Question

SAT化学问题 20分 急！

The oxygen atom in a water molecule has a -2 oxidation state.
为什么是对的？解释下原因，谢谢

Answer 1

这句话的意思是：水分子中的氧原子的化合价是 -2 状态。

这是对的，因为：两个氢原子和一个氧原子形成共价化合物水，一个氧原子通过和两个氢原子共用两个电子对形成共价键，而共用电子对偏向于较大的氧原子，所以氧原子的电荷就会显出“负电荷”的电性，且氢原子锁提供的“两个”电子偏向了氧原子，所以氧原子的化合价是 -2 。

Answer 2

The Hydrogen atom is +1 state and a water molecule has two Hydrogen atoms.

Answer 3

yeah ,beause in this molcule the oxygen is linked with two hyndrogen atoms .with the electrons of hydrogen was obsorbed by the oxygen ,and circled around the oxygen mostly .so ...