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Topic C2: Elements, Compounds, and Mixtures
C2.3 Properties of Materials
C2.3.1 Properties of Ionic Compounds
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What type of particles are formed when electrons are transferred between metals and non-metals in ionic compounds?
Ions
Electrostatic attraction is the bonding mechanism in
ionic compounds
.
True
What does the coordination number in ionic compounds refer to?
Nearest-neighbor ions
Ionic compounds have high melting and boiling points due to strong electrostatic forces.
True
What type of energy is required to overcome the strong ionic bonds in ionic compounds?
Electrostatic energy
The coordination number in ionic compounds influences the packing efficiency of the
crystal structure
.
True
The crystal structure of ionic compounds is characterized by a regular, repeating arrangement of cations and
anions
The coordination number in an ionic compound directly influences its packing efficiency.
True
Two key factors affecting the melting and boiling points of ionic compounds are the charge and the
size
Higher ion charges in ionic compounds result in stronger ionic bonds and
higher
melting points.
True
How does the size of ions affect the melting and boiling points of ionic compounds?
Larger ions lower melting points
Which type of ionic compounds are generally highly soluble in water?
Small, highly charged ions
When are ionic compounds good conductors of electricity?
Molten or in aqueous solution
Ionic compounds in the solid state are generally poor
conductors
of electricity.
True
In an ionic compound, the metal becomes a cation by losing
electrons
What type of ion does a metal form in an ionic compound?
Cation
Ionic compounds are formed by the sharing of electrons between atoms.
False
An example of an ionic compound is
NaCl
Metals lose electrons to form cations in ionic compounds.
True
Larger ions in ionic compounds have weaker ionic bonds and lower melting
points
.
What is the melting point of NaCl in degrees Celsius?
801
Match the ion properties with their solubility in water:
Small, highly charged ions ↔️ Highly soluble
Large, low-charged ions ↔️ Poorly soluble
Which type of ions in ionic compounds are highly soluble in water?
Small, highly charged ions
Why are metallic compounds good conductors of electricity?
Delocalized electrons
Ionic compounds are formed by the transfer of electrons between metals and
non-metals
Match the type of compound with its bonding mechanism:
Ionic ↔️ Electrostatic attraction
Covalent ↔️ Electron sharing
The coordination number in ionic compounds influences the degree to which ions are closely
packed
Arrange the following factors affecting the melting point of ionic compounds in order of their effect, from strongest to weakest:
1️⃣ Charge of the ions
2️⃣ Size of the ions
The high melting and boiling points of ionic compounds are due to the strong ionic
bonds
What is meant by the term "packing efficiency" in the context of ionic compounds?
Degree ions are closely packed
What does the coordination number in an ionic compound's crystal structure refer to?
Nearest-neighbor ions
Why are the melting and boiling points of ionic compounds generally high compared to covalent compounds?
Strong electrostatic attractions
The solubility of ionic compounds in water depends on the strength of the ionic bonds and the
size
Polar water molecules can overcome the strong electrostatic attractions in
ionic
compounds with small, highly charged ions, making them soluble.
True
Covalent compounds are poor conductors of electricity because electrons are tightly bound between
atoms
What type of crystal structure do ionic compounds have?
Regular, repeating arrangement
Match the compound type with its bonding description:
Ionic ↔️ Electrostatic attraction
Covalent ↔️ Sharing of electrons
Metallic ↔️ Delocalized electrons
Which of the following is an example of an ionic compound?
NaCl
Oppositely charged ions in ionic compounds are held together by electrostatic
attractions
What is the name given to the force that holds ions together in ionic compounds?
Ionic bond
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