8 CO + 17 H2 → C8H18 + 8 H2O 4 FeS + 7 O2 → 3Fe2O3 + 4 SO2

Please help me this is so important I will brain list the right one or first one.

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

What energy is it when you flip on a switch on a lamp