Chemistry - 2sec - chapter3 - lesson 1

Which of the following statements about chemical bonding is false?

• 1. In covalent bonding, electrons are shared between atoms.

• 2. Molecular compounds can only contain covalent or ionic bonding, never both.

• 3. In ionic bonding, electrons are transferred between atoms, forming ions.

• 4. Chemical bonding involves electrostatic attractions between oppositely charged particles

Which of the following pairs of atoms are unlikely to form a covalent bond?

• 1. Neon and argon

• 2. Nitrogen and oxygen

• 3. Sulfur and chlorine

• 4. Carbon and fluorine

Which of the following is the correct Lewis structure for a fluoride ion?

• a

• b

• c

• d

The Lewis structure for a molecular compound of potassium and sulfur is shown below. How can you tell this compound is ionically bonded?

• 1. Ionic compounds always contain atoms in a 2 : 1 ratio.

• 2. The atoms are sharing electrons to obtain full outer shells but have not become ions.

• 3. The atoms have either lost or gained electrons to become ions and obtain full outer shells.

The Lewis structure for an atom of helium is shown below. Which of these statements explains why helium does not usually form chemical bonds?

• 1. The first electron shell can hold eight electrons, but finding six electrons for a full valence shell is too difficult.

• 2. The first electron shell can only hold two electrons; therefore, helium has a full valence shell.

• 3. Helium is a gas and therefore cannot lose its two electrons.

Which of the following is the correct Lewis structure for an atom of nitrogen?

• a

• b

• c

• d

• e

Which of the following pairs of atoms are unlikely to form an ionic compound?

• 1. Calcium and oxygen

• 2. Sodium and aluminum

• 3. Magnesium and chlorine

Which of the following is not a type of chemical bonding?

• 1. Metallic

• 2. ionic

• 3. nuclear

Which of the following types of structure is formed when anions and cations bond together?

• 1. Alternating layers of cations and anions

• 2. A lattice of alternating cations and anions

• 3. A lattice of neutral atoms

Listed in the table are a range of anions and cations commonly found in salts.

Which anion and cation in the table would attract each other most strongly?

• 1. As3- and Al 3+

• 2. O2- and Mg2+

• 3. Cl - and Li +