(1) There are bursts of malt fragrance in the garden-style factory building of the company, because the molecules contained in the malt fragrance are constantly moving and spreading around, making people smell the malt fragrance.

(2) In the process of beer brewing, wort can be converted into alcohol and carbon dioxide to generate new substances, which is a chemical change; Yeast is a magician, and it acts as a catalyst in this reaction.

So, the answer is: (1) c; (2) chemistry; Catalysis.