Chemical Bonding

Chunky Boards!!!!

Fill in the blanks:What occurs as two atoms of bromine combine to become a molecule of bromine?

Energy is _________ as a bond is ________.Energy is released as a bond is formed.

Given a formula for oxygen: O2

What is the total number of electrons shared between the atoms represented in this formula?

4

Which formulas represent two polar molecules?

A. CO2 and HCl

B. CO2 and CH4

C. H2O and HCl

D. H2O and CH4

Which formula represents a molecular compound?

A. Kr

B. LiOH

C. N2O4

D. NaI

Which substance is made up of molecules that are dipoles? Why?

H2O CH4

N2 CO2

Fill in the blanks:The bonds in BaO are best described as ________, because valence electrons are ________.

The bonds in BaO are best described as ionic,

because valence electrons are transferred.

Which formula represents a nonpolar molecule?A. CH4

B. HCl

C. H2O

D. NH3

The chemical bonding in sodium phosphate, Na3PO4, is classified as _________. Why?

A. ionic, only

B. metallic, only

C. both covalent and ionic(It contains a polyatomic ion)

D. both covalent and metallic

• Which element is composed of molecules that each contain a multiple covalent bond?

A. chlorine

B. fluorine

C. hydrogen

D. nitrogen

Which type of substance can conduct electricity in the liquid phase but not in the solid phase?

ionic compound

The relatively high boiling point of water is due to water having which IMF?

hydrogen bonding

Which of the following is a property of network solids, but not of molecular solids?

A. water solubleB. electrical insulatorsC. high malleabilityD. high melting points

What type of bond contains positive ions immersed in a sea of mobile electrons?

metallic bond

Which element has an atom with the greatest tendency to attract electrons in a chemical bond?

A. Carbon

B. Chlorine

C. Silicon

D. Sulfur

The nitrogen atoms in a molecule of N2 share a total of how many pairs of electrons?

3

Hydrogen bonding is a type of

A. strong covalent bond

B. weak ionic bond

C. strong intermolecular force

D. weak intermolecular force

What type of bond is formed by unequal sharing of valence electrons?

polar covalent bond

What type of bond is formed when the electronegativity difference between two atoms is greater than or equal to 1.7?

ionic bond

Helium may be liquefied at low temperature and high pressure primarily because of __________ ________ .

dispersion forces (or weak intermolecular forces).

Two categories of compounds are

(Hint: Think about the two types of bonds)

ionic and molecular

What type of bond is formed when the electronegativity difference between two atoms is greater than 0.4, but less than 1.7?

polar covalent bond

Which type of bond is found between atoms of solid cobalt?

metallic

Which is the best conductor of electricity?

A. NaCl (Sodium Chloride)

B. Cu (Copper)

C. H2O (Water)

D. Br2 (Bromine)

Fill in the blanks:

Nonmetals such as Cl combine with metals such as Na by _______ electrons to form ________ compounds.

gaining electrons to form ionic compounds

Fill in the Blank:When a chemical bond is broken,

energy is ________.

absorbed

Three examples of network solids are:

diamond, quartz and silica SiO2

Why Br2 is a liquid at STP and I2 is a solid at STP?

Molecules of I2 have stronger intermolecular forces than molecules of Br2.

An ionic bond can be formed when one or more electrons are ____________ .

transferred from the valence shell of one atom to the valence shell of another atom.

At standard pressure, CH4 boils at 112 K and H2O boils at 373 K. What accounts for the higher boiling point of H2O at standard pressure?

hydrogen bonding

Which Lewis electron-dot diagram represents a molecule having a nonpolar covalent bond?

Which Lewis electron-dot diagram represents a molecule having a polar covalent bond?

Which Lewis electron-dot diagram represents a molecule having an ionic bond?

What type of bond is formed by equal sharing of valence electrons?

nonpolar covalent bond