high salt content

• It is found in tap water