Answer:
Anthracite: The highest rank of coal. This coal is hard, brittle, and black lustrous. It is often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.
Explanation: There are four ranks of coal
Coal rank measures the carbon content which is in correlation with calorific value and metamorphic grade. It has a very high carbon (over 90%) and low volatile content (below 5%)1.
Answer:
atoms of isotopes of an element have different numbers of neutrons.
Explanation:
isotopes have the same number of protons, but different numbers of neutrons.
Answer: Option (b) is the correct answer.
Explanation:
In a chemical reaction, the bonds between the reactant molecules tend to break leading to the formation of new bonds to produce products.
So, in order to break the bonds between the reactant molecules, energy is required to overcome the attraction between the atoms.
To form new bonds, energy gets released when two atoms come closer to each other. Hence, formation of bond releases energy.
As in the given reaction it is shown that < 0, that is, enthalpy change is negative. Hence, energy is released as it is an exothermic process.
Thus, we can conclude that the statement energy released as the bonds in the reactants is broken is greater than the energy absorbed as the bonds in the products are formed, is true about the bond energies in this reaction.
Answer:
For the drawing, please refer to the attachment below
Explanation:
In this E1 reaction, chlorocyclopentane in the aquaeous solution releases Cl as anion leaving carbon C in the ring positively charged. The intermediate which appears is now highly reactive and sensible for oxygen electron pair in water molecule . This intermediate acts like a Lewis acid; it gives away hydrogen to available electron pair on the oxygen creating hydronim ion as the result of protonation of the water molecule. The final product is cyclopentene.
Mass i think hope and this helps u