Why the partial charge on H in HF is more positive than the partial charge on H in HBr

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Gymnast always perform on padded mats. how does the mats protect the gymnast

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)