Ethene may be converted into poly(ethene). What type of reaction is this?
You have carried out a first-hand investigation to compare the reactivity of an alkene with its corresponding alkane.
(a) State the name of the alkene.
(b) Outline a procedure to compare the reactivity of this alkene with its corresponding alkane.
(c) Describe the results obtained from this first-hand investigation and include relevant chemical equations.
Explain why alkanes and their corresponding alkenes have similar physical properties, but very different chemical properties.
Which polymer is made by the polymerisation of methyl methacrylate?
The flowchart shows the production of polyethylene.
Describe Process Y.
A sample of polyethylene was produced by Process Y. The following graph shows the distribution of molecular weights of polymer molecules in the sample.
Why is a range of molecular weights observed?
Write a balanced chemical equation for the complete combustion of ethanol. 2003:22(a)
25.0 mL of 0.12 mol L−1 standard barium hydroxide solution was titrated with nitric acid. The results are recorded in the table.
Volume of nitric acid used
(a) Write a balanced chemical equation for the reaction of barium hydroxide with nitric acid.
The structures of two commercially significant monomers are shown.
(a) Identify the common name of ONE of the monomers
(b) The uses of polymers are dependent on their properties.
Discuss this statement with reference to a polymer made from one of the above monomers.
(c) Draw the structure of a polymer made from one of the above monomers.
During your practical work you performed a first-hand investigation to distinguish between an alkene and the corresponding alkane.
Name the alkene used in your investigation.
Identify a potential hazard in your investigation, and outline how you addressed this hazard.
Outline the procedure you used for your first-hand investigation. 2005:16(c)
Write a balanced equation for the incomplete combustion of methane.
An antacid tablet is known to contain calcium carbonate (CaCO3). To determine the mass of calcium carbonate in the tablet, the following procedure was used.
• The tablet was crushed and then placed in a beaker.
• A pipette was used to add 25.0 mL of 0.600 mol L–1 hydrochloric acid to the crushed tablet in the beaker.
• Once the reaction between the calcium carbonate and hydrochloric acid had stopped, phenolphthalein indicator was added to the reaction mixture. • A teflon-coated burette was then used to add 0.100 mol L–1 sodium hydroxide to the beaker to neutralise the excess hydrochloric acid.
• The phenolphthalein changed from colourless to pink after 14.2 mL of the sodium hydroxide solution had been added.
Write a balanced chemical equation for the reaction that occurred between the
1 calcium carbonate in the tablet and the hydrochloric acid.
Which is the main industrial source of ethylene?
A student was asked to perform a first-hand investigation to measure the difference in potential of various combinations of metals in an electrolyte solution. The student was provided with three metals: aluminium, zinc and silver; and three electrolyte solutions: aluminium nitrate, zinc nitrate and silver nitrate.
Identify which combination of the metals...
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