a copper of mass 120g is heated in an enclosure to a temperature of 12.5c. it then taken out bof enclosure and hold in air for a min and dropped carefully into a copper calorimeter of mass 105g containing 200g of water of 20c% the temp of the water rises to 25c. calculate the rate at which heat is boiling from the pieces of copper​

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

List the path of the respiratory system