How many moles is 1 billion (1 x 10^9) molecules O2

The technetium-99 nuclide radioactively decays by beta emission. write a balanced nuclear chemical equation that describes this process.

Which of the following elements is less reactive than the others? Bromine (Br) Oxygen (O) Selenium (Se) Sulfur (S)

If the atomic number of an element is 6 and its mass number is 20, how many neutrons are in the atom's nucleus?

Do you think the continents will ever rejoin to form another supercontinet like pangaea? why or why not?

7. A movable piston contains a sample of 680 mL of neon gas with a temperature of - 5 degrees C. When the piston is heated the sample expands to a volume of 1.32 L. What is the new temperature of the neon gas? 8.

What is an element that has more valence electrons than fluorine and less energy levels than sodium?

Why can't we breathe in pure oxygen for long

In warm water conditions, female offspring hatch from eggs laid by painted turtles. Male offspring are produced under cold conditions.

It takes 53.0 J to raise the temperature of an 11.0 g piece of unknown metal from 13.0∘C to 24.2 ∘ c. What is the specific heat for the metal?

What happens to the velocity of a sound wave in air if the temperature of the air increases