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In an experiment a sample of boric acid was heated in a crucible at 170 °C. The results of this experiment are given in the table. € € Time of heating / minutes Mass of crucible and contents / g € 0 35.85 € 5 35.10 € 10 34.41 € 15 34.00 € 20 33.70 € 25 …
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Titration curves, labelled E F G and H, for combinations ...
drwainwright.weebly.comIn an experiment to determine the acid dissociation constant (Ka) of a weak acid, 25.0 cm3 of an approximately 0.1 mol dm–3 solution of this acid were titrated with a 0.10 mol dm–3 solution of sodium hydroxide. The pH was measured at intervals and recorded. The table below shows the results. € € Volume of NaOH / cm 3 0.0 1.0 2.0 3.0 4.0 ...
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drwainwright.weebly.com(b)€€€€ Outline a mechanism for the nucleophilic substitution reaction in which 2-bromopropane (CH3CHBrCH3) reacts with potassium hydroxide to form propan-2-ol. € € € € € (2) (c)€€€€ Haloalkanes also undergo elimination reactions to produce alkenes. (i)€€€€€ Outline a mechanism for the elimination reaction in ...
Alcohol A (CH3 2CHCH(OH)CH3 undergoes reactions ... - …
drwainwright.weebly.com(c) €€€€In the production of bioethanol, glucose (C6H12O6) is converted into a dilute aqueous solution of ethanol and carbon dioxide. Give the name of this process and state three essential conditions necessary to produce a good yield of ethanol.
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drwainwright.weebly.comA biocide is a chemical that kills bacteria. A biocide is added to prevent the growth of bacteria in the water used in vases of flowers. Household bleach contains aqueous chlorine and can be used as the biocide. The concentration of chlorine in vase water decreases with time. It was decided to investigate the rate of this decrease.
This question is about the elements in Period 3 of the ...
drwainwright.weebly.comInclude any lone pairs of electrons that influence the shape. Shape of ClF3 €€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€Shape of CCl2 (2) ... €€€€ State the type of structure shown by crystals of sulfur and phosphorus.
Consider the following reaction sequence starting from ...
drwainwright.weebly.com(c) €€€€The amine CH3CH2CH2NH2 can be prepared by two different routes. Route A is a two-stage process and starts from CH3CH2Br. Route B is a one-stage process and starts from CH3CH2CH2Br. (i)€€€€€€Identify the intermediate compound in Route A.
The reaction of bromine with ethane is similar to ... - Weebly
drwainwright.weebly.com(Total 11 marks) € € ... B€€€€€€€nucleophilic substitution C€€€€€€€elimination D€€€€€€€nucleophilic addition-elimination (Total 1 mark) 14 Page 14 of 35 €€€€€€€€€ (a)€€€€ Crude oil is separated into fractions by fractional distillation. Outline how different fractions
This question is about the elements in Period 3 ... - Weebly
drwainwright.weebly.com(a)€€€€Table 1 shows some data about fundamental particles in an atom. € Table 1 € Particle proton neutron electron € Mass / g 1.6725 × 10–24 1.6748 × 10–24 0.0009 × 10–24 (i)€€€€€€An atom of hydrogen can be represented as 1H Use data from Table 1 to calculate the mass of this hydrogen atom.
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