BIOLOGY 1GROUP 10 :ACID RAIN MEMBERS: NOOR AZURAH ABDUL RAZAK (D20101037502) IRA NUSRAT JAAFAR (D20101037533) WAN NORAZWANI MAHUSIN (D20101037506)KESAVARTINII A/P BALA KRISNAIN (D20101039444)
FORMATION OF ACID RAIN Power stations, industries & vehicles release gases into the atmosphere Sulphur dioxide and nitrogen oxides Oxidation in clouds produces sulphuric acid and nitric acid. Acid polluted air blown by the wind Water droplets become polluted Wet deposition (acid rain)
WATER AS A UNIVERSAL SOLVENT Water is also a good solvent due to its polarity When an ionic or polar compound enters water, it is surrounded by water molecules ( hydration) The relatively small size of water molecules to surrounded one molecule of solute.
POLARITY AND HYDROGEN BONDING• An important feature of water is its polar nature• Oxygen,O2 has higher electronegativity than hydrogen,H2• The O2 end is partially negative and H2 end is partially positive• The changes differences case water molecules to be attracted to each other• This attraction contributes to hydrogen bonding
ACIDITY IN NATURE• pH of pure water is 7• Water exposed to air rapidly dissolve carbon dioxide, CO2 and form dilute solution of carbonic acid (pH 5.7)• When water droplets falls as raindrops through air, minor amount of CO2 absorbed- slightly acidic• Presence of nitrogen oxides and sulphur dioxide in air dissolve into cloud falls as raindrops which is acidic• pH of acid rain below 5.6
QUESTIONS…..1) What is the main gases produced by vehicles and industrials that can cause acid rain? a) carbon monoxide b) oxides of nitrogen c) methane d) sulphur trioxide
2) Which of the following is/are the forms of acid deposition? i. Wet deposition ii. Rain iii. Dry deposition iv. Cloud water dropletsa) I onlyb) I and IIIc) II and IVd) III and IV
3) All the following are the effects of acid rain,except……. a) damage plants b) erosion of the building c) sea level rises d) skin cancer