Final answer:
Chemical contraceptives that kill or deactivate sperm in the vagina are called spermicidal methods.
Step-by-step explanation:
Chemical methods of contraception such as creams, gels, foams, suppositories, and films, which reduce the survival of sperm in the vagina, are categorized as spermicidal methods. Spermicides are chemicals placed in the vagina that kill sperm, preventing them from fertilizing an egg. These methods are distinct from barrier methods that physically block sperm from entering the uterus, hormonal methods that prevent ovulation, and emergency contraception used after unprotected sex.