In the reaction Mg (s) + 2HCl (aq) → H2 (g) + MgCl2 (aq) , what is the species oxidized, species reduced, oxidizing agent, reducing agent?

And what is the Oxidation half-reaction and Reduction half-reaction?

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device

Is 343 in the sequence -5, -2, 1, 4, 7

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)