John Dalton is considered the father of the atomic theory. In 1800s he had came up with 5 concepts regarding the atomic theory.
Hope I helped.
Answer : The correct option is C.
Explanation :
Enthalpy of reaction : It is defined as the changes in heat energy takes place when reactants go to products. It is denotes as
.
= Energy of product - Energy of reactant
is positive when heat is absorbed and the reaction is endothermic.
is negative when heat is released and the reaction is exothermic.
In the given potential energy diagram, the energy of product at higher level and energy of reactant at lower level. The
for this reaction will be positive.
So, the enthalpy of reaction is defined as the difference of the energy of the reactants and the energy of the products.
I'm assuming A, but it says modern, so..
Answer:
1) some of the gas maybe metal but non metal directly refers it self to not begin metal
2) gases are present in only air . non metals are available in solid form too
Answer:
The activation energy of an endothermic reaction
A) must be greater than the required △H
Explanation:
endothermic reaction : Are those which absorbs heat from the surrounding
.<em>This energy provide activation energy for the reaction to occur</em>.
So activation energy becomes more than enthalpy.