What is the job of a scientist

Suppose that you stir a green powder into a clear liquid. The liquid turns green. You leave the room and come back later to observe that the top of the liquid is clear again. A green substance has settled on the bottom of the container.

When a hypothesis is tested and shown to be incorrect is the experiment a failure?

Which family in the periodic table has elements that are all radioactive

If the half life of a first order reaction is 24 days. Calculate the rate constant for the reaction

How can people protect themselves from hazardous weather?

An aqueous solution is made from a molecular compound rather than from an ionic compound. If some ions are present in solution, which best describes the solute? A. a weak electrolyte B. a nonelectrolyte C. a strong electrolyte D.

Which of the following measures the radiation given off by atoms per second?

What is the name of the outermost layer that forms a boundary around the outside of each cell

What does an ionic compound form?

How many electrons in an atom could have these sets of quantum numbers n=7 l=3 ml=-1?