Cuando reaccionan 2 moles de aluminio con 9 moles de ácido clorhídrico), es correcto afirmar que se produce: * A.3 moles de AlCl3 y 4,5 moles de H2
B. un exceso de aluminio, 3 moles de AlCl3 y 2moles de H2.
C. 2 moles de AlCl3 y 3 moles de hidrógeno (H2)
D. un exceso de ácido clorhídrico (HCl), una mol de AlCl3 y una mol deH2

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Why do cells appear different in distilled water than they do in 10% salt water?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.