Why do scientists sometimes discard theories?

An atom has a mass number of 30 and 16 neutrons. What is the atomic number of this atom?

Make inferences about what you think would happen to other living things, such as plants and animals, in an area exposed to nuclear radiation.

Where is most of the mass found in an atom

What is the difference between a substrate, ligand, reactant and product?

Which feature indicates that Mars resides in the inner region of the solar system? A. It is the coldest planet in the solar system. B. It has a rocky surface that one could firmly stand on. C. It contains a faint system of 13 rings. D.

32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide. if 20 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react, what is the mass of sulfur trioxide in the container after the reaction

Water exhibits high levels of cohesion due to the polarity of the molecule (positively and negatively charged sides). given this information, which type of bond is responsible for water's cohesion and which atoms interact to form this bond?

scientist have found many marine fossils on the mountain far from any ocean or sea what is the best explanation for these fossils

The change in energy needed to change the state of a substance is

What is the main goal of sustainable agriculture? A. To rely heavily on mechanization, pesticides, and fertilizers B. To produce cheap and abundant food at a high cost C. To feed a growing world without damaging the ecosystem D.