Purity and 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 pure substances?

  They melt and boil at specific temperatures
• At what temperature does water boil?

  100 degrees Celsius
• At what temperature does sodium chloride melt?

  801 degrees Celsius
• What is a physical test in chemistry?

  Testing physical properties of a substance
• What is a chemical test in chemistry?

  Reacting a substance with another chemical
• How do impure substances behave in terms of melting and boiling points?

  They melt and boil over a range of temperatures
• What effect do impurities have on melting points?

  Lower the melting point of the substance
• What effect do impurities have on boiling points?

  Increase the boiling point of the substance
• What is the melting point of salt water?

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

  Around 100.5 degrees Celsius
• What are formulations in chemistry?

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

  To contain precise amounts of components
• What is an important feature of formulations?

  Components are always present in the same proportions
• How does the formulation process relate to recipes?

  It is like a recipe for a specific mixture
• What might different components in a formulation contribute?

  Different properties to the final mixture
• What happens after trying different combinations in formulations?

  Find the right combination to repeat
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• What will happen in the next videos?

  Look at examples of chemical analysis