Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

(a) In the following boxes draw the structural formulae of three alcohols having straight (i.e. unbranched) chains, with the molecular formula $C_5H_{...

2009 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Sorbic acid is used as a food preservative because it kills fungi and moulds.[Image_1: Sorbic acid structural formula]Sorbic acid will react withhydro...

2009 Winter

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

The characteristic odour of rum is attributed to the compound 2-ethyl-3-methylbutanoic acid.\[ \begin{align*} &\text{H}_3\text{C} &&&&&\text{CH}_3 \ &...

2009 Winter

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

The acarid mite releases extit{lardolure} to attract other mites to a host. This chemical can be destroyed by hydrolysis with acid. \[ \text{CH}_3\t...

2009 Winter

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Which compound is a product of the hydrolysis of $CH_3CO_2C_3H_7$ by boiling aqueous sodium hydroxide?

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

When organic refuse decomposes in water carboxylic acids are formed. The water becomes acidic and aquatic life is destroyed.Which additives are suitab...

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Which compound is a product of the hydrolysis of $CH_3CO_2C_3H_7$ by boiling aqueous sodium hydroxide?

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

When organic refuse decomposes in water carboxylic acids are formed. The water becomes acidic and aquatic life is destroyed.Which additives are suitab...

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Propanoic acid occurs naturally as a result of the bacterial fermentation of milk, and is partly responsible for the flavour of Swiss cheese.Which sta...

2010 Summer

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Acyl chlorides are useful intermediates in organic syntheses.(a) (i) State a suitable reagent for converting carboxylic acids into acyl chlorides........

2010 Summer

Theory

CH4 - STATES OF MATTER

The rate of chemical reactions is affected by changes in temperature and pressure.(a) (i) Draw a curve on the axes to show the Boltzmann distribution ...

2021 Spring

Theory

CH11 - GROUP 17

Chlorine, $Cl_2$, is a reactive yellow-green gas. It is a strong oxidising agent.(a) State how $Cl_2$ is used in water purification......................

2021 Spring

Theory

CH5 - CHEMICAL ENERGETICS

Compounds P, Q and R have all been found in the atmosphere of one of Saturn’s moons. P: N≡C—C≡C—C≡C—N Q: H—C≡C—C≡N R: ![Cyclopr...

2021 Spring

Theory

CH3 - CHEMICAL BONDING

Hydroxyethanal, HOCH$_2$CHO, has been observed in dust clouds near the centre of our galaxy.hydroxyethanal(a) Predict the bond angles labelled x and y...

2021 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(a) The most common oxidation states of cobalt are +2 and +3.Complete the electronic configurations of the following free ions.• Co2+ [Ar] .........

2021 Spring

Theory

CH6 - ELECTROCHEMISTRY

(a) Iron(II) compounds are generally only stable in neutral, non-oxidising conditions.It is difficult to determine the lattice energy of FeO experimen...

2021 Spring

Theory

CH3 - CHEMICAL BONDING

Iodates are compounds that contain the $\text{IO}_3^{-}$ anion.(a) The $\text{IO}_3^{-}$ anion is shown.Explain, with reference to the qualitative mod...

2021 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

The transition elements are able to form stable complexes with a wide range of molecules and ions.(a) State the meaning of transition element............

2021 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(a) Carboplatin and satraplatin are used as anticancer drugs instead of cisplatin. (i) Describe the action of cisplatin as an anticancer drug. ........

2021 Spring

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Fumaric acid is a naturally occurring dicarboxylic acid.\\[ \text{fumuric acid} \] \[ \text{HO}_2\text{C}=\text{CH}-\text{CH}=\text{CO}_2\text{H} \](a...

2021 Spring