level: Level 1 of Kap2
Questions and Answers List
level questions: Level 1 of Kap2
| Question | Answer |
|---|---|
| finding a relative molecular mass in gass eq | 1. Conversions 2.work out what you know 3. figure out eq ( pv=nrt) or (n=vx24000 or 24) 4. work out your moles for the eq mr= m/n |
| Stoichiometry | the ratio of the balanced equation |
| reacting masses | 1. work out the moles of the info provided 2. check the stoichiometry ratio to see if it needs x or / 3. then put in m=nxmr or different for gas or conc |
| unknown metal | 1. work out moles 2. check stoich 3. work out moles/ mass = mr 4. periodic table |
| Percentage yield | actual yield/ theoretical yield x 100 1. work out the moles of both depending on the question may have to work backwards |
| Atom Economy | sum of molar mass of desired / sum of molar mass of all products x 100 x + x = h + co2 h/ co2 + h for substainability |
| Strong acid | H+ ions completely dissoaciates |
| Weak acids | Partially dissociates |
| Base | Proton acceptor |
| Acid | Proton donor |
| Ionic equations | Solids- don’t split Liquids - don’t split Gases don’t split Aqueous split |
| Standard solution in buriet | Divide by mean titre |
| Standard solution in conical flask | Divide by 25 cm |
| Mean tire | Put 23.0 |
| ./. Uncertainty | Uncertainty/ volume measured x 100 |