! in the reaction 4al+_o2= 2al2o3, what coefficient should be placed in front of the

to balance the reaction?

a. 1

b. 2

c. 3

d. 4

Ido not understand. 

Neither model is able to show the reactivity of potassium.

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o

The bergeron process.