efers to the following experiment, which was set up and observed periodically for 1 hour:After 1 hour the following observations were made EXCEPTAThe solution had become paler blueBThe zinc rod had decreased in sizeCThe volume of the solution had decreasedDPink particles had collected at the bottom of the beaker

The colour of the solution observed after 30 minutes of placing zinc metal to coppersulphate solution isa) Blueb) Colourlessc) Dirty greend) Reddish Brown

Which amongst the following can be observed when zinc granules are added to dilute hydrochloric acid taken in a test tube?

Place a few pieces of granulated zinc metal in a test tube.n Add 2 mL of sodium hydroxide solution and warm the contentsof the test tube.n Repeat the rest of the steps as in Activity 2.3 and record yourobservations

Observations from Four Experiments that Involve MixturesExperimentProcedureObservationIWhite powder is added to water.Gas is given off.IIA solution is heated until it boils.Vapour rises, and solute is left in the beaker.IIIYellow powder is added to water.Yellow powder is added to water.IVA pure solution is added to another pure solution.A powder appears at the bottom of the beaker.In which two of the experiments did a physical change occur?

Shorten to 100 words: The experiment includes the process of decantation between copper solid and the supernatant. During this procedure, some copper solid was lost when the supernatant solution was separated from the precipitate. This could have been due to the incomplete separation of the solution and the precipitate which could have led to the loss of copper solid recovered (final mass) and therefore reduction of percentage yield. Another possible source of error could be that the reaction between CuSO4 and Zinc powder was incomplete. This indicates that the amount of zinc added to the solution was less than the stoichiometric amount required to completely displace all the copper ions. As a result, the actual amount of copper solid produced was less than the theoretical yield. This discrepancy reduced the percentage yield of copper.