By Roger Owen, Sue King
This e-book is aimed toward scholars taking the GCSE Double technology award and at lecturers who will locate it precious as a convenient reference and planner. the 1st 3 sections of the publication contain a precis of 'Materials and their houses' for key level three of the.
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Extra resources for Chemistry at a glance
4. What do the terms finite and non-renewable mean? 5. Name two gases which cause acid rain. OIL AND HYDROCARBONS Fractional distillation Fractional distillation is a physical process which can be used to separate mixtures of liquids which have different boiling points. • Oil, petrol, paraffin, and diesel do not mix with water but tend to float on top. • Liquids which do not mix are described as immiscible. • Separating immiscible liquids is fairly easy. Immiscible liquids do not mix. Miscible liquids do mix.
1 → K+ 2 . 8 . 8 Ar 2 . 8 . 8 Cl 2 . 8 . 7 • • • • • → Cl– 2 . 8 . 8 potassium ion argon atom Only outer electrons are involved in chemical reactions. chloride ion Atoms form ions by reacting with other atoms according to certain rules. Atoms will gain or lose enough electrons to achieve a stable outer energy level. The charge on an ion indicates the number of electrons gained or lost. Metals usually lose electrons to form positive ions (cations). Non-metals usually gain electrons to form negative ions (anions).
What is slate used for and why? 5. Granite can be used for kerbstones. Why is sandstone not suitable? 6. What are ores? 7. Name two ores and state which metals are extracted from them. 51 METAL ORES AND ROCKS Reduction and methods of extraction Metals are extracted from their ores by a process of reduction. This involves reducing the metal from its combined state back to the uncombined element. • The figures below show the composition of the Earth’s crust. • Rocks do not contain these elements but compounds of these elements.
Chemistry at a glance by Roger Owen, Sue King