In a lab about the activity series, a solution of copper(ii)chloride is placed in a test tube with zinc metal. if zinc is higher up on the activity series, it will produce a reaction and replace the copper. bits of copper are seen in the bottom of the test tube. a good conclusion would be? a) zinc is lower on the activity series because there is no evidence of a reaction. b) zinc is higher on the activity series because there is no evidence of a reaction. c) zinc is lower on the activity series because there is clear evidence of a reaction. d) zinc is higher on the activity series because there is clear evidence of a reaction.

Option D, Zinc is higher on the activity series because there is clear evidence of a reaction.

Explanation:

It is very clear that a metal which is higher in activity will replace a metal having lower activity.  

Since, Zinc has higher activity than copper, it is very sure that it in a copper chloride solution it will replace copper and produce zinc chloride solution leaving behind copper as residue.  

Residues of copper is a clear evidence of reaction  

The chemical equation for this reaction would be -

Hence, option D is correct

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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