The on the left side of an equation must be balanced with the Addams on the right side of the equation

Why does his teacher ask him to balance the equation by including the correct coefficient

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg

110 g of water (specific heat = 4.184 j/g c) and 100 g of a metal sample (specific heat = 0.397 j/g c) are heated from 25 degrees c to 75 degrees c. which substance required more thermal energy?