Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?
F2(0)+ Na(s) - NaF 2(s)
O
F2(g) + Ca(s) —> CaF2(0)
F2(g) + Na(s)
> NaF 200
F2(g) + Ca(s)
CaF2(s)
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Predict the products butane (c4h10) + oxygen —>

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Stage in which a typical star has completely stopped fusion