SCI9_U2.4

What type of bond is formed between a metal and a non-metal?

• Covalent bond
• Ionic bond
• Metallic bond
• Hydrogen bond

What is the name of the regular arrangement of ions in ionic compounds?

• Crystal
• Lattice
• Layer
• Network

Why do ionic compounds have high melting points?

• They contain metal atoms
• They have weak intermolecular forces
• They have strong electrostatic forces between ions
• They have giant covalent bonds

Which of the following substances has a giant covalent structure?

• Methane
• Water
• Silicon dioxide
• Oxygen

Why is graphite soft?

• It has a low melting point
• It has weak forces between layers
• It has metallic bonds
• It has strong ionic bonds

How many covalent bonds does each carbon atom form in diamond?

• Two
• Three
• Four
• Five

Which element is used in pencils due to its softness?

• Diamond
• Silicon
• Carbon (Graphite)
• Chlorine

What are the weak forces between simple covalent molecules called?

• Ionic forces
• Covalent bonds
• Intermolecular forces
• Electrostatic forces

What kind of structure does sodium chloride form?

• Simple molecule
• Layered structure
• Giant lattice
• Macromolecule

Why do covalent substances usually not conduct electricity?

• They contain metals
• They do not have free-moving electrons or ions
• They dissolve in water
• They have a high melting point