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(a)
Interpretation:
The solids that has higher melting point from the pair NaCl or CsCl needs to be determined.
Concept introduction:
Solids have tendency to maintain their structure because in solids intermolecular force of attraction is higher than liquids and gases. They have a fixed shape thus solids are rigid.
Answer to Problem 113A
NaCl have higher melting point than CsCl.
Explanation of Solution
Na and Cs are group 1 elements. They can form +1 cation. Atomic size increases on moving down a group. In ions, as the size decreases intermolecular forces which hold the solid together increases. Atomic size of sodium is lower than caesium. Thus NaCl has higher melting point than CsCl.
(b)
Interpretation:
The solids that has higher melting point from the pair Ag or Cu needs to be determined.
Concept introduction:
Solids have tendency to maintain their structure because in solids intermolecular force of attraction is higher than liquids and gases. They have a fixed shape thus solids are rigid.
(b)
Answer to Problem 113A
Cu have higher melting point than Ag.
Explanation of Solution
Ag and Cu are group 11 elements. Both elements are a good conductor of electricity. Atomic size increases on moving down a group. In ions, as the size decreases intermolecular forces which hold the solid together increases. Atomic size of copper (Cu) is lower than silver (Ag). Thus, Cu has a higher melting point than Ag.
(c)
Interpretation:
The solids that has higher melting point from the pair Na2O or MgO needs to be determined.
Concept introduction:
Solids have tendency to maintain their structure because in solids intermolecular force of attraction is higher than liquids and gases. They have a fixed shape thus solids are rigid.
(c)
Answer to Problem 113A
MgO has higher melting point than Na2O .
Explanation of Solution
Between charged species strength of intermolecular attraction is depends on the charge of the ions. +ve and –ve ions have a stronger attraction. Na can form +1 cation and Mg can form +2 cation. In MgO, magnesium (Mg) carries +2 charge and in Na2O sodium carries +1 charge. Thus MgO has a higher melting point than Na2O .
Chapter 7 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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