Understanding Chemical Bonds

What is the primary reason atoms form bonds?

• To reduce their overall energy

• To increase their energy levels

• To create new elements

• To become more positive or negative

What happens to the energy of the system when two atoms form a bond?

• It decreases

• It increases

• It fluctuates unpredictably

• It remains constant

What type of bond is formed when electrons are shared evenly between atoms?

• Non-polar covalent bond

• Ionic bond

• Polar covalent bond

• Metallic bond

What determines the polarity of a molecule?

• The temperature at which the molecule exists

• The separation of charges within the molecule

• The phase of the molecule (solid, liquid, gas)

• The size of the molecule

What is the bond length of Cl2, chlorine gas?

• –239 kilojoules per mole

• 0.276 nanometers

• 0.00199 nanometers

• 2.31 × 10–19 joules per nanometer

What is electronegativity?

• The distance between two bonded atoms

• The ability of an atom to attract and hold electrons

• The energy required to break a chemical bond

• The charge of an electron

What kind of bond is formed between atoms with very similar electronegativities?

• Ionic bond

• Polar covalent bond

• Non-polar covalent bond

• Metallic bond

What is the significance of the bond length in a chemical bond?

• It is the distance at which the bond can break

• It represents the maximum energy of the bond

• It indicates the number of electrons shared in the bond

• It is the distance at which the energy of the system is minimized

What type of bond is characterized by the uneven sharing of electrons?

• Metallic bond

• Non-polar covalent bond

• Ionic bond

• Polar covalent bond

Which bond type involves the transfer of electrons from one atom to another?

• Metallic bond

• Ionic bond

• Hydrogen bond

• Covalent bond