A bactericidal agent is a substance that has the property of killing bacteria. like antibiotics, as well as an antiseptic agent.
Antibiotics are molecules that have the property of killing (bactericidal) or limiting the spread (bacteriostatic) of bacteria.
An antiseptic is a product that suppresses or prevents the growth of bacteria or viruses. It is used on the surface of the body (we speak indeed of disinfectants for a use on medical devices or others).
The right answer in order are:
Statement 1: Time
Statement 2: Composition of the microbes; the number of populations
Statement 3: pH ; temperature level
Statement 4: Concentration of the agent; mode of action against the microbes
Statement 5: Organic and inorganic matter