Purity & Formulations

• What is the field of chemical analysis also known as?

  Analytical chemistry
• What does chemical analysis involve?

  Separating, identifying, and quantifying substances
• What are some methods used in chemical analysis?

  • Paper chromatography
  • Filtration
  • Crystallization
  • Distillation
• What is a pure substance?

  Contains only one type of compound or element
• Why is pure water considered a pure substance?

  It contains only water molecules
• Why can't we call salt water a pure substance?

  It is a mixture of two different compounds
• What happens to the melting and boiling points of impure substances?

  They melt and boil over a range of temperatures
• What is the boiling point of pure water?

  100 degrees Celsius
• What is the melting point of sodium chloride?

  801 degrees Celsius
• How does the presence of impurities affect melting points?

  It lowers the melting point
• What is the melting point of salt water?

  About minus 2 degrees Celsius
• What is the boiling point of salt water?

  Around 100.5 degrees Celsius
• What are formulations?

  Mixtures prepared using a specific formula
• What is the purpose of formulations?

  To contain precise amounts of components
• How do the components in a formulation contribute?

  Each component contributes a different property
• What happens once a successful formulation is created?

  It can be used repeatedly with the same formula
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