ASSESSMENT-COVALENT COMPUND

What type of elements usually form covalent bonds?

• METAL

• METALLOIDS

• NONMETAL

• NOBLE GASES

What do atoms share in covalent bonding?

• PROTONS

• NEUTRONS

• ELECTRONS

• IONS

What is the main difference between ionic and covalent bonding?

• Covalent bonding transfers electrons

• Ionic bonding shares electrons

• Covalent bonding shares electrons, ionic bonding transfers them

• Both involve electron sharing

Which of the following is a nonpolar covalent compound?

• HCl

• HF

• H₂O

• O₂

What partial charges develop in a polar covalent bond due to unequal sharing of electrons?

• Full positive and negative charges

• No charge at all

• Slightly positive and slightly negative charges

• Only a negative charge

What causes a covalent bond to become polar?

• Equal sharing of electrons

• Different numbers of neutrons

• Unequal sharing of electrons due to different electronegativities

• Sharing of protons

Which of the following statements is TRUE about covalent compounds?

• conduct electricity in water

• have high melting and boiling points

• are formed between metals and non-metals

• can exist as gases, liquids, or solids

What is the Lewis structure used to represent?

• Atomic nuclei

• Energy levels

• Sharing of electrons

• Molecular orbitals

Which element forms a duplet instead of an octet in covalent bonding?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

Why is O₂ paramagnetic despite its Lewis structure showing all electrons paired?

• has a positive charge

• has unpaired protons

• Its true molecular orbital structure contains unpaired electrons

• Oxygen atoms are unstable