11. The bond energy for a double bond between two carbons is 611 kJ/mol, and the bond energy for a triple bond between two carbons is 837 kJ/mol. Why is this? * A. additional electrons repel each other, increasing the distance between atoms, and increasing bond energy.

B. additional bonds require less energy to break, so the bond energy is higher.

C. additional bond Arequire more energy to break, so the bond energy is higher.

D. additional electrons attract each other, decreasing the distance between atoms and decreasing the bond energy.

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?

The zinc within a copper-plated penny dissolves in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can reach the zinc). the reaction between the acid and the zinc 2h+(aq)+zn(s)→h2(g)+zn2+(aq) . when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °c is 0.947 l at a total pressure of 743 mmhg . (vapor pressure of water is 23.78 mmhg at 25 °c .) what mass of hydrogen gas is collected? answer in appropriate significant figures