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https://www.youtube.com/watch?v=vW9of4JYHYO

https://www.youtube.com/watch?v=ANOtoVBAzDU

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Mixing acid and base.

Digesting food.

Cooking an egg.

Rusting of Iorn

Baking a cake

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https://www.youtube.com/watch?v=w5Y452eiHC8

https://www.youtube.com/watch?v=cmrj2X061FM

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Boiling water.

Mixing sand and water.

Breaking a glass.

Dissolving sugar and water.

Crushing a pen

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Gas Is very Flammable and it's Methane Concentration level is 5-10% Which is Flammability Level is Level 2

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Air Re-fresheners have over 20 Toxic chemicals

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- Reactivity
- Toxicity
- Flammability
- Heat Of Combustion
- Chemical Stability

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A Single Quarter Overall Weight (Mass) Is 5.670 grams

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Gold Overall weight (Mass) is 12.4 kg

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- Color
- Density
- Volume
- Mass
- Boiling Point
- Melting Point

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How Physical Changes Are Different From Chemical Changes

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How Physical Changes Are Different From Chemical Changes

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There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

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Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.