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5070/42 Answers Q1)Table: 23.6, 0.3 Tick on 23.6 and 23.8 Mean 23.7 Moles of HCl: 0.01398 Moles of Magnesium Hydroxide: 0.00699 Mass of Mg(OH)2: 0.405(42) Mass of Milk Of Magnesia : 11.7 % = 3.46~ Q2) Chromatography se karna tha Electro Chemistry: Cathode: pink deposits Anode : Colorless gas. Observation with inert: blue color fades away COLOR CHANGE WITH Cu electrodes: No change. Mass of Anode Decrease Mass of Cathode increase Graph Question: Color Change of Sol; Colorless to Brown Q) Why did addition of CaCO3 stopped rxn. A) Acid was nuetralized... Anomalous Point : 100,11.0 Volume: 13.0~15.0 (Depends on Graph) Time : 85~95 (Again Depends on Graph) The gradient at 50s was steeper than At 400s Reason : More molecules, more effective collision, high Rate of Reaction. PREPARATION OF SALTS: a) 1. Excess CuCO3 in Sulfuric acid. 2.Heat/Stir 3.Filter 4. CRYSTALLISATION 5. WASH AND DRY. b) 1. Silver Nitrate + Ammonium Chloride 2. Mix, Stir. 3. Filter 4. Wa...

Chemistry ATP 5070/42 -Practice recent past papers all variants (2017-2018) TOPICS to focus -MOLES -ACID,BASES AND SATLS -EXPERIMENTAL CHEMISTRY -Rate of Reaction -Identification of ions and gases -Electrolysis -Titration Especially identification of ions and gases , moles and  experiments should be on your fingertips. Revise these topics if you’re done with past papers Experimental chem notes https://drive.google.com/open?id=1hYKUKtuBsqGVsmAT5gcP0e_cyt2YXm5B   Resources Elements tests https://drive.google.com/open?id=1n3uHgOq7wpYUBx-fjkIrUBwFDJd4oazM Common questions https://drive.google.com/open?id=1fYMHIr5AHpYbqYnIZqj38OWvjL8XlXUi Identification of ions and gases extensive practice and notes https://drive.google.com/open?id=1nusu7DYQsqx2yWBk8L4LxiIy_o2UFr_3 Moles extensive practice and notes https://drive.google.com/open?id=1YXf07iPsGAyJYwSp1vl0YWhhPsTGmPy0 Paper 4 (Alternative to Practical) Tips • When plotting graphs, you should b...