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change in color
change in odor
formation of gas
formation of percipitate
release or absorption of energy

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Change in smell
change in color
change in temparature
formation of a precipitate
formation of a gas

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EVIDENCES :
1. Change of Color
2. Change of Odor
3. Formation of Precipitation
4. Formation of Gas
5. Temperature Change

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Fresh food gets spoiled when kept unconsumed for a long time

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Color Change- if one were to observe the rusting of metal over time, one would realize that the metal has changed color and turned orange
Temperature change- Cookies bake faster at higher temperatures and Bread dough rises more quickly in a warm place than in a cool one.

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Color change- if one were to observe the rusting of metal over time, one would realized that the metal has changed color and turned orange.

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Color change- if one were to observe the rusting of metal over time, one would realized that the metal has changed color and turned orange.

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Formation of precipitate -
Ex:
Precipitation in water pipes: Hard water consists of many impurities. Magnesium and calcium oxides are generally found in water pipes as precipitates.

Rain and snow: These two are formed when a heated humid air mass collides with a cooler air mass.

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Cookies bake faster at higher temperatures

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Change in Temperature
- Bread dough rises more faster when placed in warm area.
- Brownies bake faster at high temperatute.

Change in color
- Rusting of metal, from silver color it turns to be orange due to rust.
- Blue litmus paper turns red when placed in acid.

Change in Odor
- The smell of rotting egg that turns into sulfur smell.
- Unsual odor in air outside during thunderstom which is caused by lightning because of chemical reaction in air, smelling like a coal.

Formation of Gas
- Cake batter rising is caused by a gas-forming reaction between an acid and baking soda (sodium hydrogen carbonate).

Bubbling and Fizzing
- When you mix baking soda and vinegar, you will see fizzing.

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reaction between potassium chloride and silver nitrate

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Fire/explosion
Ex:
Fireworks - The sulfur and charcoal act as the fuel, while the potassium-nitrate acts as an oxidizer, which is crucial for the creation of fireworks.

Bonfires

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Souring milk

Heating sugar to form caramel

Rusting of iron

Mixing acid and base

Digesting food.

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Change of smell
Ex:
Rotten egg, during this process chemical changes or reactions happen.

Decomposition of waste

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A change in color is also another evidences characteristic of a chemical reaction like for examples is the rusting  Roofs or rusting of Iron

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A change in color is also another evidences characteristic of a chemical reaction like for examples is the rusting  Roofs or rusting of Iron

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example:
rusting of metal
blackening of surfaces of cut vegetables and fruits

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reaction between baking soda and lemon juice

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Formation of gas - the chemical reaction produces gas as it product
Ex:
The reaction between baking soda and lemon juice (citric acid). If you mix baking soda with lemon juice (or vinegar), both substances quickly react to form bubbles.
Bubbles are made of carbon dioxide gas.
Cake batter rising is caused by a gas-forming reaction between an acid and baking soda

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Odor is generated when substances change composition. A very common example is rotting of eggs, that have a very different odor from fresh eggs. During the process of rotting, chemical reactions take place and egg's composition changes. Another example is that of odor from the sewers.

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examples:
spoilage of foods

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caramelization of sugar

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The formation of bubbles when two liquids are mixed usually indicates that a gas has formed.

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The formation of bubbles when two liquids are mixed usually indicates that a gas has formed.

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When two or more compounds or elements are mixed and a scent or odor is present, a chemical reaction has taken place. For example, when an egg begins to smell, (a rotten egg) a chemical reaction has taken place.

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Many reactions produce a gas such as carbon dioxide, hydrogen sulfide, ammonia, or sulfur dioxide. Cake batter rising is caused by a gas-forming reaction between an acid and baking soda (sodium hydrogen carbonate).

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By comparing the energy absorbed when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. Chemical reactions that release energy are called exothermic.

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baking soda added to vinegar
creates carbon dioxide gas

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chemical reactions:precipitation. The precipitate forms because the solid (AgCl) is insoluble in water. For example, sometimes the pipes in our homes get clogged because precipitates of magnesium and calcium oxides have deposited themselves within the pipes.

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rusting of iron.

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Vegetables and fruits turns brown when expose to air ( oxidation reaction )