Assignment Calculate the number of mole in 1kg of caco3(ca=40,c=12 o=16)

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.