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Signs of chemical reactions may be:

- Gas release

- Formation of a precipitate

- Change of color

- Change of odor

- Change of pH

- Change of aspect

- Change of viscosity

- Change of the temperature

- Visible formation of new compounds

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10y ago
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10y ago

Signs of chemical reactions may be:

- Gas release

- Formation of a precipitate

- Change of color

- Change of odor

- Change of pH

- Change of aspect

- Change of viscosity

- Change of the temperature

- Visible formation of new compounds

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15y ago

Change of colour, change in temperature, formation of precipitation, formation of gas, change in form (like burning). Chemical reactions are often irreversable unlike physical changes.

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12y ago

Bubble

Burn

Rust

Fizz

Change color

Change temperature

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11y ago

If a chemical reaction has taken place, the mixture will normally start to fizz or bubble and sometimes there is a smell

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Q: How do you know if a chemical reactions has taken place?
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