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Science experiment ---------------------------------- PowerPoint Presentation
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Science experiment ----------------------------------

Science experiment ----------------------------------

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Science experiment ----------------------------------

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  1. Science experiment---------------------------------- Bacteria growth in the various parts of the house

  2. The plan for the experiment • Materials : measuring instrument to an accuracy to of 0.1cm3 & can measure from 0.1 - 100cm3 at least, cotton swabs, Petri dish, thermometer • Materials to make Agar nutrients: agar powder 1.5g, Bovril 2g, sodium chloride 0.5g, water 10cm3 • Step 1: mix all the materials to make agar nutrients (agar powder 1.5g, Bovril 2g, sodium chloride 0.5g, water 10cm3) into a paste then slowly add water with stirring until the mixture reaches to 100cm3.

  3. The plan for the experiment • Step 2: Heat the mixture in a boiling water bath to 95 °C in the required container. • Step 3: pour the mixture evenly into six petri dishes evenly.

  4. Preparation pictures Heating the mixture to required temperature Mixing the materials together Nutrient agar in petri dishes Petri dishes put in ziploc and numbered

  5. Day 1 9/12 • No difference

  6. Day 2 10/12 • No difference

  7. Day 3 11/12 • Piano keys: nothing • Door knobs: nothing • Dining table: bacteria growth starts • Hand phone: nothing • Computer keyboard: nothing • TV button: nothing

  8. Day 3 pictures Petri dish no. 3 Overall pictures of petri dishes

  9. Day 4 12/12 • Piano keys: growth starts -1st • Door knobs: growth starts -3rd • Dining table: bacteria growth continues -2nd • Hand phone: nothing -6th • Computer keyboard: a bit of bacteria growth noticeable -4th or 5th • TV button: a bit of bacteria growth noticeable -4th or 5th

  10. Overall shot of the Petri dishes Day 4 pictures Petri dish 1 Petri dish 2 Petri dish 3 Petri dish 5 Petri dish 4 Petri dish 6

  11. Day 5 13/12 • Piano keys: most amount of bacteria growth -1st • Door knobs: 4th • Dining table: 2nd • Hand phone: growth starts -6th • Computer keyboard: 5th • TV button: 3rd

  12. Petri dish overall shot Day 5 pictures Petri dish 1 Petri dish 2 Petri dish 3 Petri dish 5 Petri dish 4 Petri dish 6

  13. Day 6 14/12 • Piano keys: most amount of bacteria growth -1st • Door knobs: least amount of bacteria growth noticeable -6th • Dining table: -3rd • Hand phone: -4th • Computer keyboard: -5th • TV button: -2nd

  14. Petri dish overall Day 6 pictures Petri dish 1 Petri dish 2 Petri dish 3 Petri dish 4 Petri dish 5 Petri dish 6

  15. Day 7 15/12 • Piano keys: most amount of bacteria growth -1st • Door knobs: -4th • Dining table: bacteria growth starts -5th • Hand phone: bacteria growth is the least -6th • Computer keyboard: -3rd • TV button: -2nd

  16. Day 7 pictures Petri dish 1 Petri dish 2 Petri dish 3 Petri dish 4 Petri dish 5 Petri dish 6

  17. ~the predicted results~ ~the results~ • 1st -Computer keyboard| 1st-The piano • 2nd - door knobs | 2nd - TV button • 3rd -hand phone | 3rd - computer keyboard • 4th - TV button | 4th - door knob • 5th - dining table | 5th - dining table • 6th - piano | 6th – hand phone

  18. Table with results tabulated Key: - means same