Which of the following is a characteristic of an exothermic reaction?
Release of heat
An exothermic reaction is one in which the products have lower energy than the reactants, so the excess energy is given out to the surroundings, mainly as heat (sometimes also light or sound). The enthalpy change is therefore negative, \(\Delta H < 0\), and the temperature of the surroundings rises.
Common examples include combustion of fuels, neutralisation of acids by bases, and respiration. Absorption of heat describes an endothermic reaction, while a reaction with no temperature change would be neither.
Fire extinguishers emit which gas?
In the following reaction, fill in the blank.
Acid + Base → _______ + Water
Ozone is an ______ of oxygen.
What is the common characteristic of the elements of the same group in the periodic table?
Which amongst the following is not a cation?
Which of the following bonds are weakest in nature?
What is the chemical name of saltpetre?
The reaction of Copper Sulphate and Iron produces Iron Sulphate and __________.
What is the bond angle (in degrees) in the structure of a benzene molecule?
Fire extinguishers emit which gas?