A fourth solution of copper (II) sulfate solution is added to the investigation. The fourth solution causes the light bulb to shine more intensely than Solution 2 but less intensely than Solution 3. Which statement BEST describes the concentration of Solution 4?A It has a lower concentration than Solution 1.B It has a higher concentration than Solution 3.C It has a concentration that is higher than Solution 1 and lower than Solution 2.D It has a concentration that is higher than Solution 2 and lower than Solution 3.

Which of the following is a true solution ?A) NaCl in sulphur dioxideB) Copper in silverC) Salt in petrolD) Mud in water

When a zinc plate is placed in an aqueous solution of copper sulfate, elemental copper forms, as represented by the equation above. Which of the following represents the reduction half-reaction of the

A drop of concentrated nickel(II) sulfate solution, which is green, is placed on moistfilter paper on a microscope slide and the ends of the slide are connected to a 24 V DCpower supply. After ten minutes,A a blue colour has moved towards the negative terminal and a yellow colourtowards the positive terminal.B a blue colour has moved towards the positive terminal and a yellow colourtowards the negative terminal.C a green colour has moved towards the negative terminal but there is no othervisible change.D a green colour has moved towards the positive terminal but there is no othervisible change.

The saturated CuSO 4(aq) shown above is leftuncovered on a lab bench at a constanttemperature. As the solution evaporates, 1.0 mLsamples of the solution are removed every threedays and the [SO42] in the samples is measured.It is observed that the [SO 42] in the solution didnot change over time. Which of the following besthelps to explain the observation?(A) As the solution evaporates, Cu 2+(aq) andSO42(aq) leave the beaker along with thewater molecules.(B) As the solution evaporates, the dissolution ofCuSO4(s) in the beaker decreases.(C) The evaporation of water is endothermic, somore CuSO4(s) dissolves exothermically inthe solution, which increases the [SO42].(D) As water evaporates, more CuSO 4(s)precipitates out of the solution in the beaker.Unauthorized copying or reuse ofany part of this page is illegal. GO ON TO THE NEXT PAGE.-17-

What happens when a piece of(a) zinc metal is added to copper sulphate solution?(b) aluminium metal is added to dilute hydrochloric acid?(c) silver metal is added to copper sulphate solution?Also, write the balanced chemical equation if the reactionoccurs