Balancear por tanteo las siguientes ecuaciones químicas 1. Mn2O7 --> MnO2 + O2
2. PbS + O2 --> On + SO
3. Fe(OH)3 + H2SO4 --> Fe2(SO)3 + H2O
4. P4 + Fe2 --> PF2
5. C + O2 --> CO2
Por favooor, alguien que me ayude rápido

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented