1. Which of the following happens when an ionic bond is formed?(1 point)

Two atoms share an electron.

Two atoms attain equal electronegativities.

One atom becomes more electronegative than another atom.

One atom pulls an electron from another atom.


2. Which statement about bonding is correct?(1 point)

Forming bonds requires energy and is endothermic.

Breaking bonds releases energy and is endothermic.

Forming bonds releases energy and is exothermic.

Breaking bonds requires energy and is exothermic.

3. Fluorine is the most electronegative element on the periodic table, which means that, in an ionic bond, fluorine will always (1 point)

share electrons unequally with other elements.

share electrons equally with other elements.

pull electrons away from other elements.

give electrons away to other elements.


4. The bond energy between carbon and oxygen is 358 for a single bond (C–O) and 745 for a double bond (C=O). Why is the bond energy higher for double-bonded carbon and oxygen (C=O)?(1 point)

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

Additional bonds require more energy to break, so the bond energy is higher.

Additional electrons attract each other, decreasing the distance between atoms, and increasing bond energy.

Additional electrons repel each other, increasing the distance between atoms, and increasing bond energy.


5. Use the bond energies to answer the question.

H–H = 432
H–O = 467
O–O = 146
O=O = 495

H2 (H–H) combines with O2 (O=O) to become hydrogen peroxide (H2O2) bonded as such: H–O–O–H. Which option shows the difference in total bond energy between the reactants and the products?

(1 point)

−927

1,080

153

−153