Apiece of lead with a mass of 25 g causes the water level in the graduated cylinder to rise 3ml. what is the density of the piece of lead?

Density is given by the formula , where D is equal to the density, m is mass of lead and v the volume of lead.

Since we are not given an initial volume  the change in volume is caused by the piece of lead which is a 3ml.

Therefore,

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.