65 grams of calcium equal how many moles?

The election configuration has of an element is 1s^2 2s^2 2p^1. How many valence electrons does the element have?

What is the conjugate acid of HS-? A. S- B. H2S C. HS- D. S2-

Which statement describes the particles of an ideal gas according to the kinetic molecular theory? (1) The gas particles are arranged in a regular geometric pattern. (2) The gas particles are in random, constant, straight-line motion.

How is the ionization energy, E, related to a period of elements?

Which of the following is true for a cell that has a nucleus? A. It will not have nuclear membrane. B. It will not have a nucleolus. C. It will not have ribosomes. D. It will not have a nucleoid.

c. When we heat water up by the Bunsen burner, what temperature is the boiling water? After 10 minutes

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?