As part of an investigation, students combined substances in a beaker to observe chemical reactions. They measured the mass of each substance before and after the reaction. The mass of the reactants was 50.0 grams and the mass of the products was 48.2 grams. Assuming the students did not make any careless errors, what likely explains the change in mass?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds

What is the equation fort the alkaline zinc/manganese dioxide cell. a) anode b)cathode c)overall equations.