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Chemistry

Scottish Highers

Why does first ionisation energy decrease as you go down a Group in the Periodic Table?

There are two reasons: increasing atomic size and increasing shielding effect.
Increasing atomic size - As you go down the Group, the atom size becomes larger, therefore the electron that must be rem...

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What is a paramagnetic complex? Why is [Fe(H2O)6]2+ paramagnetic while [Fe(CN)6]2- is diamagnetic, despite both having octahedral Fe2+ centres?

A paramagnetic complex is any complex that has at least one unpaired electron.[Fe(H2O)6]2+ is paramagnetic since H2O is a weak field ligand, this means there is a small energy gap between the t2g and eg a...

Answered by Kieran B. • Chemistry tutor

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1. Parabens are esters of 4-hydroxybenzoic acid (structure), give example of a paraben & draw other compound used to make it. 2. Suggest a possible use for parabens. 3. What type of hybridisation does the aromatic carbon adopt? 4. How do pi bonds form?

Eg. methyl/ethyl/propyl (etc.) paraben. Drawing of the alcohol used to make paraben. Possible uses: food preservative, cosmetic, or pharmaceutical use. The aromatic carbon atoms are sp²hybridi...

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How do I explain that the breakdown of an ester is a hydrolysis reaction?

The breakdown of any product using water is called a hydrolysis reaction.
Ester + Water ---> Alcohol + Carboxylic acid
An ester splits into alcohol and carboxylic acid during its reaction wi...

Answered by Mamie U. • Chemistry tutor

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A student obtained 3.7g of methyl cinnamate (162g/mol) from 6.5g of cinnamic acid (148g/mol) and 2.0g of methanol (32g/mol). Determine which reagent is limiting and calculate the percentage yield achieved by the student.

Reaction equation:cinnamic acid + methanol --> methyl cinnamate (+ water).Determine the limiting reagent:Calculate the number of moles of each reagent using the triangle g/(GFM)*(n).n = g/GFM cinnamic ...

Answered by Libby M. • Chemistry tutor

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