By Margaret Cross
Pupil Unit publications are ideal for revision. each one advisor is written by means of an examiner and explains the unit requisites, summarises the appropriate unit content material and contains a sequence of specimen questions and solutions.
Read Online or Download AQA AS Chemistry Student Unit Guide : Unit 1 Foundation Chemistry PDF
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Extra resources for AQA AS Chemistry Student Unit Guide : Unit 1 Foundation Chemistry
Explain the meaning of the term ‘isotope’. (c) The simpliﬁed mass spectrum of naturally occurring neon is shown below. 30% 20 21 22 m/z Assuming that all the peaks are produced by ions with a single positive charge, what is the relative atomic mass of neon? (d) Explain how the three isotopes of neon can be separated in a mass spectrometer by describing the various parts of the mass spectrometer and by discussing the principles of operation of each part. (e) Another element was analysed in the mass spectrometer and the following data were produced.
It also reacts with water and oxygen in the atmosphere to produce sulfuric acid and, hence, acid rain. Today, most of the sulfur is removed from petrol for use in motor vehicles and the sulfur dioxide produced by the combustion of petroleum fractions in power stations and factories is removed by passing the ‘flue gases’ through beds (or ‘scrubbers’) containing calcium oxide. This is a base that reacts with the sulfur dioxide to form a salt. Greenhouse gases and global warming Electromagnetic radiation from the sun is absorbed by the Earth’s surface and is reemitted into the atmosphere as infrared radiation.
You need to remember the trends, not the actual numbers. Important points about electronegativity include: ● Electronegativity increases across a period. ● Electronegativity decreases down a group. ● Fluorine is the most electronegative element in the periodic table. ● Small atoms with a large number of protons in the nucleus attract electron density more strongly. ● No values are quoted for the noble gases because these elements generally do not form compounds with covalent bonds. When a covalent bond exists between atoms of differing electronegativity, the shared pair of electrons is displaced towards the more electronegative atom.
AQA AS Chemistry Student Unit Guide : Unit 1 Foundation Chemistry by Margaret Cross