#Reflection 2

In this chemistry lesson I learned about describing the chemical formula of compound from the relative number of atom present. I learn the difference between the monoatomic and polyatomic element. Monoatomic is when we're combining two single element (metal and non metal) such as N and the atomic mass charge is +1 and O with charge of -2. But polyatomic element is we combine two element (non metal and metal) but the non-metal is with both charge for atomic number and atomic mass. The non-metal element of the monoatomic will be change with ide in the back of the word (oxygen become oxide). But the non-metal element of the polyatomic will be change with ate or ite in the back of the word (depends on the charge of the atomic number and atomic mass). I also learn to find the number of atom in the chemical formula of compound. for example if we react Na+1 with O-2 it will become Na2O so there are 2 atoms of Na and 1 atom of O. Another example is if we combine Li+1 with CO-2 (atomic mass) +3(atomic number) it will become Li2CO3 which is lithium carbonate. And we know that there are 2 atoms of lithium and 1 atom of carbon with 3 atoms of oxygen. However if the formula of the monoatomic is Cu(OH)2, we need to multiply 2 with the inside of the bracket which is O and H, which means there are 1 atom of copper, 2 atoms of oxygen and 2 atom of hydrogen. And if the formula of the polyatomic is CuSO4 . 5H2O, we need to multiply 5 with 2 for the H and move 5 to O, so it will become 1 atom of copper, 1 atom of sulphur, 9 atoms of oxygen and 10 atoms of hydrogen.