What is the total energy change for the following reaction: H2 + I2 -> 2HI?
Given:

H-H bond: 436 kJ/mol

I-I bond: 151 kJ/mol

H-I bond: 297 kJ/mol

A. +297 kJ/mol

B. +7 kJ/mol

C. -7 kJ/mol

D. -290 kJ/mol

Hno3(aq) → h+(aq) + no3−(aq). picture ii best represents the strong acid hno3. strong acids are strong electrolytes

Yes it would be a physical change.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf