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Sample text

There are 6 places to the right (+6) from the decimal point in a to the original decimal point, so b = 6. 5 × 106. For a large number, the exponent of 10 (b) will be a positive integer equal to the number of decimal places to the right from the decimal point in a to the original decimal point. 0000000013, a small number: 1. 3, which is a real number between 1 and 10. 2. To find b, count the places to the left of the decimal point in a, finishing up at the original decimal point. There are 9 places from the left (–9) of the decimal point, so b = –9.

100 mol dm–3 NaCl solution? 8. 0 mol dm-3 solution? 9. 00 mol dm–3 Na2CO3 solution. Calculate the final concentration of Na+ ions in solution. Titration Calculations Titration is a technique which involves measuring the volume of one solution which just reacts completely with another solution. Usually one of the solutions will have an accurately known concentration and this will be used to find the concentration of the other solution. The solution of accurately known concentration is called a standard solution.

1 State the position of protons, neutrons and electrons in the atom. 2 State the relative mass and relative charge of protons, electrons and neutrons. 3 Defi ne the terms mass number (A), atomic number (Z) and isotopes of an element. 4 Deduce the symbol for an isotope given its mass number and atomic number. 5 Calculate the number of protons, neutrons and electrons in atoms and ions from the mass number, atomic number and charge. 6 Compare the properties of the isotopes of an element. 7 Discuss the use of radioisotopes © IBO 2007 I n 1807 John Dalton proposed his atomic theory - that all matter was made up of a small number of different kinds of atoms, that were indivisible and indestructible, but which could combine in small whole numbers to form compounds.

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