Science 10 Chem

• Mole


  Measures any kind of particle including atoms and molecules
• 1 mol


  6.02 × 10^23 particles
• Molar mass


  The mass of one mole of a substance
• Molar mass of elements


  • The mass of one mole is the same as the atomic mass
• Molar mass conversion


  Mass = Moles × Molar Mass
• Converting moles to mass

  Step 1: Calculate molar mass

  Step 2: Calculate mass
• When a chemical change occurs, new chemical products are formed that have different characteristics than the reactants
• Evidence for chemical change

  • Temperature change

  Light

  Sound

  Electricity

  Odour change

  Colour change

  Formation of a gas
• Exothermic reaction


  Reactions that release energy
• Endothermic reaction


  Reactions that absorb energy
• Chemical equation


  Used to communicate a chemical change or reaction
• Conservation of matter: Matter cannot be created nor destroyed
• Coefficient


  Used to balance the number of each type of atom in a chemical equation
• Subscript


  Indicates the number of atoms of an element in a compound
• A balanced chemical equation has the same number of each type of atom on the reactant and product side
• Balancing chemical equations


  Adjust coefficients to balance the number of each type of atom
• Precipitate


  A new solid formed when two solutions are mixed together
• When two solutions are mixed and a gas is produced, you would expect to observe bubbles