In a Cambridge IGCSE question paper, the following question was asked:
Describe the reaction of sodium with cold water. Include the observations that can be made.
I was thinking of writing that "sodium explodes" when it comes into contact with water, but the marking scheme says that point is unacceptable:
Common incorrect answers include "sodium bursts into flames or explodes"
Doesn't sodium react explosively in cold water (at STP/RTP) or is that reaction limited to water at warmer temperatures?