State whether each of the following sentences is true or false. (a) If a highly

Question

State whether each of the following sentences is true or false. (a) If a highly competent chemistry professor dissolves 0.5000 moles of sucrose in 0.5000 liters of water, the sucrose molarity in this solution is 1.000 M. (b) In a sample of N_2 gas held at constant temperature, all the molecules move at the same speed. (c) In the hydrogen atom, the electron moves on a circular orbit around the nucleus. (d) In the hydrogen atom, the 2s and 2p subshells have the same energy but they have different energies in atoms with more than one electron.

Explanation / Answer

Ans. a. True.

Molarity = Number of moles of solutes / Volume of solution in L

            = 0.5000 moles/ 0.5000 L = 1.0 moles per L = 1.000 M

Thus, the resultant sucrose solution is 1.000 M

Ans. b. False

The speed of most of the molecules lie in a close range. However, some molecules have speed at either extreme (very high speed and very low speed).

Ans. c. False.

S-orbital is spherical, not circular. So, the electrons move in a 3D spherical path.

Ans. d. False

The relative energy of the 2s and 2p subshells is the same for atoms with atomic number less than or equal to 4.    

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