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Miracle Learning Centre Chemistry Tuition Question on Particulate Nature of Matter. (O Level Chemistry Tuition/ IP Chemistry Tuition)

1 Zinc nitrate, Zn(NO3)2 produces zinc oxide, oxygen gas and nitrogen dioxide gas when it is decomposed. (a) Write the balanced chemical equation for the reaction. _____________________________________________________________ (b) When nitrogen dioxide is cooled, it forms a yellow liquid and then pale yellow crystals. These crystals are heated and the temperature is measured every minute. The following graph can be drawn.

(i) Describe the arrangement and movement of the molecules in the region C – D. __________________________________________________________ (ii) Name the change that occurs in the region B – C. ________________________________________________________ (d) Nitrogen dioxide, oxygen and water react to form dilute nitric acid. Briefly describe how zinc nitrate crystals could be prepared from dilute nitric acid and zinc oxide. _______________________________________________________________ _______________________________________________________________ Miracle Learning Centre Answer to Chemistry Tuition Question on Particulate Nature of Matter. (O Level Chemistry Tuition/ IP Chemistry Tuition) 1a)2Zn(NO3)2  2ZnO + O2 + 4NO2 1b)The molecules are packed closely together and but are disorderly. The molecules are able to move throughout the liquid. 1c)Melting. 1d)1. Add zinc oxide to the hot acid and stir. 2. Remove the excess zinc oxide by filtering. 3. Heat the solution of zinc nitrate in an evaporating dish to produce a saturated solution and cool. 4. Filter the crystals and dry them by squeezing them between filter paper. Learn from our Chemistry Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Chemistry tuition, Physics tuition, Maths tuition and Science tuition Classes.