Cracking the SAT Chemistry Subject Test

positive two to balance out the two hydroxide anions. Thus, the name of the first compound is iron (II) hy ...

Two examples: Draw the Lewis diagram for PF 3. 1) P + F(3) 5 + 7(3) = 26 valence e− 2) 3) 4) 5) 26 assigne ...

Draw the Lewis diagram for CO 2. 1) C + O(2) 4 + 6(2) = 16 valence e− 2) O C O 3) O—C— ...

The Nonpolar Covalent Bond When two nonmetals share electrons equally, they are said to be ...

electrons equally. But sometimes in a covalent bond, one atom tends to hog the electrons. It still sha ...

Covalent nomenclature is significantly less complicated than ionic nomenclature. When naming binary c ...

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Single, Double, and Triple Bonds So far, we’ve considered covalent bonds in which one pair of electrons ...

As you might expect, a triple bond such as the one that’s present in hydrogen cyanide (HCN) is represented by ...

release 103 kJ. (A positive ∆H indicates a net absorbance of energy.) ...

MOLECULAR SHAPES Some questions on the SAT Chemistry Subject Test might ask you about the shapes of molecules ...

Focus on the central carbon atom. It has four sites at which it is surrounded by electron pairs. How can t ...

A slightly different situation arises in a molecule of ammonia, NH 3 . Ammonia’s structural formula is as ...

In ammonia, there are four distinct electron pair sites around the central atom of nitrogen. Three o ...

The molecular shape you see is not exactly a tetrahedron; it’s more of a pyramid. This molecular geomet ...

Water has four electron pair sites around the central oxygen atom. However, two of them are lone pair ...

When boron acts as the central atom in a molecule, the shape is generally trigonal planar. S ...

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* assuming atoms of the same element surround the central atom Molecules Can Also Be Polar or Nonpolar We ...

The individual polarities from each C–H bond cancel each other out, making CH 4 nonpolar. Also note ...