Chemistry, 21.07.2019 23:30 leslie122372

List a few ways that would lead you to believe a chemical reaction has occurred

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There are many ways which can lead us to believe a chemical reaction has occurred. I am discussing few of them.

Change in Color:
Few reactions proceed with the change in colour. When Bromine Water (yellow-Brown) is treated with unsaturated compounds, the color disappear as the reaction is completed.

Gas Production:
Some reactions proceed with the elimination of gas i.e. CO₂ , H₂, N₂, H₂O e.t.c.

Temperature Change:
Some reactions evolve or absorb heat when proceed. This change is the evidence of progress of reaction.

Thin Layer Chromatography:
Very important technique in detecting the progress of reaction by determining the number of spots for UV active compounds on TLC plate. Even non UV active compounds can be detected by using other locating agents.

Instrumental Techniques:
Modern techniques like IR, MS, NMR, UV spectroscopy can be used to detect the progress of reaction.

Answer from: Quest

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

Answer from: Quest

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

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