10 Questions
What type of bond holds the ions together in an ionic crystal?
Electrostatic
The characteristic that would best identify an ionic crystal is:
Conducts electricity when dissolved in water
At the lattice points of an ionic crystal are:
Ions
Ionic compounds conduct electricity in the solid state.
True
Ionic crystals easily cleave along a plane because of electrostatic repulsion.
True
Ionic crystals are usually liquids at room temperature.
False
The ______ barked.
dog
The following are properties of all metals except:
Are solids at room temperature
Which one of the following would have metallic bonds?
Na
Which of the following are properties of all metals and help determine it to be a metal?
Conduct electricity in the solid state
Study Notes
Ionic Crystals
- Ionic crystals are held together by electrostatic bonds between ions.
- They are characterized by high melting points, hardness, and brittleness.
- Ionic crystals do not conduct electricity in their solid state, but do conduct when dissolved in water.
Types of Crystalline Solids
- Ionic crystals: composed of positive and negative ions, held together by electrostatic bonds.
- Molecular crystals: composed of molecules, held together by intermolecular forces.
- Network covalent crystals: composed of atoms bonded covalently to neighboring atoms.
- Large carbon chain (LCC) crystals: composed of long chains of carbon atoms.
- Metallic crystals: composed of positive kernels surrounded by a sea of electrons.
Properties of Metals
- Conduct electricity in the solid state.
- Can be hammered into sheets.
- Shine when polished.
- Conduct heat.
- Are typically solids at room temperature.
Metallic Bonds
- Occur in metals, such as Na and Fe.
- Involve the delocalization of electrons.
Properties of Solids
- Ionic crystals: high melting points, hardness, and brittleness.
- Molecular crystals: low melting points, softness, and volatility.
- Network covalent crystals: high melting points, hardness, and brittleness.
- Metallic crystals: high melting points, conductivity, and ductility.
Classification of Substances
- BaCl2: ionic crystal.
- SiC: network covalent crystal.
- H2: molecular crystal.
- Ag: metallic crystal.
- C8H14: molecular crystal.
- C6H9OH: molecular crystal.
- SiO2: network covalent crystal.
- C7H16: molecular crystal.
- Al: metallic crystal.
- NaBr: ionic crystal.
- O2: molecular crystal.
Solubility and Conductivity
- Solubility in water: ionic crystals (e.g., NaCl) and polar molecules (e.g., HOH) are typically soluble.
- Solubility in benzene: nonpolar molecules (e.g., C7H16) are typically soluble.
- Conductivity in solid state: metallic crystals (e.g., Ag) and some ionic crystals (e.g., SiC) are conductors.
- Conductivity in water: ionic crystals (e.g., NaCl) and some polar molecules (e.g., HOH) are conductors.
Quiz on ionic crystals, covering bonding and characteristics of ionic crystals.
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