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Molar heat of vaporization Is the amount of heat energy required to convert one mole of a liquid substance at its boiling point to its gaseous state
johnmulu answered the question on January 17, 2017 at 05:27
- Explain why graphite can be used as a lubricant while diamond cannot(Solved)
Explain why graphite can be used as a lubricant while diamond cannot.
Date posted: January 16, 2017. Answers (1)
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Diamond and graphite are crystalline forms of cation. State two non crystalline (Amorphous) form of carbon.
Date posted: January 16, 2017. Answers (1)
- State two observations made when excess hydrogen suphide gas is bubbled into copper (II) sulphate solution(Solved)
State observations made when excess hydrogen suphide gas is bubbled into copper (II) sulphate solution.
Date posted: January 16, 2017. Answers (1)
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A student attempted to prepare hydrogen sulphide gas and collected the gas over cold water. The student collected only a few bubbles of gas. Explain.
Date posted: January 16, 2017. Answers (1)
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Starting with zinc oxide, describe how a pure sample of zinc sulphate can be prepared in the laboratory.
Date posted: January 16, 2017. Answers (1)
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A form three student added sodium carbonate solution to a solution of aluminium chloride in water. A white precipitate was formed. The precipitate soon dissolved liberation a colourless gas.
i) What is the white precipitate?
ii) Explain why the precipitate dissolves?
Date posted: January 16, 2017. Answers (1)
- Magnesium and silicon are both in period III of the periodic table(Solved)
Magnesium and silicon are both in period III of the periodic table. The atomic radius of the magnesium is found to be higher than silicon. Explain this observation.
Date posted: January 16, 2017. Answers (1)
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Nitrogen (II) oxide is produced in the internal combustion engines. State and explain how it affects the environment.
Date posted: January 16, 2017. Answers (1)
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Name a pair of suitable reagents that can be used to prepare nitrogen (II) oxide in the laboratory.
Date posted: January 16, 2017. Answers (1)
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State Graham's law.
Date posted: January 16, 2017. Answers (1)
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Name the two flames produced by a Bunsen burner and the conditions under which they are produced.
Date posted: January 16, 2017. Answers (1)
- State two factors that should be considered when choosing a fuel for cooking?(Solved)
What factors should be considered when choosing a fuel for cooking?
Date posted: January 14, 2017. Answers (1)