Chemical Bonding and Tests Quiz

Sodium fluoride (NaF) is a compound where sodium donates an electron to fluorine, creating a strong bond. Based on the ΔEN value, which is above 1.7, what type of bond is formed?

• Polar covalent bond

• Non-polar covalent bond

• Ionic bond

• Metallic bond

Carbon dioxide (CO₂) is a compound formed when carbon reacts with oxygen. In this molecule, carbon is double-bonded to each oxygen atom to satisfy the octet rule. Which of the following Lewis structures correctly represents this bonding?

• O=C=O

• O-C=O

• C=O=O

• O=C-C

The water (H₂O) molecule has two hydrogen atoms bonded to a central oxygen atom, with two lone pairs of electrons on the oxygen. According to VSEPR theory, what is the molecular geometry of water?

• Linear

• Bent

• Trigonal planar

• Tetrahedral

Ammonia (NH₃) is a compound with a nitrogen atom bonded to three hydrogen atoms. Nitrogen also has a lone pair of electrons, influencing the molecule's three-dimensional shape. According to VSEPR theory, what is the molecular geometry of ammonia?

• Linear

• Trigonal planar

• Trigonal pyramidal

• Tetrahedral

Boron trifluoride (BF₃) is a molecule where the central boron atom is bonded to three fluorine atoms. This molecule has no lone pairs on the boron atom. According to VSEPR theory, what is the molecular geometry of BF₃?

• Trigonal planar

• Trigonal pyramidal

• Tetrahedral

• Bent

Nitrogen (N₂) gas makes up most of the Earth's atmosphere and is essential for life. In a nitrogen molecule, the two nitrogen atoms are triple-bonded to achieve stability. Which Lewis structure correctly represents a nitrogen molecule?

• N≡N

• N=N

• N-N

• N≡O

Phosphorus trichloride (PCl₃) has a central phosphorus atom bonded to three chlorine atoms. In the Lewis structure of PCl₃, how many lone pairs of electrons are present on the phosphorus atom?

• 0

• 1

• 2

• 3

In a molecule of carbon tetrafluoride (CF₄), the central carbon atom is bonded to four fluorine atoms. According to VSEPR theory, what is the molecular geometry of CF₄?

• Trigonal planar

• Tetrahedral

• Linear

• Bent

The central atom in sulfur dioxide (SO₂) is sulfur, which is bonded to two oxygen atoms and has one lone pair of electrons. According to VSEPR theory, what is the molecular geometry of SO₂?

• Linear

• Bent

• Trigonal planar

• Tetrahedral

A student performs the iodine test on two solutions: one containing starch and another containing glucose. What is the expected observation for the solution containing starch?

• The solution turns blue-black.

• The solution remains colorless.

• The solution forms a reddish-orange precipitate.

• The solution turns yellow.