Chemistry do these i am so stressed i have 14 essays due tomorrow

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

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

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude