| What is meant by term stoichiometry? | Stoichiometry is the proportions of reactants and products.
A balanced chemical equation can be used to find the stoichiometry of a reaction. |
| What is meant by term stoichiometry? | Stoichiometry is the proportions of reactants and products.
A balanced chemical equation can be used to find the stoichiometry of a reaction. |
| What is meant by term stoichiometry? | Stoichiometry is the proportions of reactants and products.
A balanced chemical equation can be used to find the stoichiometry of a reaction. |
| What is meant by term stoichiometry? | Stoichiometry is the proportions of reactants and products.
A balanced chemical equation can be used to find the stoichiometry of a reaction. |
| What is meant by term relative atomic mass? | The weighted mean mass of an atom of an element relative to an atom of carbon-12 having a mass of exactly 12 units |
| What is meant by term molecular mass? | The weighted average of the mass of a molecule relative to an atom of carbon-12 having a mass of exactly 12 units |
| What is meant by the term relative isotopic mass? | The mass of an atom of an isotope on a scale relative to an atom of carbon-12 having a mass of exactly 12 units |
| What is meant by the term relative formula mass? | The weighted average of the masses of the formula units relative to an atom of carbon-12 having mass of exactly 12 units |
| What is meant by term amount of substance ? | - measured in moles
- Based upon the standard count of atoms called Avogadro Constant.
- Measured the number of atoms in a substance. |
| What is the Avogadro constant (NA)? | - The number of atoms per mole of substance
- Na= 6.02 x 10^23 mol^-1 |
| Define the mole | The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12. |
| How can a mass spectrum be used to deduce the relative molecular mass? | The peak with the highest m/z value (The molecular ion peak or M^+ Peak) is caused by the whole molecule after one electron has been knocked off.
m/z value of M^+ peak = molecular mass |
| What is meant by the term empirical formula? | The simplest whole number ratio of atoms of each element present in a compound. |
| What is meant by the term molecular formula? | The actual number of atoms of each element present in a compound. |
| What is meant by the term concentration? What equation links concentration and number of moles? | Concentration is the amount of solute (usually in moles) dissolved per dm^3 of solution. C=n/v |
| How do you calculate the amount of a given substance (in moles) using mass and molecular mass? | Number of moles = mass / molecular mass
n=m/Mr |
| What equation links volume and number of gaseous moles at room temperature and pressure? | Number of moles = Volume (dm^3) / 24
n=V/24 |
| How many significant figures should calculated results be given to? | Unless stated differently, 3 significant figures. |
| What is meant by term stoichiometry? | Stoichiometry is the proportions of reactants and products.
A balanced chemical equation can be used to find the stoichiometry of a reaction. |
