How can scientists determine when a radioactive substance will no longer be dangerous

What is the mass number of an atom of copper that has 36 neutrons?

Calculate the molarity of 80.0 ml of a solution that is 0.92 % by mass nacl. assume the density of the solution is the same as pure water.

What is the precipitate that will form from the reaction of barium chloride dihydrate with sodium sulfate decahydrate?

How many significant figures are in 0.000128?

How does a fan use electrical energy? (a) The fan turns electrical energy into energy of motion. (b) The fan turns wind energy into electrical energy. (c) The blades of the fan spin and produce electrical energy.

All of the following are possible sources of error in a scientific investigation except for O measuring materials such as mass and volume incorrectly. o recording experimental data incorrectly. o having a constant in your experiment.

Do polyatomic ions have fixed charges?

Which type of organism is used to make bread rise when baking? A. plants B. protists C. yeast D. bacteria

How many particles are in 3.55 moles of Aluminum Sulfate

Major geological events that occur when plates shift suddenly and released stored energy: A. Volcanic eruptions B. Earthquakes C. Antarctic plate D. Spreading ridges