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What is empirical formula and how is it worked out?

Empirical formula is the simplest ratio of elements in a formula. chemists use it to make big molecules easier to work with when doing calculations. An example of a working out an empirical formula is; Q) He...
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Answered by Tom F. • Chemistry tutor
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You added 75cm^3 of 0.5moldm^-3 HCl to impure MgCO2, and some was left unreacted. The unreacted HCl reacted completely with 21.6cm^m of 0.5moldm^-3 NaOH. So what is the percentage purity of the MgCO3 sample?

MgCO 3 +2HCl --> MgCl 2 + H 2 O +CO 2 For this kind of question, I would always try to convert what I can into moles because that is the link between the solid (the grams of the MgCO 3 ) and the liquid (t...
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Answered by Febi S. • Chemistry tutor
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What is the difference between oxidation and reduction?

In chemistry if a substance is oxidised it loses electrons in a reaction. If a substance is reduced it gains electrons in a reaction. A reaction that has both oxidation and reduction within it is called a RE...
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Answered by Thomas C. • Chemistry tutor
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What is the effect of a catalyst in an equilibrium process?

A catalyst provides an alternative pathway for a reaction to take place and therefore helping the reaction to take place at a lower activation energy. In an equilibrium process, a catalyst has no effect on t...
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Answered by Rajenth N. • Chemistry tutor
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What are covalent bonds?

Covalent bonds are a type of chemical bond formed by a shared pair of electrons between atoms. Covalent bonds tend to occur between non-metal type atoms (metals tend to form ionic bonds which are formed by a...
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Answered by Aneesh S. • Chemistry tutor
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