「葛雷的熱情在《Reactions》一覽無遺，內容將枯燥乏味都刪除，並且所有內容都是有科學根據的」─Nature，International Journal of Science
首先葛雷先幫讀者簡單複習元素和分子兩個主題，再往下講化學反應中很重要的觀念，接下來的章節就以不同的化學反應形式分為〈Fantastic Reactions and Where to Find Them〉、〈On the Origin of Light and Color〉、〈The Boring Chapter〉等，其中講到的化學反應從麵包的發酵、繪畫顏料乾涸、草的生長，到煮沸水的過程等等平常生活中都可以接觸到的例子，而在〈The Need for Speed〉章節章，則會說明天氣、火等反應。
The long-awaited third installment in Theodore Gray's iconic "Elements" trilogy. The first two titles, Elements and Molecules, have sold more than 1.5 million copies worldwide.
With Reactions bestselling author Theodore Gray continues the journey through our molecular and chemical world that began with the tour de force The Elements and continued with Molecules. In The Elements, Gray gave us a never-before-seen, mesmerizing photographic view of the 118 elements in the periodic table. In Molecules, with the same phenomenal photographic acumen, plus beautifully rendered computer generated graphics, he showed us how the elements combine to form the content that makes up our universe, from table salt to oxygen to the panoply of colors and smells that surround us.
At last, we've reached Reactions, in which Gray once again puts his photography and storytelling to work demonstrating how molecules interact in ways that are essential to our very existence. The book begins with a brief recap of elements and molecules and then goes on to explain important concepts the characterize a chemical reaction, including Energy, Entropy, and Time. It is then organized by type of reaction including chapters such as "Fantastic Reactions and Where to Find Them," "On the Origin of Light and Color," "The Boring Chapter," in which we learn about reactions such as paint drying, grass growing, and water boiling, and "The Need for Speed," including topics such as weather, ignition, and fire.