Quiz #1 Chemical Bonding

Which of the following chemical substances has a triple covalent bond?

• carbon dioxide (CO₂)

• oxygen (O₂)

• carbon monoxide (CO)

• water (H₂O)

Ethylene (C₂H₄) is a gaseous hydrocarbon which is used to synthesize different types of polymers. Which of the following diagrams represent the electron dot structure of ethylene?

• Option A

• Option B

• Option C

• Option D

Tags

NGSS.HS-PS1-2

If you wanted to change the polarity of hydrogen bromide (HBr) by substituting the bromine by a different atom. Which atom would increase the polarity of the molecule? (WHAT IS MORE POLAR THAN Br)

• chlorine (Cl)

• iodine (I)

• sulfur (S)

• hydrogen (H)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following bonds is classified as a polar bond? ( multiple answers)

• Br-Br

• Si-F

• K-Cl

• S-O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Nonpolar substances do not dissolve in polar solvents like water. If you’re conducting an investigation to test the solubility of different substances, which of these substances do you expect to be insoluble in water?

• ammonia (NH₃)

• hydrogen sulfide (H₂S)

• hydrogen fluoride (HF)

• silane (SiH₄)

Which of the following bulk properties of substances are affected by intermolecular forces? Select all that apply.

• ductility

• boiling point

• volatility

• malleability

• melting point

Which of the following statements about volatility are true? Select all that apply.

• Volatility is a measure of how easily a liquid evaporates.

• Volatility is a measure of how easily a liquid condenses.

• Volatile liquids have a large number of molecules in the gas phase above the liquid.

• Volatile liquids have a small number of molecules in the gas phase above the liquid.

• Stronger intermolecular forces result in higher volatility.

Tags

NGSS.HS-PS1-3

Which of the following options correctly ranks solid iodine, liquid bromine, and chlorine gas in the order of increasing intermolecular force strength?

• solid iodine < liquid bromine < chlorine gas

• solid iodine < chlorine gas < liquid bromine

• chlorine gas < liquid bromine < solid iodine

• liquid bromine < solid iodine < chlorine gas

Read the following passage and then answer the next two questions. Graduate students are conducting research on the intermolecular forces of various substances. As part of their research, they conducted two experiments in which they investigated various bulk characteristics of different substances. In their first experiment, they explored the boiling points of various liquids. In their second experiment, they investigated the melting points of different compounds. In their first experiment, the graduate students determined the boiling points of pentane, hexane, heptane, and octane. Which of the four molecular compounds has the weakest intermolecular forces?

• pentane

• hexane

• heptane

The graph shows that molecular substances tend to melt at _____ temperatures. This is because intermolecular attractions are _____ than ionic bonds. Look at the graph.

• moderate; equal
• lower; weaker
• lower; stronger

Tags

NGSS.HS-PS3-4