How does a student need to adjust the bunsen burner in order to change a luminous yellow flame into a non luminous blue flame?

Open the air holes

Explanation:

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In this case, by opening the air holes we allow more oxygen to enter in contact with the fuel so a hotter blue nonluminous flame appears as a product of the complete combustion of the fuel. On the other hand, by closing the air holes, an incomplete reaction undergoes, so a luminous yellow flame comes up.

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answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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the increase of protons   hope this