1. To determine the formula of a metal oxide by combustion, magnesium is heated in a crucible. Why is a lid used?

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2. Write the electronic configuration of argon

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3. State the mass and charge of a neutron

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4. Calculate the relative formula mass(Mr) of carbon dioxide (CO₂)

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5. In terms of mass and atomic number, what are isotopes?

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6. A sample of bromine contained the two isotopes in the following proportions: bromine-79 = 50.7% and bromine-81 = 49.3%. Calculate the relative atomic mass of bromine

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7. Work out the empirical formula of an oxide of chlorine contains 7.1 g of chlorine and 1.6 g of oxygen.

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8. A compound that contained 24.24% Carbon. 4.04% Hydrogen and 71.72% Chlorine and has a relative molecular mass of 99. Calculate the empirical formula and the molecular formula.

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9. What is meant by the term molecular formula?

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