Ans: Decomposition
A decomposition reaction is one in which a compound breaks down into thwo or more smaller compounds.
The given reaction is:
NaHCO3 + H2O → CO2 + NaOH + H2O
In this reaction sodium bicarbonate breaks down to carbon dioxide and water. Therefore, this represents a decomposition reaction.
Particles of the substance have the most kinetic energy when the substance is(a)1. A gas. The part of the graph that represents where the substance has the least amount of potential energy is labeled(b)1. Solid.
Gas molecules have the highest average velocities among the three states of matter so gas has the highest kinetic energy. During freezing, a substance loses a lot of potential energy so solid has the least potential energy.
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The statement that correctly describes how telescopes have changed over time is 'B'
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Answer:
Proust concluded that the elements in a chemical compound always present in the same ratio by mass.
Explanation:
In English, this finding became known as the Law of Definite Proportions.
For example, a 100 g sample of copper(II) sulfide always contains 66.46 g of copper and 33.54 g of sulfur.
The mass ratio in CuS is
Cu/S = 66.46/33.54 = 1.982/1