These chemical reactions are named exothermic.
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Endothermic reactions need heat.
Not all acid reactions give off heat. Some acid reactions are endothermic, meaning they absorb heat from the surroundings instead of releasing it. Examples of endothermic acid reactions include the reaction of citric acid with water.
One example of a chemical reaction that produces heat and light is the combustion of hydrogen gas in air to form water. This reaction releases energy in the form of heat and light as the bonds between the atoms are broken and reformed.
Those reactions are said to be exothermic.
Combustion reactions typically give off heat. This process involves the rapid combination of a substance with oxygen to produce heat and light energy.