Question

what kind of bond is formed when lithium and fluorine combine to form lithium fluoride?
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redox
polar covalent.
nonpolar covalent.
ionic.
previous answers
correct
the complete transfer of an electron from lithium to fluorine results in a stable compound in which both atoms have full outermost
part f
gaseous hydrogen burns in the presence of oxygen to form water.
2h₂ + o₂ → 2h₂o + energy
which molecule is oxidized and what kind of bond is formed?
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hydrogen, polar.
oxygen, nonpolar.
oxygen, polar.
hydrogen, nonpolar

Explanation:

• Oxidation is the loss of electrons. In the reaction \(2H_{2}+O_{2}\to 2H_{2}O + energy\), hydrogen goes from an oxidation state of \(0\) (in \(H_{2}\)) to \(+ 1\) (in \(H_{2}O\)), so hydrogen is oxidized.
• In \(H_{2}O\), the oxygen atom has a higher electronegativity than the hydrogen atoms. The electrons in the \(O - H\) bonds are not shared equally. Oxygen pulls the electrons closer to itself, creating a dipole. So the \(O - H\) bonds in \(H_{2}O\) are polar covalent bonds.

Answer:

Hydrogen, polar.