91.   -- Sunlight and heat cause a chemical reaction within the plastic, causing some of the lead to separate as dust.

92.   A battery is basically an electrical generator that uses a chemical reaction instead of a mechanical dynamo to create current.

93.   A chemical reaction in the containers causes them to burst into flame when they fall to the ground.

94.   A chemical reaction enhances the prints, he said.

95.   A catalyst is a substance used to speed up or increase the output of a chemical reaction.

96.   A catastrophic chemical reaction could result that could melt your pipes and spew noxious fumes into your home, Blair said.

97.   A chemical reaction between water and rotting vegetable matter release carbon dioxide and form carbonic acid.

98.   A chemical reaction, a haunting reminder.

99.   A fuel cell is a device that produces electricity directly from a chemical reaction of hydrogen and oxygen.

100.   A fuel-cell car runs on electricity produced from the chemical reaction of hydrogen and oxygen.