Answer: D. Energy is absorbed, and kinetic energy increases.
Explanation:
An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding.
An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding.
When a liquid boils , it converts to gaseous state by absorbing energy from surroundings.
Kinetic energy is the energy possessed by an object by virtue of motion of particles.
Thus when liquid molecules absorb energy, the molecules gain kinetic energy and start moving faster in gaseous state.
the speed of arrow is 83m/per second
that means
83metres = 1 second
●The arrow would cover the distance of 83 metres in 1 second
may this helps you
bye
Atoms that have lost or gained one or more electrons are called ions.
Consider the halogenation of ethene is as follows:
CH₂=CH₂(g) + X₂(g) → H₂CX-CH₂X(g)
We can expect that this reaction occurring by breaking of a C=C bond and forming of two C-X bonds.
When bond break it is endothermic and when bond is formed it is exothermic.
So we can calculate the overall enthalpy change as a sum of the required bonds in the products:
Part a)
C=C break = +611 kJ
2 C-F formed = (2 * - 552) = -1104 kJ
Δ H = + 611 - 1104 = - 493 kJ
2C-Cl formed = (2 * -339) = - 678 kJ
ΔH = + 611 - 678 = -67 kJ
2 C-Br formed = (2 * -280) = -560 kJ
ΔH = + 611 - 560 = + 51 kJ
2 C-I Formed = (2 * -209) = -418 kJ
ΔH = + 611 - 418 = + 193 kJ
Part b)
As we can see that the highest exothermic bond formed is C-F bond so from bond energies we can found that addition of fluoride is the most exothermic reaction
