In the single replacement reaction between magnesium and HCl what reaction resulted from inserting the lit splint into the test tube mouth ?​

Exothermic reaction

Explanation:

Burning magnesium is an exothermic reaction because when magnesium and oxygen collide to form new bonds , energy is released into the surroundings.

Magnesium and Hydrochloric acid is exothermic as the temperature increases.

Magnesium reacts with dilute hydrochloric acid in a conical flask which is connected to an inverted measuring cylinder in a trough of water. The volume of hydrogen gas produced is measured over a few minutes, and the results are used to plot a graph

Explanation:

Hope it will help you

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.