write the equation for working out energy for a changing state
Answers
Answer:
To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in temperature of the liquid (degrees Celsius).
Explanation:
Some chemical reactions release energy by heat. In other words, they transfer heat to their surroundings. These are known as exothermic reactions: "Exo" relates to external, or outside, and "thermic" means heat.
Some examples of exothermic reactions include combustion (burning), oxidation reactions (rusting) and neutralization reactions between acids and alkalis. Many everyday items like hand warmers and self-heating cans for coffee and other hot beverages undergo exothermic reactions.