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An unknown substance undergoes a chemical change that gives off heat. Which statement is true? The types of molecules of the substance before and after the chemical change are different, and the change was endothermic. The types of molecules of the substance before and after the chemical change are the same, and the change was exothermic. The types of molecules of the substance before and after the chemical change are the same, and the change was endothermic. The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.

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wangalores
D.

In a chemical change, the molecules in the reactants interact to form new substances. Exothermic reactions give off heat.
kapoorprachi783

The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.

The correct answer is option D.

Is a substance giving off the heat a chemical change?

We call this an endothermic reaction. The emission of light from a very hot substance is called incandescence. Many chemical reactions give off light and/or heat. A familiar example of a chemical reaction that gives off both heat and light is the combustion of propane in a gas stove or BBQ.

Why do some chemical reactions give off heat?

Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products that are used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in the temperature of the reaction mixture.

Learn more about Exothermic reactions here: https://brainly.com/question/24808802

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