Determining some of the Laws of Chemistry

Chemistry
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1. Which law is being used to calculate the amount of Oxygen used in a reaction?

2. If you repeated an experiment & got the same percentages, compared your results with other people who also got the same percentages which law does this illustrate?

May 4th, 2015

The first law is very simple but also very powerful. The recognition that energy is conserved, that it is neither created nor destroyed, allows the basic principles of arithmetic to be applied to the flow of energy through a system. The amount of energy at the end of a sequence of events must equal the amount at the beginning. The sums must be equal. If they aren't, an error has been made in the analysis.

While the first law deals with quantity, the second law describes the changing quality of energy as it moves through a system. Unlike quantity, the quality of energy tends to change, but only in a certain direction. The second law defines the nature of the change (although it doesn't specify how fast the change will occur).

b . this is defined by he firs law.

May 4th, 2015

Thank you for your response. To be more specific, would it be accurate to then say: 


1.  The law of conservation of mass - In every chemical transformation, an equal quantity of matter exists before and after the reaction.

2.  Avogadro's hypothesis - Equal volumes of different gases (at the same temperature and pressure) contain equal numbers of particles (??)

May 4th, 2015
the statements are true :
The Law of Conservation of Mass states that matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant. We can state this important law in another way. The total mass of the universe is constant within measurable limits; whenever matter undergoes a change, the total mass of the products of the change is, within measurable limits, the same as the total mass of the reactants.


Avogadro law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".

May 4th, 2015

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