Question 1

Which of the following statements best describes the trend of electronegativity across the periodic table?

Accepted Answer

Electronegativity increases from left to right across a period and decreases down a group.

Question 2

Given the electronegativity values: $$\mathrm{Cl} = 3.0$$, $$\mathrm{K} = 0.8$$, what type of bond forms between chlorine and potassium?

Accepted Answer

Ionic

Question 3

Which molecule below contains a nonpolar covalent bond?

Accepted Answer

$$\mathrm{Cl}_2$$

Question 4

A bond between $$\mathrm{O} ($$electronegativity $$= 3.5) $$and $$\mathrm{S} ($$electronegativity $$= 2.5) is $$classified as:

Accepted Answer

Polar covalent

Question 5

Which of the following best explains why fluorine is the most electronegative element?

Accepted Answer

It is a nonmetal located at the top right of the periodic table.

Question 6

A bond with an electronegativity difference of $$1.0 is $$most likely:

Accepted Answer

Polar covalent

Question 7

Which of the following pairs of atoms will form the most polar covalent bond?

Accepted Answer

$$\mathrm{N}$$ and $$\mathrm{O}$$

Question 8

If the electronegativity difference between two atoms is $$2.0$$, what additional information is needed to determine if the bond is ionic or polar covalent?

Accepted Answer

Whether the atoms are metals or nonmetals

Question 9

Which of the following best describes a dipole in a polar covalent bond?

Accepted Answer

A separation of charge with a positive and negative end, indicated by $$\delta^+$$ and $$\delta^-.$$

Question 10

Which bond is expected to have the greatest ionic character?

Accepted Answer

$$\mathrm{Cl}-\mathrm{K}$$

Question 11

A patient is exposed to a compound containing $$\mathrm{NaCl}. $$Based on the electronegativity difference between $$\mathrm{Na}$$ ($$0.9) $$and $$\mathrm{Cl}$$ ($$3.0$$), what type of bond is present?

Accepted Answer

Ionic

Question 12

Which of the following molecules will have a dipole moment?

Accepted Answer

$$\mathrm{CO}$$

Question 13

A chemist mixes $$\mathrm{H}_2$$ and $$\mathrm{Cl}_2$$ gases. Which product will have a polar covalent bond?

Accepted Answer

$$\mathrm{HCl}$$

Question 14

Which of the following is NOT a correct statement about electronegativity?

Accepted Answer

Electronegativity is highest for metals.

Question 15

A bond between $$\mathrm{C}$$ ($$2.5) $$and $$\mathrm{O}$$ ($$3.5) $$has an electronegativity difference of $$1.0. $$What type of bond is this?

Accepted Answer

Polar covalent

Question 16

Which of the following best describes the electron distribution in a nonpolar covalent bond?

Accepted Answer

Electrons are shared equally or almost equally between atoms.

Question 17

A student claims that a bond with an electronegativity difference of $$0.3 is $$polar covalent. Is this correct?

Accepted Answer

No, because the difference is too small; it is nonpolar covalent.

Question 18

Which of the following bonds would be expected to have the smallest dipole moment?

Accepted Answer

$$\mathrm{N}-\mathrm{N}$$

Question 19

A scientist is designing a drug molecule and wants to include a region with high polarity. Which bond should they incorporate?

Accepted Answer

$$\mathrm{O}-\mathrm{Cl}$$

Question 20

Which of the following is a correct application of electronegativity difference to predict bond type?

Accepted Answer

A bond with a difference of $$2.2$$ between a metal and a nonmetal is ionic.

Electronegativity and Bond Polarity: Types of Chemical Bonds

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