How many milligrams of a 20mg sample of cesium-137 remain after 60 years

The balanced equation for the gaseous state oxidation of ammonia is shown below. 4 nh3 + 5 o2 → 4 no + 6 h2o how many moles of o2 are required to react with 1.2 mole of nh3?

A crate is at rest on the ground. What force or forces are acting on the crate? A. There are no forces acting on the crate. B. The weight of the crate is acting downward on the crate. C.

What is meant by the ground state of an atom? What is meant by the ground state of an atom? All of the quantum numbers have their lowest values (n = 1,ℓ = mℓ = 0). The electrons are in the lowest state allowed by the uncertainty principle.

What is the total number of orbitals associated with the principal quantum number n = 3?

You have ice cubes in your freezer at home. The ice cubes melt into water. This type of change is called a ... O a. nuclear change O b. physical change O c. chemical change

Consider the reaction pathway graph below which indicates the energy that must be absorbed to initiate the reaction

Which statement best explains why a metal atom and a nonmetal atom are most likely to form an ionic bond? A.

What does a formation equation show

The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant. Deuterium, D, is an isotope of hydrogen. 2 HD (g) ⇌ H2 (g) + D2 (g) Kc = 0.

Which would not be classified as a pure substance?