Silver Mirror Test
Silver Mirror Test - Related Videos
06:22
Motor Learning in Mirror Drawing
0 Views •
2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Colloquially, the terms learning and memory encompass a broad range of behaviors and mental systems, everything from learning to tie a shoe to mastering calculus (and a lot in between). Experimental psychologists have divided up learning mechanisms into groups that seem to have different properties, and that seem to rely on different brain systems. A major division is between declarative and non-declarative memory, roughly, the...
10:32
Robotic Mirror Therapy System for Functional Recovery of Hemiplegic Arms
0 Views •
Cited by 26 •
2016
We developed a real-time mirror robot system for functional recovery of hemiplegic arms using automatic control technology, conducted a clinical study on healthy subjects, and determined tasks through feedback from rehabilitation doctors. This simple mirror robot can be applied effectively to occupational therapy in stroke patients with a hemiplegic arm.
05:45
A Method to Fabricate Disconnected Silver Nanostructures in 3D
0 Views •
Cited by 9 •
2012
Femtosecond-laser direct-writing is frequently used to create three-dimensional (3D) patterns in polymers and glasses. However, patterning metals in 3D remains a challenge. We describe a method for fabricating silver nanostructures embedded inside a polymer matrix using a femtosecond laser centered at 800 nm.
03:18
Aggression Assay: A Method to Study Aggressive Behavior of Zebrafish in Response to a Mirror
0 Views •
2023
The article describes an assay for studying zebrafish’s aggression. The method uses a simple mirror and observes zebrafish’s behavioral response towards its own reflection in mirror.
07:23
Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride
0 Views •
Cited by 2 •
2020
This paper aims to present a method to form smooth and well-controlled films of silver chloride (AgCl) with designated coverage on top of thin film silver electrodes.
FAQs
The diamminesilver(I) ion acts as the oxidizing component of Tollens’ reagent. An aldehyde transfers electrons to this silver complex, converting silver(I) into metallic silver. At the same time, the aldehyde undergoes oxidation under alkaline conditions. This coupled electron transfer makes the assay a clear example of a redox reaction involving a complex ion.
The alkaline reaction environment supports oxidation of the aldehyde to a carboxylate rather than leaving the product in its neutral acid form. It also provides the chemical conditions in which diamminesilver(I) ions can be reduced to silver metal. Consequently, the organic transformation and the visible metal deposition occur as linked parts of the same assay.
Aldehydes can reduce the silver(I) complex while undergoing oxidation, so they generally produce the characteristic metallic silver coating. Most ketones do not undergo this corresponding reaction under the test conditions and therefore do not give the same result. The contrast makes the assay useful for qualitative functional-group analysis rather than for measuring the amount of compound present.
A sample is brought into contact with Tollens’ reagent in a clean glass vessel, and the vessel is examined for formation of a reflective silver coating on its inner surface. The observation is qualitative: development of the coating supplies evidence consistent with an aldehyde reaction. The glass surface is important because it provides the location where the deposited metal becomes visible as a mirror.
The principal observation is whether metallic silver forms a reflective coating inside the glass vessel. A visible mirror indicates reduction of the diamminesilver(I) ions and oxidation of the tested aldehyde under the assay conditions. Because the method is qualitative, the observation is used to support functional-group identification, not to determine concentration or establish a complete compound structure.
The experiment connects several chemical ideas in one observable outcome: aldehyde oxidation, reduction of a metal ion, complex-ion behavior, and deposition of a solid metal film. In organic chemistry instruction, it provides a practical example of functional-group analysis. More broadly, it helps place qualitative identification methods within the study of oxidation-reduction chemistry and metal deposition.