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An endothermic reaction is one that consumes heat.
Yes, it is possible: thermal decomposition and electrolysis.
It is Heat that is 'given off' by a chemical reaction.
A candle gets its power to give off heat and light from the chemical reaction that occurs when the candle wax (usually made of hydrocarbons) is burned. The heat generated from the flame melts the wax, which then vaporizes and combusts with oxygen in the air to produce heat and light energy.
Yes, temperature has an effect on the speed of the reaction. Also most chemical reactions create heat. I feel that it is not exactly correct to say that most chemical reaction create heat. That is true for exothermic reactions, which give off heat, but endothermic reactions absorb heat instead.
Endothermic reactions need heat. Exothermic reactions give off heat.
exothermic reactions-gives off heat
The burning of a candle gives off heat. This is because the chemical reaction of the wax with oxygen releases energy in the form of heat and light.
A reaction that gives off energy is an exothermic reaction. The reaction will give off energy in the form of either heat or light An example of an exothermic reaction would be the curing of concrete. One chemical reaction that will give off heat is the mixture of Caustic Soda and water. The water dissolves the Caustic Soda which in turn generates heat. There are two types of reactions. Exothermic reactions give off heat, and endothermic reactions require that heat be added to make them work. Be careful with exothermic reactions. A rapid, energetic exothermic reaction is called an "explosion".
It is sign of chemical reaction because smell and heat is produced.
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.
Some reactions give off heat (exothermic), others absorb heat (endothermic). All reactions increase entropy.