To write a prediction on a flame test, you need to state the color of the flame that you expect the sample to produce based on the known properties of the element present in the sample. For example, if you know that the sample contains sodium, you could predict that it will produce a bright yellow flame. Make sure to explain the reasoning behind your prediction using the spectral properties of the element.
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The flame test for nickel produces a blue-green color flame.
Cobalt gives a blue flame test while chromium gives a green flame test.
Lithium carbonate produces a bright red flame color when subjected to a flame test.
Calcium typically produces an orange-red flame when subjected to a flame test.
A yellow flame in a flame test usually indicates the presence of sodium in the sample being tested. Sodium typically produces a bright yellow flame when heated.