Qual o tipo de ligação que ocorre na mólecula KBr

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

What are the two major rules associated with polarity