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These are the six different indicators that a chemical reaction is happeneing

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Ammonia with Hydrogen Chloride to form ammonium chloride. This reaction is usually shown by a shorthand method called a  chemical  equation. The chemical equation for this reaction is NH3 + HCl =  NH4Cl. This is a chemical reaction because a new substance is formed. Below Is the solution which is ammonium chloride.

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copper and oxygen were your reactants copper oxide would be the new substance made and it would be called your product.
reactant+reactant=product. Below Is copper oxide which is the product of the example reaction (copper + oxygen).

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The product started out as a solid, it is transforming to a liquid by melting. This is a chemical reaction because it changed forms. You know that a chemical reaction happened because it changed forms (precipitated).

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Process Melting Ice-Cubes North Pole Ice Melting Tank in Ice Cube Melting Ice Cube Melting Fast Motion Melting Ice Cube Experiment Melting Ice-Cubes in Water Sound of Melting Ice Melting Antarctic Ice Sheet Which Ice Cube Melts Faster Melting Lake Ice Science Ice Cube Melting Project Research About Melting Ice NASA Melting Ice Ice Melts

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Earlier, that was a liquid. Now it is a solid. a chemical reaction took place when the water froze. It changed substance and became a solid. This is a chemical reaction because it changed forms (precipitated).

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The creation of ice cubes is a chemical reaction. It is an exothermic reaction which means it gives off its heat. When the water is poured into the ice cube trays, it is warmer than when it comes out of the ice cube trays. The heat is lost because the final solution is cold. This is a chemical reaction because a change in temperature takes place.

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The melting of ice cream is an endothermic process. An endothermic reaction is any reaction that absorbs heat. The ice cream absorbs the heat which melts the ice causing the scoop to melt (which is not fun). This is a chemical reaction because the product is absorbing heat through an endothermic reaction.

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When you add food coloring to a solution. the solution will change colors. This is because the food coloring solution is very concentrated an contains very large amounts of the coordinating color. The color spreads to the rest of the solution. When the solution changes color, it causes a chemical reaction because a new chemical was created.

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New copper is a beautiful rosy-pink color. Before long, however, it changes to a darker russet-brown. Under certain circumstances, it may turn red, black or blue-green. The humidity helps to tarnish the color. Erosion and acid rain can also speed up the process of tarnishing the copper.

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When sugars are exposed to heat, they become very reactive. When putting patties on the grill, a similar thing happens and a very good smell is created. This is a chemical reaction because there is an aroma. A very nice aroma.

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This is a picture of a candle. When scented candles are burnt, they produce a very nice smell or aroma. Candles smell because they have fragrance oils in them that put off the smell once the candle is lit.  Some candles may have a certain amount of essential oils in them without the fragrance/essential oils they would not have a smell besides the smell of the wax itself that puts off little to no smell at all. When the aroma is created, this is a chemical reaction because you can smell it when you couldn't smell anything before. Which is why the oils only release when the candle is lit.

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This is another example of fizzing. The tablet dissolves and creates bubbles that rise to the top of the water and creates a chemical reaction in which fizzing takes place. We know that the chemical reaction is a fizz because we can see the bubbles that were created. Any fizz, indicates a chemical reaction.

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When she mixes the Baking Soda (which has sodium bicarbonate) with the soap and also with the citric acid (orange juice), the solution starts to bubble and expand. This is because of the citric acid and the Sodium Bicarbonate (Baking Soda) doing a chemical reaction. The product is a carbon dioxide gas. The evidence that proves a chemical reaction is occurring is when the solution starts to fizz and create bubbles.

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Homeschool Science Experiment Citric Acid & Baking Soda

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This video was uploaded from an Android phone.