a)
Name the six changes of state, and state which changes are accompanied by a decrease in particle separation distances.
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b)
State the difference between a homogeneous and a heterogeneous mixture.
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c)
Classify the following mixtures as homogeneous or heterogeneous : crude oil, concrete and brass.
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d)
Which technique would be the most suitable for the separation of crude oil?
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a)
A compound with Mr =104.07 contains 34.62 % carbon, 3.88 % hydrogen and 61.50 % oxygen by mass.
Calculate its empirical formula.
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b)
Calculate the molecular formula of the compound in part a).
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c)
Draw a possible structure for the compound in part b).
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d)
Deduce the empirical formula of the following molecule:
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c)
Determine the molecular formula of the compound in part b), given the Mr = 90.09.
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a)
State the meaning of the term empirical formula.
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An unknown compound contains carbon, hydrogen and oxygen only. It was shown to contain 3.20 g carbon, 0.54 g hydrogen and 4.26 g oxygen.
b)
Calculate the empirical formula of the unknown compound.
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