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A fizz may be seen when a gas is being released. This is also referred to as an effervescence.

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The six factors that could help determine if a chemical reaction has taken place or not.

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When baking soda is added to vinegar, a fizz/gas is produced. Together, these two substances create a gas that indicates a chemical reaction has occurred.

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In the experiment below, you can see that once the baking soda is added to the vinegar, a fizz is released, thus, inflating the balloon.

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Vinegar + Baking Soda + Balloons = FIZZY FUN! | Kids Science Experiments | Science for Kids

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A new smell may be apparent during a chemical reaction.

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When bacon is cooked on a frying pan, a smell is given off that wasn't there before.

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While it is impossible to experience a new aroma through a video, here is a video of bacon sizzling on a frying pan to give a visual of the chemical reaction.

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1 Minute of Bacon Cooking: "Is There Any Sound More Relaxing?"

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During a chemical reaction, the reactants may change color.

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Some silly putty are able to change color when the heat of your hands get involved.

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Here is a video of silly putty changing colors when the man plays with it. This occurs because the heat of his hands is touching the putty.

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Heat Sensitive Thinking Putty Changes Color

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A change in the temperature of reactants may take place during a chemical reaction.

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When a log, is burned, it is hotter than it was before.

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Here is a video of logs burning in a campfire. THe logs are on fire and the temperature has increased.

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1 Minute and 24 seconds: Logs burning in 4K

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Another way to detect a chemical reaction, is to see if a solid has formed. This is also known as precipitate

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When you mix the drink, red bull, and milk, a solid is formed.

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In the video below, you know a chemical reaction has taken place because when the two reactants are mixed, they form a solid.

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What Happens If You Mix Milk And Red Bull?

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Chemical reactions will always produce a new substance.

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When a banana rots, a chemical reaction has occurred and a new substance has formed.

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Below is a video of a banana rotting. Before the banana rotted, it was a bright yellow-y color and it was ripe. After the chemical reaction, the banana is no longer yellow or ripe.

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A chemical reaction takes place when a bath bomb is dropping into water. During the reaction, carbon dioxide is produced, causing fizzing throughout the water.

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A chemical reaction takes place when sugar is burned. The heat causes the atoms in the sugar to combine with the oxygen in the air, forming new groups of atoms. This is an exothermic reaction, therefore, energy is released in the form of smoke and black soot.

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When the Statue of Liberty was originally assembled, it was a dull, brownish color, as a result of the natural color of the copper plates inside of it. Ever since the statue was first brought to America, it has turned more and more green each year. This indicates a chemical reaction between the oxygen, copper plates, and water.

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When the packaging of the hand warmer is removed, a open system is present because air enter the pouch and reacts with iron and water. This is also a exothermic reaction because heat energy is released. This chemical reaction can be detected by feeling the warmth of the hand warmer after the chemical reaction has taken place.

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When copper sulfate and sodium carbonate are mixed, precipitation takes place and a solid is formed. It is immediately visible and it is very easy to tell that a chemical reaction has occurred.

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Before going in the oven, the cookies are not cookies, just batter. When the cookies are out of the oven, they are in solid form, there is a new aroma, they are hotter than before, and most apparent of all, a new substance is formed. It is extremely easy to tell that a chemical reaction has occurred while baking cookies.