Chemistry Aqa A Level Study Guide Graded A+

what is cisplatin {Ans: a complex of platinum (II) with two chloride ion ligands and two ammonia ligands in a square planar shape}Chromium summary {Ans: }Fehlings solution with an aldehyde {Ans: CH3CHO + 2Cu2+ + 2H2O -> CH3COOH + Cu2O + 4H+}Put the carbocations in order of stability {Ans: primary< secondary < tertiary}Draw the equation when limited NH3 reacts with Co. Colour of precipitate formed. {Ans: Blue ppt}Draw a tetrahedral complex with copper and a larger ligand {Ans: }What does Cr become when H2O ligands are substituted for NH3 ligands? What colour is this? {Ans: [Cr(NH3)6]3+ Purple solution}what is DNA made up of {Ans: lots of monomers called nucleotides which bond together to form two polynucleotide strands}Explain how a polyamide is made (draw diagram) {Ans: Dicarboxylic acid reacts with diamine. Water molecule is released and Nitrogen bonds with carbon to form the amide group.}What type of bonding is involved in complex formation? {Ans: Co-ordinate bonding}Write equation for Cr2O72- + Fe {Ans: }Why is Al2O3 different? {Ans: ionic but shows covalent character}Will a catalyst affect Kc and Kp? Why? {Ans: No, catalysts only affect the time it takes