3.4. Covalent bonding and coordinate (dative covalent) bonding
A subsection of Chemistry, 9701, through 3. Chemical bonding
Listing 10 of 93 questions
Complete the table to show the total number of unpaired electrons in the 3d and 4s orbitals of each isolated gaseous atom. number of unpaired electrons 3d 4s Cr Mn Fe  Solid potassium manganate(, KMnO4, decomposes on heating to form manganese(oxide, potassiummanganate(and a colourless gas. Construct an equation for this reaction. Explain the origin of colour in transition element complexes. The reaction scheme shows some reactions of [Cu(H2O)6]2+. [Cu(H2O)6]2+ precipitate A solution of B CuCO3NaOHreaction 3 reaction 2 reaction 1 excess NH3solution of C reaction 4 CH3CO2HWrite the formulae of precipitate A, complex ion B, compound C  Identify a suitable reagent for reaction3. Write an equation for reaction4. Describe two visual observations that would be made during reaction 4. Platin, Pt(NH3)2Cl 2, is a neutral complex of platinum(. Explain why Pt(NH3)2Cl 2 has no charge. Pt(NH3)2Cl 2, displays cis-trans isomerism. Draw the structure of trans-platin. State its shape and the Cl –Pt–Cl bond angle. shape Cl –Pt–Cl bond angle  Cis-platin is an effective anti-cancer drug. Describe the action of cis-platin in this role. The use of cis-platin can cause side effects so nedaplatin has been developed. Nedaplatin can be synthesised from cis‑platin, Pt(NH3)2Cl 2, by replacing the two chloride ion ligands with a single bidentate ligand as shown. Suggest the structure for nedaplatin. O– –O O Pt(NH3)2Cl 2 cis-platin + nedaplatin  
9701_w18_qp_41
THEORY
2018
Paper 4, Variant 1
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Complete the table to show the total number of unpaired electrons in the 3d and 4s orbitals of each isolated gaseous atom. number of unpaired electrons 3d 4s Cr Mn Fe  Solid potassium manganate(, KMnO4, decomposes on heating to form manganese(oxide, potassiummanganate(and a colourless gas. Construct an equation for this reaction. Explain the origin of colour in transition element complexes. The reaction scheme shows some reactions of [Cu(H2O)6]2+. [Cu(H2O)6]2+ precipitate A solution of B CuCO3NaOHreaction 3 reaction 2 reaction 1 excess NH3solution of C reaction 4 CH3CO2HWrite the formulae of precipitate A, complex ion B, compound C  Identify a suitable reagent for reaction3. Write an equation for reaction4. Describe two visual observations that would be made during reaction 4. Platin, Pt(NH3)2Cl 2, is a neutral complex of platinum(. Explain why Pt(NH3)2Cl 2 has no charge. Pt(NH3)2Cl 2, displays cis-trans isomerism. Draw the structure of trans-platin. State its shape and the Cl –Pt–Cl bond angle. shape Cl –Pt–Cl bond angle  Cis-platin is an effective anti-cancer drug. Describe the action of cis-platin in this role. The use of cis-platin can cause side effects so nedaplatin has been developed. Nedaplatin can be synthesised from cis‑platin, Pt(NH3)2Cl 2, by replacing the two chloride ion ligands with a single bidentate ligand as shown. Suggest the structure for nedaplatin. O– –O O Pt(NH3)2Cl 2 cis-platin + nedaplatin  
9701_w18_qp_43
THEORY
2018
Paper 4, Variant 3
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Questions Discovered
93