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Model Answer – AS 2.4 Melting points. Question: Discuss the relative melting points of sodium oxide (Na 2 O), silicon dioxide (SiO 2 ), and sulfur dioxide (SO 2 ). 1. Overview – types of bonding. Na 2 O (metal and non-metal) is an IONIC SOLID. SiO 2 (silica) is a COVALENT NETWORK SOLID.

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Model answer as 2 4 melting points
Model Answer – AS 2.4 Melting points

  • Question: Discuss the relative melting points of sodium oxide (Na2O), silicon dioxide (SiO2), and sulfur dioxide (SO2)


1 overview types of bonding
1. Overview – types of bonding

  • Na2O (metal and non-metal) is an IONIC SOLID

  • SiO2 (silica) is a COVALENT NETWORK SOLID

  • SO2 (non-metals) is a COVALENT MOLECULAR SOLID


2 rank the melting points
2. Rank the melting points

  • Na2O → ionic solid → HIGH MPT

  • SiO2 → covalent network solid → HIGH MPT

  • SO2 → covalent molecular solid → LOW MPT

  • In general, network is the highest so SiO2> Na2O > SO2


3. Discuss each substance in terms of STRUCTURE, and relate the structure to the PROPERTY (in this case mpt, but could be solubility or conductivity)


Na 2 o
Na the structure to the PROPERTY (in this case mpt, but could be solubility or conductivity)2O

STRUCTURE

  • Sodium oxide is an ionic solid. It consists of positive and negative IONS in a 3D lattice structure. The ions are held together by STRONG ionic bonds. These bonds require a lot of energy to disrupt therefore sodium oxide has a HIGH MPT

BONDING

Related to

PROPERTY


Sio 2
SiO the structure to the PROPERTY (in this case mpt, but could be solubility or conductivity)2

STRUCTURE

  • Silicon dioxide is a covalent network solid. It consists of silicon and oxygen ATOMS in an extended network, all atoms bonded by STRONG COVALENT BONDS. These bonds require a lot of energy to disrupt therefore silicon dioxide has a HIGH MPT

BONDING

Related to

PROPERTY


SO the structure to the PROPERTY (in this case mpt, but could be solubility or conductivity)2

STRUCTURE

  • Sulfur dioxide is a covalent molecular solid. Although sulfur and oxygen ATOMS are covalently bonded making SO2 MOLECULES, the MOLECULES are bonded to other molecules by WEAK INTERMOLECULAR FORCES. These weak forces require little energy to disrupt therefore sulfur dioxide has a LOW MPT

BONDING

Related to

PROPERTY


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