First to answer these 3 questions will get brainleist! :) Asap (Science)

Question 2: These are meteoroids that enter a planet's atmosphere causing a visible streak of light-- the correct answer meteors.

Question 3: These are small rocky or metallic objects traveling through space. most are fragments from a comet or asteroid-- the correct answer meteoroids.

Question 4: Non-manmade objects that orbit the solar system's planets. There have been approximately 180 of these discovered-- natural satellite (moon). *I'm not 100% sure this one is correct.*

Explanation:

I hope this helps you!! :)

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.