chemical bonding summative test science 9.pptx

summative test in covalent and ionic bonding

1. A. Multiple Choice Choose the letter of the correct answer. Which of the following best describes an ionic bond? A. Sharing of electrons C. Overlapping of orbitals B. Transfer of electrons D. Attraction between molecules A covalent bond is formed when atoms… A. Transfer protons C. Lose neutrons B. Share electrons D. Gain neutrons Sodium chloride (NaCl) is an example of a/an: A. Ionic compound C. Metallic compound B. Covalent compound D. Polar molecule Which of the following elements is most likely to form an ionic bond with chlorine? A. Oxygen C. Sodium B. Nitrogen D. Carbon Water (H ₂ O) has what type of bond? A. Ionic C. Polar covalent B. Metallic D. Nonpolar covalent

2. What happens to metals in an ionic bond? A. They gain electrons C. They lose electrons B. They share electrons D. They break apart What happens to nonmetals in an ionic bond? A. They gain electrons C. They form metallic bonds B. They lose electrons D. They remain neutral Which compound has covalent bonding? A. NaCl C. KBr B. HCl D. MgO Which property is typical of ionic compounds? A. Low melting point C. High melting point B. Poor conductor when molten D. Usually gases at room temperature Which property is typical of covalent compounds? A. Conducts electricity when dissolved B. High melting point C. Usually forms crystals D. Usually gases or liquids at room temperature What is the charge of a sodium ion when it forms

3. B. True or False Ionic bonds involve the transfer of electrons. Covalent bonds involve the sharing of protons. Metals tend to lose electrons in ionic bonding. Nonmetals tend to lose electrons in ionic bonding. H ₂ O is a covalent compound. Ionic compounds conduct electricity when melted or dissolved in water. Covalent compounds have low melting and boiling points. NaCl is a covalent compound.

4. C. Identification Write the answer in the blank. The type of bond where electrons are transferred The type of bond where electrons are shared Compound formed when a metal and a nonmetal bond Compound formed when two nonmetals bond Positive ion formed in ionic bonding Negative ion formed in ionic bonding Bond in table salt Bond in carbon dioxide Rule that states atoms become stable with 8 valence electrons Smallest unit of a covalent compound