A compound has 39 g of potassium and 78 g of selenium. What is the mass ratio of potassium and selenium in the compound

When copper and nitrogen combine in an ionic bond, the name of the formula unit is copper nitride. T or F?

How many elements have been discovered? A. 110 B. less than 110 C. more than 110

The gas in a 250. mL piston experiences a change in pressure from 1.00 atm to 4.45 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant

6.1 Raunak took 5 moles of carbon atoms in a containe má Krish also took 5 moles of sodium atoms in another container of the same weight (a) Whose container is heavier? (b) Whose container has more number of atoms?

In some areas of the earth, the crust is squeezed and pushed upward. this is what process in that it directly forms what?

The passage of the USA Patriot Act of 2001 and the creation of the Department of Homeland Security reflect the determination of the United States government to (1) search for weapons of mass destruction in South Asia (2) increase the globalization

Is it possible for 2 different elements to have the same atomic number

How is the mole similar to a dozen?

What element with the highest electronegativity value? Cesium calcium helium fluorine

How many neutrons and electrons are in Oxygen⁻¹⁷ isotope?