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When a mixture fizzes, it forms bubbles and sometimes makes hissing sounds. It is a sign that a new substance has been formed and indicates a chemical reaction.

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An aroma is a chemical reaction when a mixture changes it smell while being mixed. The smell changes as the new substance is forming. The smell can go from no smell to a good or bad smell.

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There are many colors in our world like red, orange, yellow, green, blue, and many more. When you are using fire and mixing it with salt solutions, you will get different results with it. One of those results is the change in color. The colors can change from orange, green, blue, red, etc. It is also one way of showing a chemical reaction.

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The temperature of an item or object indicates how hot or cold the item is. You can measure temperature in Fahrenheit and Celsius.

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A solid takes up all the objects matter. It is a hard object and sometimes very heavy. If a solid is formed during the process of a salt solution mixing with fire, it is considered a chemical reaction.

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If a new substance is formed during a chemical reaction, it is considered a physical reaction. This indicates that salt solutions and fire can make mixtures that form new substances.

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In this video, an efferdent tablet is being dropped into water causing a reaction that makes the efferdent tablet disintegrate and makes an effervescence that causes the water to rise and makes bubbles.

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In this video, cookies are being baked and it causes the smell to change from being flat out cookie dough to being baked in an oven which causes a change in smell.

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Two liquids are being mixed together causing a change in the color from being clear water to dark purple liquids.

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Eggs stay in a fridge which makes it cold. In this video, they put the egg over the stove which causes a change in the temperature of the egg going from cold to hot.

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When water freezes, it becomes colder and colder until it is completely frozen. This video shows a time-lapse of water freezing in a cup until it is frozen ice.

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In this video, a scientist is making different compounds combine with each other to make different substances that create different reactions and cause more and more substances to be made.