Write the chemical formula for the compound formed by each pair of positive and negative ions. ba2+ and no−3: al3+ and co2−3: k+ and po3−4

a)

b)

c)

Explanation: A neutral compound is to be formed to get a stable compound. The charges have to be balanced , thus the valencies of ions are exchanged and the neutral compounds result.

These all are ionic compounds which result by complete transfer of electrons from metals to non metals.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.