What is the the best estimate for the density of sphere A? 2.7 g/mL
1.4 g/mL
1.7 g/mL
1.3 g/mL

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

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