Why does an ice cube melt when you hold it in your hand? A. Heat is transferred from your hand to the ice cube.

B. The ice cube radiates heat to your hand.

C. Heat from the ice cube is transferred to your hand.

D. Your hand transfers temperature to the ice cube.

Idont know. if you want an answer you need to give us some context dude.

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻

Iwill try to solve that problem for you

So the c: h: n ratio is 5: 7: 1 and the empirical formula for nicotine is c5h7n.