Purity and formulations

• What should you be able to describe by the end of the video?

  Using melting and boiling point data
• What is a pure substance in chemistry?

  A substance not mixed with others
• How can you determine if a substance is pure?

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

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

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

  The substance is not pure
• What does a 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 can you find in the revision workbook mentioned in the video?

  Questions on pure and impure substances
• How does the graph of a mixture differ from that of a pure substance?

  A mixture shows a range of temperatures
• What is the melting point of pure water?

  0 degrees Celsius