¿qué unidad se usa para medir el tamaño de un átomo?

What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filling it from the bottom up?

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

What is the mass of naoh that would have to be added to 500 ml of a solution of 0.20 m acetic acid in order to achieve a ph of 5.0?