Purity

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

  Analytical chemistry
• What does chemical analysis involve?

  It involves instruments and methods to separate, identify, and quantify substances
• What are some methods used in chemical analysis?

  • Paper chromatography for separating pigments
  • Filtration and crystallization to isolate solids
  • Distillation to separate liquids
• What is a pure substance?

  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 saltwater not considered a pure substance?

  Because it is a mixture of two different compounds
• At what temperature does water boil?

  100 degrees Celsius
• Why is the purity of a substance important?

  Only pure substances melt and boil at specific temperatures
• At what temperature does sodium chloride melt?

  801 degrees Celsius
• How can boiling point help identify an unknown liquid?

  If it boils at 100 degrees Celsius, it is likely water
• What type of test is used to determine the boiling point of a substance?

  A physical test
• What happens to the melting and boiling points of impure substances?

  They do not have specific melting and boiling points
• What is a chemical test?

  A test that involves reacting a substance with another chemical
• How do impurities affect the melting point of a sample?

  Impurities lower the melting point
• How do impurities affect the boiling point of a sample?

  Impurities increase the boiling point
• What is the boiling point of saltwater?

  Around 100.5 degrees Celsius
• What is the melting point of saltwater?

  About -2 degrees Celsius
• What are formulations in chemistry?

  Mixtures prepared using a specific formula with precise amounts of components
• What might different components in a formulation contribute?

  Different properties to the final mixture
• How are formulations similar to recipes?

  They contain precise amounts of different components for a specific function
• What is an important feature of formulations?

  The components are always present in the same proportions
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  Give a like and subscribe
• What are some examples of formulations?

  • Fuels
  • Cleaning agents
  • Paints
  • Medicines
  • Alloys
  • Fertilizers
  • Food and drink
• What is the purpose of testing different combinations in formulations?

  To find the right formulation that can be used repeatedly
• What is the field of chemical analysis also known as?

  Analytical chemistry
• What does chemical analysis involve?

  It involves instruments and methods to separate, identify, and quantify substances
• What are some methods used in chemical analysis?

  • Paper chromatography for separating pigments
  • Filtration and crystallization to isolate solids from liquids
  • Distillation to separate different liquids
• What is a pure substance?

  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 can't we call saltwater a pure substance?

  Because it is a mixture of two different compounds
• Why is the purity of a substance important?

  Only pure substances melt and boil at specific temperatures
• At what temperature does sodium chloride melt?

  801 degrees Celsius
• At what temperature does water boil?

  100 degrees Celsius
• If a liquid boils at 100 degrees Celsius, what can we infer about it?

  It is likely to be water
• What type of test is used to identify a substance based on its boiling point?

  A physical test
• What is a chemical test?

  A test that involves 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 and boiling points?

  Impurities lower the melting point and increase the boiling point
• What is the melting point of saltwater?

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

  Around 100.5 degrees Celsius