QUIZ #2

Select the answer that shows the words in the correct order to complete the sentence. The octet rule states that atoms tend to form bonds so that each atom has eight _________ in its __________ shell.

• protons; core

• electrons; valence

• neutrons; inner

• electrons; middle

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following Lewis structures correctly represent CaCl₂?

• Option A

• Option B

• Option C

• Option D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

• Covalent bonds are comprised of metal atoms that share at least some of their valence electrons.

• Covalent bonds hold the atoms together in discrete molecules.

• Covalent bonds form when atoms of nonmetals are close enough to each other for their orbitals to overlap.

• Covalent bonds can be single, double, or triple bonds.

• Covalent bonds hold ionic compounds together.

Tags

NGSS.HS-PS1-1

Chemistry students are learning about Lewis structures. Their instructor asks them to draw Lewis structures for carbon dioxide using both electron dots and bonds to show bonding relationships. Which of the following Lewis structures are correct? Select all that apply.

• I

• II

• III

• IV

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Organic chemists identified four different liquids of varying volatilities that they want to test further. They want to compare the overall volatility and intermolecular forces of these liquids.

For closed beaker, the circles indicate the amount of liquid volatility. A beaker with a large number of circles would have more liquid volatility than a beaker with only a few circles.

Which option correctly ranks the liquids in the order of increasing intermolecular forces?

• IV<III<II<I

• I<III<II<IV

• II<III<I<IV

• III<II<I<IV

The name of the formula PbCl₄ is

• lead(II) chloride
• lead(IV) chloride
• lead(III) chloride
• lead(I) chloride

Which of the following statements are supported by the data?

• All of the compounds exist in the solid state at 25°C.

• The compounds in which bromine bonds with a metal have higher melting points than the compounds in which bromine bonds with a nonmetal.

• The melting point of CBr₄ suggests that it can be classified as an ionic compound.

Use the table to answer the question. Calculate the electronegativity difference and determine the type of bond that NaCl forms. Pure covalent bonds have an electronegativity difference that is less than 0.4, polar covalent bonds have an electronegativity difference that is between 0.4 and 1.8, and ionic bonds have an electronegativity difference that is greater than 1.8. Calculate the electronegative value of NaCl.

• 3.9 polar

• 2.1 polar

• 2.1 nonpolar

• 3.9 nonpolar

• None of the above

Tags

NGSS.HS-PS1-2

phosphorus trichloride

• KCl₃
• PCl₃
• K₃Cl
• P₃Cl

The chemical formula of dinitrogen tetroxide is

• Ni₂O₄

• NiO

• N₂O₄

• NiO₂