Chapter 3 science (chemical composition)

• What are elements?

  -Matter in its simplest form

  -Cannot be broken down into 2 or more simpler substances by chemical/physical methods
• What are compounds?


  Substances formed by the chemical combination of two or more elements.
• What are mixtures?


  Combination of two or more different substances that are not chemically combined.

  It can be made up of

  1. Elements
  2. Compounds
  3. Elements and compounds
• Properties of compounds:

  1. Components are CHEMICALLY combined
  2. Do NOT have similar properties as its components
  3. It has a fixed composition
  4. It CANNOT be separated by PHYSICAL methods
  5. It has a FIXED BOILING POINT and MELTING POINT
• Properties of mixtures

  1. Components are NOT chemically combined
  2. It has similar properties as its components
  3. It does NOT have a fixed composition
  4. It can be separated by physical methods
  5. It does NOT have a FIXED BOILING POINT and MELTING POINT
• What is a solution?

  Solution is a homogeneous mixture where one substance (the solute) dissolves completely in another substance (the solvent).
• What are solutes?

  A substance that dissolves in another substance.
• What are solvents?

  Substances that dissolves other substances.
• What are suspensions?

  They are Heterogeneous mixtures, a mixture of insoluble substances that are suspended in a liquid or gas.
• What is solubility?

  Solubility is the ability of a solute to dissolve in a solvent to form a homogeneous solution.
• What are some factors or solubility?

  1. The nature of the solvent
  2. The nature of the solute
  3. Temperature
• What is the rate of solubility?

  The amount of solute that dissolves in a fixed amount of solvent, given a fixed amount of time.
• What are some factors that affects the rate of solubility?

  1. Temperature of solvent
  2. Rate of stirring
  3. Size of solute particles
• What do they mean when they say a substance is SOLUBLE?

  The substance (solute) is able to dissolve completely in a solvent.
• What do they mean when they say a substance is INSOLUBLE?

  Substances that do not dissolve in a given solvent