Please help!! 1. Although atoms can be rearranged in physical or chemical changes they are never
or This is referred to as the law of conservation of mass.

2.CO2 likely has ( covalent / ionic ) bonds and KFl is likely to contain ( covalent / ionic ) bonds.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

i don't know people like to fight everywhere rip.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.