Answer:
For isotopes, the difference between the mass number and number of neutrons is constant.
Explanation:
Isotopes are atoms with the same atomic number but different mass numbers.
Number of neutrons in an atom can be obtained by subtracting the atomic number from the mass number.
So in other words , isotopes are atoms for which the difference between the mass number and number of neutrons is constant.
For example, Hydrogen,Deuterium and Tritium are isotopes of Hydrogen in which the difference between mass number and number of neutrons is 1.
Answer:A) they invented a writing system C) they wrote a constitution and D) they panted Cotten and farmed
Explanation: that’s what they did when making there own land
Answer:
The energy harnessed in nuclei is released in nuclear reactions. Fission is the splitting of a heavy nucleus into lighter nuclei and fusion is the combining of nuclei to form a bigger and heavier nucleus. The consequence of fission or fusion is the absorption or release of energy.
Introduction
5= chemicals
6= hormones
Don't know the other ones.
Answer is: <span>a compound classified as ester.
Reaction of synthesis of estrers</span><span> is calling the </span>Fischer esterification<span>, this is reaction of carboxylic acid with an alcohol in the presence of a </span>dehydrating <span>agent (usually sulfuric acid):
R-COOH + R-OH </span>⇄ R-COOR + H₂O.
Esters are less polar than alcohols and can make <span>hydrogen bonds.</span>