Enthalpy change for a reaction is the same whether the change is brought about in one step or through various intermediate steps.
johnmulu answered the question on February 15, 2017 at 07:34
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What is the meaning of molar heat of combustion?
(Solved)
What is meant by molar heat of combustion?
Date posted:
February 15, 2017
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Write an ionic equation for the reaction that took place
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A beaker contained 75.0 cm3 of aqueous copper (II) sulphate at 23.7oC. When scrap iron metal was added to the solution, the temperature rose to 29.3oC.
Write an ionic equation for the reaction that took place
Date posted:
February 15, 2017
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What is the name given to each of the following:
(Solved)
What is the name given to each of the following:
a) Ability of a metal to be made into wire
b) Minimum energy required for a chemical reaction to start;
c) Type of force that holds atoms of neon together?
Date posted:
February 15, 2017
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State one disadvantage of using hydrogen fuel instead of fossil fuels
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State one disadvantage of using hydrogen fuel instead of fossil fuels.
Date posted:
February 15, 2017
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State and explain two reasons why hydrogen is a very attractive fuel compared to fossils
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State and explain two reasons why hydrogen is a very attractive fuel compared to fossils.
Date posted:
February 15, 2017
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What is meant by molar heat of solution?
(Solved)
What is meant by molar heat of solution?
Date posted:
February 15, 2017
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Define the standard enthalpy of formation of a substance
(Solved)
Define the standard enthalpy of formation of a substance
Date posted:
February 15, 2017
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State two factors that should be considered when choosing fuel for cooking
(Solved)
State two factors that should be considered when choosing fuel for cooking.
Date posted:
February 15, 2017
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Butane and propane are constituents of cooking gas. Which one produces more energy per mole on combustion?
(Solved)
Butane and propane are constituents of cooking gas. Which one produces more energy per mole on combustion? Explain.
Date posted:
February 15, 2017
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Answers (1)
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When pure water is heated at 1 atmospheric pressure at sea level, the temperature of the water does not rise beyond 100oC
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When pure water is heated at 1 atmospheric pressure at sea level, the temperature of the water does not rise beyond 100oC, even with continued heating. Explain this observation
Date posted:
February 15, 2017
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Distinguish between exothermic and endothermic reaction
(Solved)
Distinguish between exothermic and endothermic reaction.
Date posted:
February 15, 2017
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Explain why the enthalapy of neutralization of ethanoic acid with sodium hydroxide is different from that of hydrochloric acid with sodium hydroxide
(Solved)
Explain why the enthalapy of neutralization of ethanoic acid with sodium hydroxide is different from that of hydrochloric acid with sodium hydroxide.
Date posted:
February 15, 2017
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A compound whose general formula is M(OH)3 reacts as shown by the equation below
(Solved)
A compound whose general formula is M(OH)3 reacts as shown by the equation below.
M(OH)3(s) + OH$^-_4$(aq) $\rightarrow$ M(OH)$^-_4$(aq)
M(OH)3(s) + 3H+(aq) $\rightarrow$ M3+(aq) + 3H2O(l)
a) What name is given to compounds which behave like M(OH)3 in the two reactions
b) Name two elements whose hydroxides behave like that of M.
Date posted:
February 15, 2017
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When magnesium burns in air, it forms a white solid and a grey-green solid. When a few drops of water are added to the mixture, a gas that turns red litmus paper blue is evolved. Identify the:
(Solved)
When magnesium burns in air, it forms a white solid and a grey-green solid. When a few drops of water are added to the mixture, a gas that turns red litmus paper blue is evolved.
Identify the:
i) White solid
ii) Gas evolved and the gas
I) Name of gas
II) Use of the gas.
Date posted:
February 15, 2017
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Answers (1)
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Naturally occurring magnesium consists of three isotopes. 78.6%24Mg; 10%25Mg and 26Mg. Calculate to one decimal place, the relative atomic mass of magnesium
(Solved)
Naturally occurring magnesium consists of three isotopes. 78.6%24Mg; 10%25Mg and 26Mg. Calculate to one decimal place, the relative atomic mass of magnesium.
Date posted:
February 15, 2017
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Describe how sodium carbonate is used to remove water hardness.
(Solved)
Describe how sodium carbonate is used to remove water hardness.
Date posted:
February 15, 2017
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Dissolving of potassium nitrate in water is an endothermic process. Explain the effect of increase in temperature on the solubility of potassium nitrate
(Solved)
Dissolving of potassium nitrate in water is an endothermic process. Explain the effect of increase in temperature on the solubility of potassium nitrate.
Date posted:
February 15, 2017
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Answers (1)
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Starting with zinc sulphate solution, describe how a sample of zinc oxide can be obtained
(Solved)
Starting with zinc sulphate solution, describe how a sample of zinc oxide can be obtained.
Date posted:
February 15, 2017
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Aqueous hydrogen chloride reacts with potassium manganate (VII) to produce chlorine gas, while a solution of hydrogen chloride in methylbenzene has no effect on potassium manganate (VII)
(Solved)
Aqueous hydrogen chloride reacts with potassium manganate (VII) to produce chlorine gas, while a solution of hydrogen chloride in methylbenzene has no effect on potassium manganate (VII). Explain this observation.
Date posted:
February 15, 2017
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Answers (1)
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(a) Name two cations that are present in hard water (b) Explain how the ion exchange resin softens hard water
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a) Name two cations that are present in hard water.
b) Explain how the ion exchange resin softens hard water.
Date posted:
February 15, 2017
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Answers (1)