Preparar HNO3 0.5N en 100ml (buscar en Hamilton las propiedades del acido concentrado) ¿densidad, % de pureza?

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

  the mississippians were considered to be  horticulturalists, which means they were