Purity and Formulations

• What is a pure substance in chemistry?

  A substance not mixed with any other substance
• How can we determine if a substance is pure?

  By measuring its melting and boiling points
• What happens to the temperature of a pure substance during melting?

  The temperature remains fixed at a specific point
• What is the boiling point of pure water?

  100 degrees Celsius
• What does a range of melting and boiling points indicate?

  The substance is not pure
• What does the graph of a pure substance look like during melting and boiling?

  It shows fixed melting and boiling points
• What is a formulation in chemistry?

  A complex mixture designed as a useful product
• Why are the quantities of components in a formulation carefully measured?

  To ensure the product has desired properties
• What does the melting point of pure water indicate?

  It confirms the water is pure
• How does the graph of an impure substance differ from that of a pure substance?

  It shows melting and boiling over a range