Which of the following is a physical change?   adding acid to milk to form sour cream  adding enzymes to milk to form cheeseadding bacteria to heated milk to form yogurt  adding sugar to milk to form sweetened milk

Adding sugar to milk to formula sweetened milk

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.