Noun. 1. addition reaction-a chemical reaction in which one molecule is added to another. chemical reaction, reaction - (chemistry) a process in which one or more substances are changed into others; there was a chemical reaction of the lime with the ground water. 1  Facebook. 2  Twitter.
Kettlestone is a village and civil parish in the English county of Norfolk. It covers an area of 7.55 km2 (2.92 sq mi) and had a population of 177 in 85 households at the 2001 census, increasing to 197 at the 2011 Census. For the purposes of local government, it falls within the district of North Norfolk.
Other stones have frequently been reported to be the size of a baseball or even a small grapefruit. How would you like to be hit by one of these? The largest hailstone reported in the United States fell in a storm in Potter, Nebraska, in 1928. It was round and hard and weighed a pound and a half with a circumference of seventeen inches, just about the size of a softball. However, the largest hailstone in the world that has ever been found was in India after a hailstorm on March 17, 1939. This stone weighed seven and one-half pounds. Scientists wonder if perhaps this stone was not really several stones that had joined to make one.