This video tutorial covers the amphoteric behavior of alumina, a key topic in BTEC Applied Science Unit 5 Chemistry. It begins with definitions of acids, bases, and alkalis, explaining their properties and differences. The video then focuses on alumina, discussing its chemical formula, inert nature, and reactions with acids and bases. It highlights alumina's amphoteric properties, allowing it to act as both an acid and a base. The tutorial concludes with practical applications of alumina, such as in fillers, paints, and chromatography.

What is the main focus of this chemistry lesson?

• Chemical bonding

• The periodic table

• Organic chemistry

• The amphoteric behavior of alumina

Which of the following is a diprotic acid?

• H2SO4

• HCl

• NaOH

• CH3COOH

What distinguishes an alkali from a base?

• Alkalis are always solid

• Alkalis dissolve in water to form hydroxide ions

• Alkalis are acidic

• Alkalis do not react with acids

What is the unique property of amphoteric substances?

• They only react with water

• They are non-reactive

• They can act as both an acid and a base

• They are always acidic

What is the chemical formula for alumina?

• Al2O3

• AlO

• Al3O2

• AlO2

How does alumina react with hydrochloric acid?

• It does not react

• It forms aluminum hydroxide

• It forms aluminum chloride and water

• It forms water

What is a desiccant?

• A substance that adds moisture

• A drying agent that removes water

• A type of acid

• A chemical that reacts with bases

In which industry is alumina used as a filler?

• Automobile

• Food

• Paint

• Textile

What role does alumina play in chromatography?

• It is a catalyst

• It is a reactant

• It is used as a thin layer for separation

• It acts as a solvent

Why is alumina considered chemically inert?

• It is unreactive under normal conditions

• It is highly reactive

• It reacts with all substances

• It only reacts with water