(a)
Interpretation:
Solubility of calcium has to be predicted and explained.
Concept introduction:
From the periodic table, one can find out the type of bonding present in substances by knowing whether the compound is made of metals or nonmetals or both. Metallic bonding is present between atoms of metals.
Answer to Problem 10E
Calcium, Ca is a metal. It will not dissolve in water.
Explanation of Solution
Calcium has metallic bonding with valence electrons free to move throughout the substance. There is a strong force of attraction between the positively charged atoms and negatively charged sea of electrons. So calcium atoms cannot dissolve in water.
(b)
Interpretation:
Solubility of NaNO3has to be predicted and explained.
Concept introduction:
Ionic compounds are formed between metals and nonmetals. These compounds have ionic bonds in them. NaNO3is an ionic compound as it has sodium metal and nitrogen and oxygen nonmetals.
Answer to Problem 10E
Sodium nitrate, NaNO3 is an ionic compound so it will dissolve in water.
Explanation of Solution
Sodium nitrate has ionic bonding between sodium ions and nitrate ions. In water, these ions dissociate and so the compound dissolves in water.
(c)
Interpretation:
Solubility of silicon has to be predicted and explained.
Concept introduction:
In network covalent bonding the charge cannot move as the electrons are stuck between the atoms and are not available to move.
(c)
Answer to Problem 10E
Silicon, Si is a nonmetal. It has network covalent bonding so it is not soluble in water.
Explanation of Solution
Silicon has network covalent bonding so it will settle down in water. It will not dissolve in water as the electrons are not free to move.
(d)
Interpretation:
Solubility of CH4has to be predicted and explained.
Concept introduction:
Methane is a gas with molecular covalent bonding. This bond allows atoms to share valence electrons between them.
(d)
Answer to Problem 10E
Methane, CH4 has molecular covalent bonding so it is soluble in water.
Explanation of Solution
Methane is a gas made of nonmetals carbon and hydrogen. It has molecular covalent bonding due to which the atoms share valence electrons between them. The molecules of methane scatter amongst the molecules of water and so they are soluble in water.
(e)
Interpretation:
Solubility of CuSO4has to be predicted and explained.
Concept introduction:
Ionic compounds are formed between metals and nonmetals. These compounds have ionic bonds in them. NaNO3is an ionic compound as it has sodium metal and nitrogen and oxygen nonmetals.
(e)
Answer to Problem 10E
Copper sulfate, CuSO4 is an ionic compound so it is soluble in water.
Explanation of Solution
Copper sulfate has ionic bonding between copper ions and sulfate ions. In water, these ions dissociate and so the compound dissolves in water.
Chapter U1 Solutions
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