Which of the equations below represents the correct balanced equation?
a. mg (s) + hcl (aq) --> mgcl2 (aq) + h2 (8)
b. mg (s) + 2hcl (aq) --> mgcl2 (aq) + h2 (8)
c. 2mg (s) + hci (aq) --> mgcl2 (aq) + h2 (8)
d. 2mg (s) + 2hcl (aq) --> mgcl2 (aq) + h2 (8)

b. Mg (s) + 2HCl (aq) --> MgCl2 (aq) + H2

Explanation:

A subscript applies only to the element it is attached to while coefficients apply to all elements in a compound.

"a" has 1 atom of each element on the left but 2 Cl on the right.

"c" has 2 Mg, 1 H, & 1 Cl on the left but 1 Mg, 2 H, and 2 Cl on the right.

"d" has 2 atoms of each element on the left but only 1 Mg on the right.

"b" is the only answer with equal numbers of atoms on the right and left sides of the equation.

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.

the temperature of the gas, in k, not celsius.