How do you know when a reaction has stopped?

Answer 1

Its quite hard to say really but if you have a line graph displaying the results all you need to look for is when the line goes straight. In other words when the variable is constant (at the same point continuously)

e.g.

volume of hydrogen (cm^3) against time!

as the volume of hydrogen increaces so does the time untill it reaches a point when the volume of hydrogen is constant!

Answer 2

At equilibrium, the reactants produce product and the product converts into the reactant. There is no change the concentration of reactants and products due to the same rate of reaction. Since chemical equilibrium continues and never go to stop, therefore, chemical equilibrium is a dynamic equilibrium.

Answer 3

Because the two substances become exhausted when there is nothing to react with. They become 'spent'. Sort of like a room full of balloons. If you keep popping them eventually there will be no balloons left.

Answer 4

One way to determine if a reaction has stopped is to monitor if there is a change in color, temperature, or formation of a precipitate. Another method is to use analytical techniques like chromatography or spectroscopy to track the progress of the reaction over time. Additionally, you can check if there is no further consumption of reactants or formation of products by using techniques like titration or measuring pH.