what is the question ? I don't see any question but a few words
Answer:
CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + 212 800 cal
Step-by-step explanation:
CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + 212 800 cal
The heat is on the right-hand side of the equation, so the reaction is releasing heat.
The reaction is <em>exothermic</em>.
A is <em>wrong</em>. Your sign of ΔH is wrong, because graphite is the more stable form of carbon. We must add energy to graphite to convert it to diamond, so the process is<em> endothermic</em>.
B and D are <em>wrong</em>, because a ΔH > 0 indicates an <em>endothermic</em> reaction.
Answer:
I FALSE II FALSE III TRUE
Explanation:
Stament I : Because the efective nuclear charge for Mg is greater than that for Be, the first ionization energy of Mg is greater than that of Be. FALSE
The first ionization energy decreases as we go down a group because of the shielding efect electrons have on the farthest electron that is going to be ionized. That is the ionized electron is shielded from its nucleus because we are filling higher energy levels.
Statement II :The first ionization enery of O is less than that of N because in O we must pair electrons in the 2p orbital. FALSE
Again we have the shielding effect of electrons on the first electron to ionize. This effect does not have anything to do with the pairing of electrons in the 2p orbital. since as we go across a row in the periodic table we are increasing the number of electrons. The first electron to ionize thus will see less of its nucleus and therefore O will have a lower first ionization energy.
Statement III : The first ionization energy of Ar is less than that of Ne because a 3p electron in Ar is farther from the nucleus than a 2p electron in Ne. TRUE
This is another way to say the shielding effect is responsible for the first ionization energy being in Ar is less than that of Ne. The electron is shielded from a nucleus with a higher atomic number and it is farther away ( 3p vs 2p orbital)
Answer:
Explanation:
The amount of gravity is directly proportional to the amount of mass of the objects and inversely proportional to the square of the distance between the objects. Gravity is a force that increases the velocity of falling objects - they accelerate.
