Ans:
from the product / reactant solution
from the environment when no solution is involved
Endothermic reactions are those reactions that proceed with the absorption of heat energy. In this case, the enthalpy of the reactants i.e. the initial energy is lower than that of the products. Therefore, energy needs to be supplied in order to break the bonds in the reactants and allow the reaction to proceed. This energy can be absorbed either from the environment when no solution is involved or from the product reactant solution.
For example, electrolysis of water which produces H2 and O2 is an endothermic reaction. Here, energy is absorbed by water in the form of electricity (current) to split it into corresponding products.
Answer:
The evidence goes against A. Expanding Earth and B. Contracting Earth
<span>Generally negative ions is known as anion and positive ions is known as cation. Anions will gain an electron to fill in an electron shell but cations will lose an electron to fill in an electron shell so that cation by losing the electron the ionic mass will be lower where as for anion by gaining an electron the ionic mass will be higher so that atom will be larger.Therefore negative ions tend to be larger than positive ions.</span>
The bond order of a diatomic element with six bonding electrons, six non-bonding electrons, and 2 anti-bonding electrons is 2 whose formula is( bonding electrons-anti bonding electrons)/2.
<h3>What is an element?</h3>
An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
Learn more about element,here:
brainly.com/question/14347616
#SPJ2
Answer:
corrosiveness is a chemical property