• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Biology experiment. Investigating the effect of temperature on the surface tension of water

Extracts from this document...

Introduction

BIOLOGY HIGHER LEVEL Internal Assessment Investigating the effect of temperature on the surface tension of water November 2010 Research Question Will increasing the temperature affect the surface tension of water? Hypothesis If the temperature of the water is increased, then it will reduce the capacity of the surface tension as increasing temperature increases the kinetic energy of the water molecules, causing them to move faster, thus having less cohesive forces and surface tension. Safety Figure I: Risk assessment of possible hazards Hazard Reason Precaution Hot water Water at higher temperatures can burn Handle hot water with care and avoid touching Hot plate At high temperatures the hot plate can burn Handle hot plate with care and avoid touching surface Variables Figure II: Independent, dependent and controlled variables in the experiment Type of Variable Variable Range of Values or Method of Control Independent Temperature of the water From 10.0oC to 50.0oC Dependent Number of drops coin can hold Taken from number of drops that coin holds before it overflows and breaks (excludes the drop that made it overflow) Controlled Temperature When a specific temperature is needed for the water and coin, it will be controlled by the water bath. ...read more.

Middle

(� 0.6oC) Trial Number of drops coin can hold (� 1 drop) 10.0 1 55 2 54 3 56 4 55 5 55 20.0 1 51 2 48 3 49 4 50 5 50 30.0 1 39 2 40 3 40 4 42 5 39 40.0 1 34 2 32 3 32 4 31 5 33 50.0 1 27 2 29 3 28 4 27 5 28 Figure IV: Qualitative data collected from experiment Temperature of water (oC) (� 0.6oC) Trial Qualitative observations 10.0 1 Shape: water approximately 70mm in height, quite angular at top edge 2 3 4 5 20.0 1 Shape: water approximately 65mm in height, quite angular at top edge 2 3 4 5 30.0 1 Shape: water approximately 58mm in height, slightly rounded at top edge 2 3 4 5 40.0 1 Shape: water approximately 48mm in height, rounded at top edge 2 3 4 5 50.0 1 Shape: water approximately 40mm in height, more flat than round at top edge 2 3 4 5 Data Processing Figure VI: Calculated values obtained from experiment Temperature of water (oC) (� 0.6oC) Average number of drops the coin could hold (2 sig. ...read more.

Conclusion

The result values were also quite similar. There was no great deviation and the results fell within acceptable differences. The advantage in this experiment was the counting of the droplets, which had clear distinctions. However, there were a few limitations in this experiment. There were possible sources of random error. One possible source of error was an inconsistent experimental technique. As this experiment requires precision of individual technique, especially with the dropping of droplets, this could possibly be the largest source of random error. However, this was minimised through the repeated trials. Temperature fluctuation is also another source of possible error. While the water bath and hot plate can control the temperature, the water in the pipette could fluctuate. But this can be reduced by quickly performing the experiment for each trial. Also, there were possible systematic errors in this experiment. If the equipment was calibrated incorrectly, it would affect the values. Further improvements could also be proposed for this experiment. A trial run for each temperature can be performed in order to gauge an approximation for the surface tension which would ensure that the first result does have a great difference between the others. More repeats, such as 10 trials, would be also beneficial to the nature of this experiment. ?? ?? ?? ?? Page 2 of 3 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Marked by a teacher

    Osmosis Internal Assessment (Biology)

    4 star(s)

    Percent change in mass and mean percent change in mass of potato strips Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Mean 1.0 0.00% 3.33% 3.33% 6.66% 0.00% 3.33% 2.0 6.66% 10.00% 10.00% 6.66% 3.33% 6.66% 3.0 13.33% 13.33% 20.00% 16.66% 13.33% 16.66% 4.0 16.66% 20.00% 16.66%

  2. Biology- Extended essay. For this research, I investigated the effects of DDT and ...

    The time of performing the experiment was kept controlled. All experiments and observations carried out started at 12 noon in order to attain an equal response from the fish. APPARATUS REQUIRED: * Glass beakers 12 � 200ml * Mrigal fishes � 60 * Fish tanks � 2 * Measuring

  1. Lung Capacity Fitness Level

    spirometer and it can be said that the air is 'collected' by the spirometer so therefore the value will be a positive number. Vital lung capacity = | negative value | + positive value Diagram 1.2: Pasco Spirometer and mouthpiece [5] As human beings are needed for this experiment, there

  2. Penicillin - its discovery, properties and uses.

    Glancing at it again, Fleming rescued the plate from the bath of disinfectant in which it was about to be immersed. Six years before, he had discovered a substance called lysozyme - a substance found in tears, mucus and saliva, which had shown a similar capacity to kill off bacteria.

  1. The effect of toliet cleaning products on E-coli ...

    -Keep container tightly closed. -In case of contact with eyes rinse with plenty of water and contact Doctor or Poisons Information Centre. R18 R36 R52 R67 S22 S24 S39 S51 S49 S40 S07 S26 Methylated spirits -Highly flammable. - Irritating to eyes.

  2. Allelopathy. Open Investigation Will increasing the number of allelopathic sunflower plants effect the ...

    Using a red permanent marker, label 5 pots - 0; 1; 2; 3; 4; respectively. This refers to how many sunflower seeds are planted inside the pot eg: There will be 5 pots labelled "0", 5 pots labelled "1", 5 pots labelled "2", 5 pots labelled "3" and 5 pots labelled "4" 4.

  1. The effect of pvc piping on the breathing/heart rates of male year 12 students

    for one minute and then recorded as beats per minute, this will be compared against the control of regular breathing. Breathing rate Dependent variable After being induced under pipe breathing for 30 seconds the subject's rate of breath (full inhalation vs.

  2. Body Temperature Experiment

    Let the water heat up until it begins to bubble. 5. Record the room temperature with a thermometer. 6. Using the tongs, take the beaker off the wire gauze and carefully pour water in the measuring cylinder. Fill the measuring cylinder up to 100ml.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work