Experiment 4 - Properties of ethanol

Why is the pH of distilled water acidic?

• test tube contain impurities

• absorption of atmospheric carbon dioxide into the distilled water

• Distilled water is naturally acidic

Ethanol dissolves in water because it forms ______ bonds with water molecules.

• dative

• hydrogen

• metallic

• covalent

Select the correct structure of triiodomethane.

• 
• 
• 
• 

Gas bubbles produced when sodium is placed into ethanol because sodium displace ______ from ethanol.

• oxygen

• nitrogen

• carbon

• hydrogen

Why is sodium metal kept in paraffin oil?

• To reduce the contact of sodium metal with vapour in the air

• To prevent the sodium metal from decomposing

• To keep the sodium metal fresh

• To maintain the glossiness of sodium metal

Name the white precipitate shown in the picture.

• Ethanoic acid

• Ethyl ethanoate

• Sodium ethoxide

• Sodium chloride

State the role of concentrated sulphuric acid, H₂SO₄ in esterification.

• Oxidising agent

• Reducing agent

• Precipitating agent

• Catalyst

Name the ester formed between propanol and glacial ethanoic acid.

• Ethyl propane

• Ethyl propanoate

• Propyl ethanoate

• Propyl ethane

Why does effervescence occurs when the product in part D is poured into a beaker containing sodium carbonate solution?

• Ester react with sodium carbonate solution to produce oxygen gas.

• Excess glacial ethanoic acid react with sodium carbonate solution to give off carbon dioxide gas.

• Hydrogen gas is released due to the reaction between ethanol and sodium carbonate solution.

Brown colour of bromine water _____ when it is added to ethanol.

• decolourises

• remains

• fades