11.4. Alkanes
A subsection of Chemistry, 0620, through 11. Organic chemistry
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Ethane is an alkane. Draw the structure of ethane to show all of the atoms and all of the bonds.  Complete the chemical equation for the complete combustion of propane. C3H8 + 5O2 → CO2 + H2O Methane is an alkane which is produced by the fractional distillation of petroleum. State one other process which puts methane into the atmosphere. Give one major use of methane. Alkanes and alkenes are hydrocarbons. State the meaning of the term hydrocarbon. Alkanes and alkenes can be distinguished by a chemical test. Name the reagent that can be used to distinguish between alkanes and alkenes. Alkenes are manufactured by cracking alkanes. Name an element that is also produced by cracking alkanes. State one condition required for cracking alkanes. 
0620_w20_qp_32
THEORY
2020
Paper 3, Variant 2
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This question is about chlorine and compounds of chlorine. Chlorine is an element in GroupVII of the PeriodicTable. State the meaning of the term element. State one use of chlorine. Chlorine reacts with phosphorus to produce phosphorus(chloride. Balance the equation for this reaction. P + Cl 2 → 2PCl 5 This reaction is exothermic. State the meaning of the term exothermic. Chlorine reacts with aqueous sodiumbromide. Complete the word equation for this reaction. chlorine + sodium bromide +  Describe a test for bromide ions. test observations  When bromine is mixed with aqueous sodiumchloride there is no reaction. Suggest in terms of chemical reactivity why there is no reaction. A compound of chlorine has the formula C3H6Cl 2. Complete the table to calculate the relative molecular mass of C3H6Cl 2. atom number of atoms relative atomic mass carbon 3 × 12 = 36 hydrogen chlorine 35.5  relative molecular mass = 
0620_m22_qp_32
THEORY
2022
Paper 3, Variant 2
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