To make an observation we need to record information. tactile audible visual all of the above

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction