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Submitted By hafsahsiregar
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Assessment Task 2: Laboratory Experiment and Report

Bacteria are one of the many culprits that cause disease and even death. Surface cleaner are sold to help disinfect and eliminate bacteria. Some of the common surface cleaners used are alcohol, tea tree oil and water. ‘Alcohols are effective disinfectants as they evaporate quickly, leaving no residue. They are capable of dissolving lipids, which makes them effective against lipid-wrapped viral cells such as HIV and hepatitis’ (healthE n.d.). Tea tree oil have been an effective disinfectant for many years used as a treatment for bacterial and fungal infections of the skin and nails (American Cancer Society 2008).
Micro-organisms such as bacteria and fungi can be found in a variety of places. Using petri dishes containing nutrient agar, bacteria and fungi can be grown and observed. ‘Agar is a seaweed extract that forms a jelly-like material that is also a source of food for these organisms. Bacteria grow into colonies made up of millions of individuals.’ Fungi can be seen as fuzzy growth on the agar plates (Leslie et al. 2000).
Objective/ Aim
Comparing three different surface cleaners in order to prevent bacterial growth.
70% ethanol is the most effective surface cleaner compared to homemade cleaner and water. Materials * Normal laboratory glassware and equipment * Nutrient agar filled petri dishes * Gloves * Sterile swabs * Masking tape * Marking pen * Incubators to refrigerate and store agar plates * Distilled water * 70% ethanol * Homemade cleaner (water, apple cider vinegar and tea tree oil.) * Water

Procedure Week 2 (27 August 2013)
Take four petri dishes and draw a line in middle to the three of them. Leaving one for the control. Label group’s name and treatment with its control. The surface that our group have decided to…...

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