Charge densities of metal ions decreases down the group. The attraction between the metal ions and the water molecules reduces as a result of reduction of charge densities down the group. The amount of energy released as a result of formation of one mole of aqueous ions from gaseous ions is reduced, which is the basis of hydration enthalpy.
Javan001 answered the question on December 11, 2020 at 18:45
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How does the volume of a fixed mass of gas vary with temperature at a constant pressure?
(Solved)
How does the volume of a fixed mass of gas vary with temperature at a constant pressure?
Date posted:
July 24, 2020
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Answers (1)
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How does the change in volume of a fixed mass of glass affects its pressure if the temperature is kept constant
(Solved)
How does the change in volume of a fixed mass of glass affects its pressure if the temperature is kept constant.
Date posted:
July 24, 2020
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Answers (1)
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What are functional groups?
(Solved)
The question requires one to explain the meaning of functional groups
Date posted:
June 5, 2020
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Answers (1)
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State and explain the changes in mass that occur when the following substances are separately heated in open crucibles. (ì) copper metal. (ii) copper(ii)nitrate.
(Solved)
State and explain the changes in mass that occur when the following substances are separately heated in open crucibles.
(ì) copper metal.
(ii) copper(ii)nitrate.
Date posted:
April 2, 2020
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Answers (1)
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A solution of ammonia in water is an electrolyte, whereas the same solution in methyl benzene is a non-elecrolyte . Explain.
(Solved)
A solution of ammonia in water is an electrolyte, whereas the same solution in methyl benzene is a non-elecrolyte . Explain.
Date posted:
April 2, 2020
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Answers (1)
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Explain how a MSAU is used to eliminate shortcomings of ring topology in an IBM token ring.
(Solved)
Explain how a MSAU is used to eliminate shortcomings of ring topology in an IBM token ring.
Date posted:
November 14, 2019
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Answers (1)
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An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 60.15 and 70.15. Calculate the relative...
(Solved)
An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 60.15 and 70.15. Calculate the relative abundance of each of the isotopes
Date posted:
November 14, 2019
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Answers (1)
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Use an energy cycle diagram to calculate the enthalpy of formation of ethane, given;
(Solved)
Use an energy cycle diagram to calculate the enthalpy of formation of ethane, given;
Date posted:
November 14, 2019
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Answers (1)
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In the equation below, identify the substance that acts as a base in the backward reaction. Explain your answer.
(Solved)
In the equation below, identify the substance that acts as a base in the backward reaction. Explain your answer.
Date posted:
November 14, 2019
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Answers (1)
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State any two factors which affect the rate of chemical reaction.
(Solved)
State any two factors which affect the rate of chemical reaction.
Date posted:
November 14, 2019
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Answers (1)
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What is meant by ‘rate of reaction?
(Solved)
What is meant by ‘rate of reaction?
Date posted:
November 14, 2019
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Answers (1)
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20.0 cm3 of a solution containing 2.7g/dm3 of an alkali XOH completely reacted with 25.0 cm3 of 0.045M sulphuric (VI) acid. Calculate the relative atomic...
(Solved)
20.0 cm3 of a solution containing 2.7g/dm3 of an alkali XOH completely reacted with 25.0 cm3 of 0.045M sulphuric (VI) acid. Calculate the relative atomic mass of X. (O=16, H=1)
Date posted:
November 14, 2019
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Answers (1)
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Sulphur (IV) oxide gas was bubbled through acidified potassium dichromate (VI) solution. Acidified barium nitrate solution was then added to the mixture. Explain the observations...
(Solved)
Sulphur (IV) oxide gas was bubbled through acidified potassium dichromate (VI) solution. Acidified barium nitrate solution was then added to the mixture. Explain the observations made.
Date posted:
November 14, 2019
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Answers (1)
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Use the information in the table to answer the questions that follow.
(Solved)
Use the information in the table to answer the questions that follow.
A mixture containing 34g of CuSO4 and 70g of AgNO3 in 100g of water at 70oC was cooled to 30oC.
a. Which salt crystallized out?
b.Calculate the mass of the crystals formed.
Date posted:
November 14, 2019
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Answers (1)
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Substance A and B reacted to form a gaseous product AB3 as shown in the following equation below.
(Solved)
Substance A and B reacted to form a gaseous product AB3 as shown in the following equation below.
The figure below shows how the percentage of gas AB3 in the equilibrium mixture changes with temperature.
(a) Explain how the percentage of AB3 gas changes as shown in the figure.
(b) On the axes below, sketch a graph showing how percentage of AB3 gas at equilibrium with the mixture changes with pressure.
Date posted:
November 14, 2019
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Answers (1)
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In an experiment, a mixture of 126.0 cm3 nitrogen and 120.0 cm3 hydrogen gases was heated in the presence of iron catalyst. Determine the composition...
(Solved)
In an experiment, a mixture of 126.0 cm3 nitrogen and 120.0 cm3 hydrogen gases was heated in the presence of iron catalyst. Determine the composition of the resultant gaseous mixture.
Date posted:
November 14, 2019
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Answers (1)
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A polymer has the following structure;
(Solved)
A polymer has the following structure;
Give the name of the monomer for the polymer above, and draw its structure.
Date posted:
November 14, 2019
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Answers (1)
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Give the systematic names of the following:
(Solved)
Give the systematic names of the following:
Date posted:
November 14, 2019
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Answers (1)
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What mass of copper would be deposited from a solution of copper (II) chloride when a current of 3.0A is passed through the copper (II)...
(Solved)
What mass of copper would be deposited from a solution of copper (II) chloride when a current of 3.0A is passed through the copper (II) chloride solution during electrolysis for 50 minutes? (Cu = 63.5, Faraday’s constant= 96,500 Coulombs)
Date posted:
November 13, 2019
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Answers (1)
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In a class experiment, 5.0g of ethanol were completely burnt and all the heat evolved was used to heat 500cm3 of water from 20o to...
(Solved)
In a class experiment, 5.0g of ethanol were completely burnt and all the heat evolved was used to heat 500cm3 of water from 20o to 80oC. (Given that the specific heat capacity of water = 4.18Jg-1oC-1, density of water = 1.0gcm-3, C = 12, O = 16, H = 1.0)
i. Write a balanced equation to show the reaction that takes place when ethanol burns.
ii. Calculate the heat energy:
I. Absorbed by the water
II. Given out when one mole of ethanol was burned completely.
Date posted:
November 13, 2019
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Answers (1)