Amount of substance

• What is relative atomic mass (Ar) defined as?

  Mean mass of an atom divided by carbon-12
• What is relative molecular mass (Mr) defined as?

  Mean mass of a molecule divided by carbon-12
• What is the term used for relative molecular mass in ionic compounds?

  Relative formula mass
• What is the mole a unit of measurement for?

  Substances
• What does the Avogadro Constant represent?

  Number of particles in a mole
• How can the number of particles in a sample be found?

  Using the Avogadro Constant and mass
• What is the formula for calculating concentration?

  Concentration = moles/volume

  
• What trends do gases and volatile liquids follow under standard conditions?

  Pressure, volume, and temperature relationships
• What is the ideal gas equation?

  PV = nRT

  
• What are the standard units for pressure in the ideal gas equation?

  Pascals

  
• What is the value of the ideal gas constant (R)?

  8.31 JK^-1mol^-1
• What is an empirical formula?

  Simplest whole number ratio of atoms
• How is the molecular formula determined?

  Using Mr of empirical formula and true Mr

  
• Why must chemical equations be balanced?

  To ensure correct reacting ratios
• What can balanced chemical equations be used to calculate?

  Reacting masses, percentage yield, atom economy
• What does high atom economy indicate in industrial processes?

  Little or no waste product
• Why is high atom economy beneficial for the environment?

  Uses less natural resources and energy
• What is the key concept for chemical calculations?

  The mole
• How is the mole defined in chemistry?

  Amount of substance in grams equal to 12g of carbon-12
• What is Avogadro's Number?

  6.022 x $10^{23}$ atoms
• What does one mole of any specified entity contain?

  6.022 x $10^{23}$ of that entity
• What are the three equations used to calculate moles at A-level?

  1. For pure solids, liquids, and gases
  2. For gases: $PV =$$nRT$
  3. For solutions: $concentration =$$\frac{moles}{volume}$
• What is the unit of mass in chemical calculations?

  Grams
• What is the unit of moles?

  mol
• What is the unit of pressure (P)?

  Pa
• What is the unit of volume (V)?

  m$^3$
• What is the unit of temperature (T)?

  K
• What is the value of R in the gas equation?

  8.31
• What is the unit of concentration?

  mol dm$^{-3}$ or M
• How do you convert cm$^3$ to dm$^3$?


  Divide by 1000
• How do you convert cm$^3$ to m$^3$?


  Divide by 1,000,000
• How do you convert dm$^3$ to m$^3$?


  Divide by 1000
• How do you convert °C to K?

  Add 273
• What is relative atomic mass?

  Average mass of one atom compared to carbon-12
• What is the main topic of the video series?

  Calculations involving moles and concentration
• What is relative molecular mass?

  Average mass of a molecule compared to carbon-12
• How should the Mr be quoted?

  To 1 decimal place
• What are some specific topics covered in the series?

  Percentage yield, atom economy, gas equation
• How do you calculate the number of moles of CuSO₄ in 35.0g?

  moles = mass / Mr
• What is a mole compared to a dozen?

  A mole describes a specific large number