Which of these are examples of mixing and separating?
removing seed casings from grains
a soda bottle bubbling when it is opened
a bright copper statue turning green from weathering
removing salt from seawater
water decomposing to oxygen and hydrogen

The correct answer is- A soda bottle bubbling when it is opened.

Soda bottle is prepared when CO₂ ( carbondioxide) is dissolved with H₂O (water) at very high temperature. Thus, it is called mixing.

As we know that solubility is directly proportional to pressure. This means that at very high pressure, CO₂ is soluble but when the bottle is opened at atmospheric pressure, solubility of CO₂ is decreased ( as pressure is decreased). This causes the release of CO₂ in the form of bubbles. Thus, it gets separated in this way.

Thus, soda bottle bubbling when it is opened is an example of mixing and separating.

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