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How do I calculate the percentage by mass of a metal within an impure substance?

For this question we will look at Sodium Sulphite (Na 2 SO 3 ) and its titration against Potassium Permanganate (KMnO 4 ). This requires acidic conditions. In this example we need to know several things: Tha...
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What is the basis of an NMR spectrum?

Nuclear Magnetic Resonance (NMR) is a spectroscopic technique used to detect certain nuclei in a molecule. 1 H and 13 C are the most commonly identified nuclei , however nuclei with an odd mass number can ex...
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Answered by Joanna T. Chemistry tutor
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Describe and explain the trend in reactivity down the alkali metals group.

Reactivity increases down the group. This is because the outer electron in each atom is further away from the nucleus as you go down the group and so the electrostatic forces between the nucleus and the oute...
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Answered by Ahmad T. Chemistry tutor
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(Chemistry A-level) What is a dative covalent bond?

A dative covalent bond, or coordinate bond, is a bond where there is 1 pair of shared electrons between two atoms. The difference relative to a covalent bond is that in a dative covalent bond these electrons...
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Answered by Oliver B. Chemistry tutor
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What is the trend in first ionisation energy across a period?

Overall, the general trend is an increase across the period. The decrease in shielding (as outer electrons are less influenced by the nucleus) is outweighed by an increased nuclear charge and a decreased ato...
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Answered by Ben W. Chemistry tutor
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