A student added zinc powder to copper sulfate in a polystyrene cup and used the data she collected to calculate the enthalpy change of the reaction when 1 mole of copper sulfate reacts with 1 mole of zinc. However, she found that her value was lower than the published data for this reaction. Suggest two reasons why this might be.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

12 is probably the typical age for a first kiss but i think its to young.

"electrical energy" transforms to "thermal energy".hope my answer has you : )