For the following questions, name the ionic compound using a periodic table and the polyatomic ion chart. be sure to use correct spelling. capitalize the first letter of each word. be sure to check if it's binary, ternary, and if it has a transition metal before you go to name it. naf mg(no3)2 ca3(po4)2 na2o pbi2 (the third letter is capital i) cu(so4)

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

The fact that the total amount of energy in a system remains constant is a(n)

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it