If 1.25 gram of sodium carbonate reacts with 10.0 ml of 1.25 m hcl. what is the limiting reactant

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

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

Chemistry worksheet - i am not sure what they are asking for exactly?