Open QuestionIf two substances are mixed and a new substance is formed, what type of change is it?671views
Open QuestionHow do chemical weathering and deposition contribute to the formation of the features shown here?739views
Open QuestionWhen the color, smell, and taste of the mixture changed, I knew a chemical ___ had taken place.879views
Open QuestionCiara's bike has rusted, which means that the iron in the metal changed to rust. What has occurred?882views