When the chemical energy in the coal is burned it is converted to.
a. heat energy
b. electrical energy
c. transitional energy
d. mechanical energy

What is the formula for the compound dinitrogen pentoxide? a. n4o5 b. n5o4 c. n4o6 d. n5o2 e. n2o5

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon