Why does summer receive more daylight hours than winter

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Classify this reaction: 2al+n2-> aln.