Table 2.1 shows the masses of some of the ions in a $$$1000 \mathrm{~cm}^{3}$$$ sample of river water. Table 2.1 River water can contain acids such as ethanoic acid and methylbutanoic acid. (i) Draw the displayed formula for ethanoic acid. (ii) Ethanoic acid reacts with sodium hydroxide. Complete the word equation for this reaction. Methylbutanoic acid has the molecular formula $$$\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}$$$. Complete Table 2.2 to calculate the relative molecular mass of $$$\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}$$$. relative molecular mass $$$=$$$ ..........................

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_m24_qp_32 Year：2024 Question No：2(e)(iii)

Answer:

Knowledge points:

11.1.1. Draw and interpret the displayed formula of a molecule to show all the atoms and all the bonds

11.1.2.1. alkanes

11.1.2.2. alkenes

11.1.2.3. alkenes

11.1.2.4. carboxylic acids

11.1.3. Identify a functional group as an atom or group of atoms that determine the chemical properties of a homologous series

11.1.4. State that a homologous series is a family of similar compounds with similar chemical properties due to the presence of the same functional group

11.1.5. State that a saturated compound has molecules in which all carbon–carbon bonds are single bonds

11.1.6. State that an unsaturated compound has molecules in which one or more carbon–carbon bonds are not single bonds

11.1.7. State that a structural formula is an unambiguous description of the way the atoms in a molecule are arranged

11.1.8. Define structural isomers as compounds with the same molecular formula, but different structural formulae

11.1.9.1. having the same functional group

11.1.9.2. having the same general formula

11.1.9.3. differing from one member to the next

11.1.9.4. displaying a trend in physical properties

11.1.9.5. sharing similar chemical properties

7.1.1.1. metals

7.1.1.2. bases

7.1.1.3. carbonates

7.1.10. Define a strong acid as an acid that is completely dissociated in aqueous solution and a weak acid as an acid that is partially dissociated in aqueous solution

7.1.11. State that hydrochloric acid is a strong acid, as shown by the symbol equation,

7.1.12. State that ethanoic acid is a weak acid, as shown by the symbol equation

7.1.2.1. litmus

7.1.2.2. thymolphthalein

7.1.2.3. methyl orange

7.1.3. State that bases are oxides or hydroxides of metals and that alkalis are soluble bases

7.1.4.1. acids

7.1.4.2. ammonium salts

7.1.5.1. litmus

7.1.5.2. thymolphthalein

7.1.5.3. methyl orange

7.1.6. State that aqueous solutions of acids contain

7.1.7. Describe how to compare hydrogen ion concentration, neutrality, relative acidity and relative alkalinity in terms of colour and pH using universal indicator paper

7.1.8. Describe the neutralisation reaction between an acid and an alkali to produce water

Answer:

Knowledge points:

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