h2 chem topical reminders

🧪 H2 chem last-minute reminders Disclaimer: These are general guidelines I got from my notes, teachers and friends. Reminders and styles of writing may differ from school to school, so please follow your own teachers’/school’s guidelines/facts in internal exams. For the actual As…it’s kinda up to you lol 🤩🫵 GENERAL REMINDERS - ‼ ‼ FOR SYNTHESIS QNS, NEVER USE FREE RADICAL SUB AS THE MAIN OPTION. ITS NOT GOOD - For steric hindrance etc, always say the bulky groups around a SMALL atom (small carbon, small whatever. Unless central atom is not small.) - ‼ ‼ ‼ FOR ALL STRUCTURAL ELUCIDATION. pls write every reaction (by its reaction name, see below.) even write the basic things like c:h ratio cause you WONT GET THE 1m unless u write it. - Eg: W + Na → explosive gas. So write: - Redox reaction occurred. Explosive gas is H2 (g) - W has -OH group. - 1 mole of W reacts with 1 mole of H2 (g) → W has 2 -OH groups - Anything about like why xxx and yyy react at same rate …what conclusion about the mechanism - answer wrt rate determining step - Eg this means that the bond breaking (or wtv, eg xxx has greater bond strength) is NOT PART OF RATE DETERMINING STEP - Why is KMnO4 the favoured oxidising agent in titration compared to K2Cr2O7? - KMnO4 colour change: dark purple to colour less /pale pink - Cr2O7: orange to green — ‼ ‼ end point colour change not distinct because both cr2o7 and cr3+ are coloured and end point cannot be detected sharply without use of a suitable indicator - **depends on what species you are oxidising though but if it’s like Fe2+ to Fe3+ which is yellow then the end result is yellow + whatever indicator colour was there - RMB TO WRITE COUNTER IONS!!! - State and explain type of reaction — unless it’s very obviously another type of reaction, it could also be redox so if it’s not clear just try calculating redox numbers - ‼ DONT FORGET YOUR CYCLIC ISOMERS!!!!!!! Salts/general ● BaO dissolves in water to form BaOH2 which is actually soluble in water…

Mole ● If they give some super weird reactants that don’t immediately balance nicely in an equation, try using redox equations to balance it. Or just try rlly hard to balance the normal eqn… Chem bonding ● Cations metal don’t act as charge carriers as they are not mobile ● Vsepr to MINIMISE REPULSION BETWEEN ELECTRON PAIRS ○ ALWAYS MENTION HOW MANY BOND PAIRS HOW MANY LONE PAIRS WHEN EXPLAINING MOLECULE SHAPE ● squ