quantitative

• QUANTITATIVE CHEMISTRY P1 - what is the conservation of mass?

  in a chemical reaction, atoms are not created or destroyed, just arranged. total mass before = total mass after the reaction.
• QUANTITATIVE CHEMISTRY P1 - when a metal forms a metal oxide, why does the mass increase?

  atoms from gaseous oxygen have been added.
• QUANTITATIVE CHEMISTRY P1 - when an acid reacts with a metal, why does the mass decrease?

  a gas is produced and escapes.
• QUANTITATIVE CHEMISTRY P1 - what is relative formula mass?

  the sum of the relative atomic masses of each atom in a substance.
• QUANTITATIVE CHEMISTRY P1 - what are the four state symbols and what do they stand for?

  (S) solid, (l) liquid, (g) gas, (aq) aqueous or dissolved in water.
• QUANTITATIVE CHEMISTRY P1 - what is a mole?

  mass of a substance that contains 6.02 x 10 ^ 23 particles.
• QUANTITATIVE CHEMISTRY P1 - give the value for the Avogadro constant.

  6.02 x 10 ^ 23.
• QUANTITATIVE CHEMISTRY P1 - which formula is used to calculate the number of moles from mass and Mr?

  moles = mass/Mr.
• QUANTITATIVE CHEMISTRY P1 - what is the unit for concentration?

  g/dm^3.
• QUANTITATIVE CHEMISTRY P1 - which formula is used to calculate concentration from mass and volume?

  concentration = mass/volume
• QUANTITATIVE CHEMISTRY P1 - how can you convert a volume reading in cm^3 to dm^3?

  divide by 100.
• QUANTITATIVE CHEMISTRY P1 - if the amount of solute in a solution is increased, what happens to its concentration?

  increases.
• QUANTITATIVE CHEMISTRY P1 - if the amount of water in a solution is increased, what happens to its concentration?

  decreases.
• QUANTITATIVE CHEMISTRY P1 - what is the limiting reactant?

  in a chemical reaction between two or more reactants, often one of the reactant will run out before the others. you then have some of the other reactants left over. the reactant that is left over is in excess. the reactant that runs out is the limiting reactant.