Final answer:
A pocket mask is positioned on a victim's face by aligning it and pressing down to ensure a tight seal, providing a barrier during CPR.
Step-by-step explanation:
A pocket mask is used during CPR and is placed over the victim’s face to provide a barrier between the rescuer and the victim while delivering rescue breaths. To properly place a pocket mask, align the mask over the patient's face with the pointed end covering the nose and the rounded end over the chin. Ensure a tight seal by pressing down on the mask with your thumbs while lifting the jaw to keep the airway open. The masks are typically equipped with a one-way valve to prevent the exchange of fluids and contaminants.