Question

compounds
match each term on the left with the best descriptor on the right. each descriptor may be used only once.
1.______molecule
2.______ionic lattice
3.______polyatomic ion
4.______ionic compound
5.______covalent compound
a. pure substance made of one type of atom
b. atoms combine by gaining or losing electrons
c. repeating pattern of positive and negative ions
d. atoms combine by sharing electrons to form molecules
e. neutral particle that is made up of atoms that are joined together by covalent bonds
f. ion made up of two or more atoms that are held together with covalent bonds

Explanation:

1. A molecule is a neutral particle formed by atoms joined via covalent bonds, so matches E.
2. An ionic lattice has a repeating pattern of positive and negative ions, so matches C.
3. A polyatomic ion is an ion with two or more atoms bonded covalently, so matches F.
4. Ionic compounds form when atoms gain/lose electrons (ionic bonding), and the lattice is the structure, but the compound's formation is via B (atoms combine by gaining/losing electrons) and the lattice is C, but for the ionic compound term, the bonding type is B? Wait, no: ionic compounds are held in a lattice (C is lattice structure), but the formation of ionic compounds is when atoms transfer electrons (B). Wait, let's re - check:

• Ionic compound: Atoms combine by gaining or losing electrons (ionic bonding) to form ions, which then arrange in a lattice. So the descriptor for ionic compound is B? Wait, no, the ionic lattice is C. Wait, the term is "ionic compound"—the bonding in ionic compounds is atoms gaining or losing electrons (B), and the structure is the lattice (C). But the options: the ionic compound's key is the bonding (atoms combine by gaining or losing electrons) so B? Wait, no, let's list each:
• 1. Molecule: E (neutral, covalent bonds, made of atoms joined covalently)
• 2. Ionic lattice: C (repeating pattern of positive and negative ions)
• 3. Polyatomic ion: F (ion with two or more atoms, covalent bonds)
• 4. Ionic compound: B (atoms combine by gaining or losing electrons—this is ionic bonding, which forms ionic compounds)
• 5. Covalent compound: D (atoms share electrons to form molecules)

Wait, also, A is "pure substance made of one type of atom"—that's an element, not related here. So:

• 1. Molecule: E (neutral, covalent bonds, atoms joined covalently)
• 2. Ionic lattice: C (repeating pattern of positive and negative ions)
• 3. Polyatomic ion: F (ion with multiple atoms, covalent bonds)
• 4. Ionic compound: B (atoms combine by gaining or losing electrons—ionic bonding)
• 5. Covalent compound: D (atoms share electrons to form molecules)

Answer:

1. E
2. C
3. F
4. B
5. D