11. Group 17
A section of Chemistry, 9701
Listing 10 of 617 questions
Carbon and silicon are elements in Group14. C60 and diamond are allotropes of carbon. Describe the lattice structure of solid C60. C60 sublimes (turns directly from solid to gas) at about 800 K. Diamond also sublimes but only above 3800 K. Explain why C60 and diamond sublime at such different temperatures. C60 forms hydrocarbons with similar chemical properties to those of alkenes. One such hydrocarbon is C60H18. State what is meant by the term hydrocarbon. Describe a test to indicate the presence of double bonds between carbon atoms in C60H18. Give the result of the test. test result  0.144 g of C60 was placed in a 100 cm3 container of hydrogen gas at 20 °C and 1.00×105Pa. The container was heated to make the C60 and hydrogen gas react. The reaction occurred as shown in the equation. C60+ xH2C60H2xAfter the reaction, the container was allowed to cool to 20 °C. The pressure decreased to 2.21×104 Pa. All of the C60 had reacted. Name the type of reaction that occurred. Calculate the amount, in moles, of C60 that reacted.  amount of C60 = mol Calculate the amount, in moles, of hydrogen gas that reacted with the C60.  amount of hydrogen gas = mol Use your answers from and to deduce the molecular formula of the hydrocarbon, C60H2x. If you were unable to calculate the amount of hydrogen gas, assume that 0.00240 mol of hydrogen gas reacted. This is not the correct value for the amount of hydrogen gas that reacted.  molecular formula = Silicon shows the same kind of bonding and structure as diamond. State the type of bonding and structure shown by silicon. When silicon reacts with magnesium, Mg2Si forms. Mg2Si is thought to contain the Si4– ion. State the full electronic configuration of the Si4– ion. 1s2 Solid Mg2Si reacts with dilute hydrochloricacid to form gaseous SiH4 and a solution of magnesiumchloride. Write an equation to show the reaction of solid Mg2Si with dilute hydrochloricacid. Include state symbols. Predict the shape of the SiH4 molecule. SiH4 reacts spontaneously with oxygen to produce a white solid and a colourless liquid that turns anhydrous copper(sulfate blue. No other products are formed. Write an equation for the reaction of SiH4 with oxygen. State symbols are not required. 
9701_m18_qp_22
THEORY
2018
Paper 2, Variant 2
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