Covalent Bonds and Molecular Shapes

What do Lewis structures use to represent covalent bonds and unbonded valence electrons?

• Curved lines and circles

• Straight lines and dots

• Dashed lines and squares

• Wavy lines and triangles

What does VSEPR theory help explain about molecules?

• Their color

• Their taste

• Their 3D shapes

• Their weight

In orbital hybridization, if you mix one s orbital and two p orbitals, how many hybrid orbitals are produced?

• One

• Two

• Three

• Four

What is the molecular shape of methane (CH4) and what type of bonds are formed between carbon and hydrogen?

• Linear, pi bonds

• Trigonal planar, double bonds

• Tetrahedral, sigma bonds

• Bent, lone pairs

How many sigma and pi bonds are present in a triple bond between two carbon atoms?

• One sigma, one pi

• One sigma, two pi

• Two sigma, one pi

• Two sigma, two pi

What is the molecular shape of a water molecule?

• Linear

• Trigonal planar

• Bent

• Tetrahedral

Which of the following are the three main components of DNA?

• Proteins, lipids, and carbohydrates

• Five-carbon sugars, phosphate groups, and nitrogenous bases

• Amino acids, fatty acids, and glucose

• Water, salt, and carbon dioxide

What defines molecules as isomers?

• They have different molecular formulas but the same arrangement of atoms.

• They have the same molecular formula but different arrangements of atoms.

• They have the same number of protons but different numbers of neutrons.

• They have different numbers of electrons but the same number of protons.