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OCR A-level Chemistry Organic acids

Organic acids

This page covers the following topics:

Amino acids are organic compounds, containing Carbon, Oxygen, Hydrogen, Nitrogen and a variable side chain group, here represented by 'R'. A chain of amino acids connected by peptide bonds forms a protein.

Amino acids

Esters are compounds formed by a condensation reaction between a carboxylic acid and an alcohol, known as esterification. The functional group of an ester is (-COO), known as an ester link.

Ester formation

A dicarboxylic acid contains two -COOH functional groups. They are used in the production of copolymers.

Dicarboxylic acids

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Which of the compounds is NOT a carboxylic acid?

OCR A-level Chemistry Organic acids Which of the compounds is NOT a carboxylic acid?
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2

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Estimate the pH range of carboxylic acids.

OCR A-level Chemistry Organic acids Estimate the pH range of carboxylic acids.
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3

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Which of the following boxes is circling the 'R' group in the amino acid?

OCR A-level Chemistry Organic acids Which of the following boxes is circling the 'R' group in the amino acid?
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4

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Give the IUPAC name of the amino acid pictured, Valine.

OCR A-level Chemistry Organic acids Give the IUPAC name of the amino acid pictured, Valine.
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5

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What is the name of the bonds between amino acids in protein chains?

OCR A-level Chemistry Organic acids What is the name of the bonds between amino acids in protein chains?
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6

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What is the by-product of a esterification?

OCR A-level Chemistry Organic acids What is the by-product of a esterification?
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7

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What is the name of the ester in the image?

OCR A-level Chemistry Organic acids What is the name of the ester in the image?
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8

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Complete the equation: acetic acid + ammonia --> .

OCR A-level Chemistry Organic acids Complete the equation: acetic acid + ammonia --> .
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9

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Draw a diagram showing the formation of a polyester from a dicarboxylic acid and a diol.

OCR A-level Chemistry Organic acids Draw a diagram showing the formation of a polyester from a dicarboxylic acid and a diol.
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10

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Is it true or false that generally, dicarboxylic acids display similar chemical behaviour to monocarboxylic acids?

OCR A-level Chemistry Organic acids Is it true or false that generally, dicarboxylic acids display similar chemical behaviour to monocarboxylic acids?
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