When gases are released from a reaction what type of change has occurred?
2 answers:
<u>Answer:</u>
<em>A chemical change has occurred. </em>
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<u>Explanation:</u>
A chemical change is accompanied by a change in the chemical composition of the substance.
A color change, formation of a precipitate, evolution of a gas , temperature change are the indications of a chemical change.
For example
Here we see the formation of a precipitate or an insoluble solid
A chemical reaction is accompanied by a change in temperature.
Reaction in which heat is evolved is an exothermic reaction and reaction in which heat is absorbed is called as endothermic reaction.
Combustion reaction is an example in which heat and light is given off and it is exothermic.
Some reactions we see gas gets evolved. For example electrolysis of water produces Hydrogen and oxygen gas.
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Answer : The concentration of a solution with an absorbance of 0.420 is, 0.162 M
Explanation :
Using Beer-Lambert's law :
As per question, at constant path-length there is a direct relation between absorbance and concentration.
where,
A = absorbance of solution
C = concentration of solution
l = path length
= initial absorbance = 0.350
= final absorbance = 0.420
= initial concentration = 0.135 M
= final concentration = ?
Now put all the given value in the above relation, we get:
Thus, the concentration of a solution with an absorbance of 0.420 is, 0.162 M