To make sure no cracks are in the crucible and also to remove any moisture present in the crucible by the process of heating.
578.23 miles = 930.6 kilometers (Rounded up to the nearest tenth.)
Answer:
Sodium reacts with the oxygen in air to form sodium oxide, and traces of yellowish sodium peroxide. ... Probably, the reaction with atmospheric oxygen will be faster, because I have never seen sodium metal turning whitish on exposure, though it does lose its lustre and and reactivity (just the surface).
