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
• Give an example of a pure substance.

  Pure water or pure sodium chloride
• Why is salt water not considered pure?

  It is a mixture of two compounds
• Why is the purity of a substance important?

  Only pure substances have specific melting and boiling points
• At what temperature does water boil?

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

  801 degrees Celsius
• What can boiling point tests help identify?

  Unknown substances based on boiling point
• 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
• What effect do impurities have on boiling points?

  Increase the boiling 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 in chemistry?

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

  To contain precise amounts of components
• What are some examples of formulations?

  • Fuels
  • Cleaning agents
  • Paints
  • Medicines
  • Alloys
  • Fertilizers
  • Food and drink
• What is an important feature of formulations?

  Components are always present in the same proportions
• How does the formulation of paint work?

  It includes components for color and adhesion
• What happens after testing different combinations in formulations?

  You find a successful formulation to repeat