5. The number of bonds an atom can form is represented in an electron dot
diagram by
A. pairs of dots
B. unpaired dots
C. total number of dots

Answer

420,000 Joules

Explanation

When ice cools from -10 t0 -20, it releases energy in form of heat. This energy is given by;

Quantity of heat (Energy) = mθC

Where m ⇒ mass of ice

θ ⇒ Change in temperature.

C ⇒ specific heat capacity of ice (water) = 4200 J/Kg/K

∴ Energy = mθC

= 10 × (-10 - -20) × 4200

= 10 × 10 × 4200

= 420,000 Joules