Acids and Bases

A modern definition of an acid is:

• An electron donor

• A proton donor

• A sour tasting substance

• A substance that gives rise to a Hydronium ion in water

A modern definition of a base is:

• An electron acceptor

• A proton acceptor

• A substance with a bitter taste

• A substance that gives rise to a hydroxide ion in water

H⁺ can be identified as

• Proton or Hydrogen Ion

• Proton or Hydronium Ion

• Hydrogen Ion or Neutron

• Hydronium Ion or Neutron

Choose the INCORRECT description of an ACID

• Sour Taste

• Corrosive

• Reacts with metals to create Chlorine gas

• Is red/orange in a Universal Indicator

Choose the CORRECT description of a BASE

• Red/Orange on the Universal Indicator Chart

• pH less that 7

• Bitter taste

• Dry to the touch

Svente Arrhenius suggested that acids ...

• Would donate a proton

• Give rise to a hydronium ion in water

• Should never be eaten

• Are all poisonous

When placed in water, acids

• Precipitate out, leaving a solid

• Produce hydrogen gas

• Conduct electricity

• Change to a dark red colour

Ionisation is:

• the formation of ions from a reaction between two covalent compounds

• the formation of ions from a reaction between two ionic compounds

• the process of dissolving ionic substances

• the process of shooting ionic radiation at a substance

Identify the balanced equation which describes the self-ionisation of water

• 2H₂O --> 2H₂ + O₂

• H₂O --> H₂ + O₂

• 2H₂O --> 2H₃O⁺ + OH

• 2H₂O --> H₃O⁺ + OH^-

What duo described the modern definition of and acid and base at the same time?

• Paul Simon & Art Garfunkel

• Dawn French & Jennifer Saunders

• James Watson & Francis Crick

• Johannes Brønsted & Thomas Lowry