Lập phương trình hoá học và cho biết tỉ lệ các chất trong phương trình sau: a) Na + O2 Na2O b) CuSO4 + Al Al2(SO4)3 + Cu
c) Al + Cl2 AlCl3 d) BaCl2 + AgNO3AgCl+Ba(NO3)2

Write a brief passage describing a neutral atom of nitrogen-14 (n-14). describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. use the periodic table to you. 14 protons and eletrons since its a neutral atom

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins