50. 0g of lead are placed in a calorimeter with 100. 0mL of water. As a result the water's ΔT is 5. 0℃ which calculates to 2100J of heat absorbed by water, what is the ΔH (change in heat) of the lead

there is none because earth is stationary and flat.

b.

the accuracy of the data.

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.