In short, yes one kg (kilogram) is bigger than one pound. Technically, a kilogram is equal to 2.20462262 pounds (1kg = 2.20452262£) and in the inverse a pound is equal to 0.45359237 kilograms (1£ = 0.45359237kg).
1/2 pound of chicken would contain 1-3 pieces, depending on the size and type of chicken. If it were a breast, it would probably be 1 piece. You would probably get 2-3 legs or thighs in 1/2 pound of chicken.