Question

please someone answer the questions now 1.copper sulphate crystals lose their blue colour and turn white when heated strongly,why? 2.you are provided with 2 test tubes.one of them contains water and the other contains acid solution.how will you find out which of the test tubes contain water without tasting the solutions? 3.how will you collect hydrogen gas? 4.a student drpped a few pieces of marble in dil.HCl contained in a test tube.The evolved gas was passed through lime water.what change would be observed in lime water?write a balanced chemical equations for both th changes observed. 5.how can you find the strength of a given acidic or a basic solution? 6.write two oservations you would make when quick lime is added to water. 7.what reaction is evovled in the setting of plaster of paris into hard mass?

Answer 1

1]--> due to loss of water of crystallization
2] by putting litmus paper...if litmus turns red it is acid
3] by liting matchstick if there is pop up sound it is h2 gas
4] the lime water turns milky
5] through universal solvent
6] heat is given out...nd bubbles are formed
7] combination reaction