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• What does each symbol in the periodic table represent?

  A different element
• What is the symbol for magnesium?

  Capital M followed by lowercase g
• What is the symbol for sulfur?

  Capital S
• What defines an element?

  All atoms in an element are the same
• What happens when atoms of magnesium and sulfur are combined?

  They form a compound called magnesium sulfide
• What is a compound?

  Two or more different elements chemically combined
• What does "fixed proportions" mean in a compound?

  Elements are combined in specific ratios
• How do the properties of compounds compare to their constituent elements?

  Compounds usually have different properties
• What is the appearance of magnesium and sulfur compared to magnesium sulfide?

  Magnesium is shiny, sulfur is yellow, sulfide is white
• How can a compound be separated back into its elements?

  By using a chemical reaction
• What characterizes a mixture?

  Different elements or compounds not chemically combined
• What techniques can be used to separate a mixture?

  Filtration, distillation, crystallization, chromatography
• What is a molecule?

  Any elements chemically combined, same or different
• How do compounds differ from molecules?

  Compounds have different elements combined
• What elements are found in methane?

  Carbon and hydrogen
• What elements are found in water?

  Hydrogen and oxygen
• What elements are found in ammonia?

  Nitrogen and hydrogen
• Are chlorine and oxygen molecules compounds?

  No, they are not compounds
• What is the difference between a molecule and a compound?

  A molecule can be the same element combined
• What are the definitions of element, compound, mixture, and molecule?

  • Element: All atoms are the same
  • Compound: Different elements chemically combined
  • Mixture: Different elements or compounds not chemically combined
  • Molecule: Any elements chemically combined
• What are the properties of compounds compared to their constituent elements?

  • Compounds usually have different properties
  • Example: Magnesium (shiny) vs. Magnesium sulfide (white crystals)
• What are the physical separation techniques for mixtures?

  1. Filtration
  2. Distillation
  3. Crystallization
  4. Chromatography
• What are physical separation techniques used for?

  To separate mixtures
• Can physical separation techniques separate elements in a compound?

  No, they cannot separate elements in a compound
• What is filtration used for?

  To separate an insoluble solid from a liquid
• What does the term 'insoluble' mean?

  It will not dissolve in the liquid
• What is the state symbol for a solid?

  S
• What is the state symbol for a liquid?

  L
• What does the state symbol AQ represent?

  It means the substance is dissolved in water
• How can you separate silver chloride from water?

  By using filtration
• What happens to the solid material during filtration?

  It is trapped by the filter paper
• What is the purpose of a filter funnel and filter paper in filtration?

  To separate solid from liquid
• What is crystallization used for?

  To separate a soluble solid from a liquid
• What happens when sodium chloride is mixed with water?

  It dissolves to form a solution
• What does the state symbol AQ indicate about sodium chloride in solution?

  It is dissolved in water
• How can you obtain solid sodium chloride from its solution?

  By allowing water to evaporate
• What happens to sodium chloride when water evaporates?

  It forms solid crystals
• How can heating affect the crystallization process?

  It can speed up evaporation of water
• Why might it be better to allow water to evaporate naturally?

  Certain chemicals may break down when heated
• What are the main physical separation techniques discussed?

  • Filtration
  • Crystallization