• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7

# 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

# Related International Baccalaureate Biology essays

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

Home brand and duck toilet cleaners both displayed the "intermediate" level with 12.6mm and 10mm in diameter respectively (A Olsen, pg 1, 1995). As expected the control of water did not show any inhibition (figure 3). Water does not affect bacterial cells because all bacteria posses an external capsule white

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

0.03ppm, 0.06ppm, 0.09ppm and 0.12ppm for the second investigation. And a mixture of 1ppm of DDT and 0.03ppm of Azo Dye for the third investigation. Next, 200ml from each measuring cylinder (DDT and the Azo-Dye) was poured into their respective beakers: (B, C, D and E). For the third investigation however 100ml from its measuring cylinder will be poured

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

Piping used Controlled variable Non toxic 0.8cm pvc tubing. Method of recording pulse Controlled variable Pulse will be recorded via a heart rate monitor for 1 minute with the beats per minute recorded. Start of heart rate monitor Controlled variable Heart rate is only read after 30 seconds of pipe

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

Table cont. Avoid residues inside the pot when filling it with soil A clean kitchen towel will be used to thoroughly wipe clean the inside of the pots before soil is placed inside it. Days for seeds to germinate When the plant emerges from the soil that is classified as germinating.

2. ## Lung Capacity Fitness Level

As a result, it enables the body efficiently and effectively gets oxygen into the blood stream. Regular exercise allows the body to store, transport and utilize oxygen more proficiently. Although the cardio-respiratory function is improved with exercising and increasing fitness level, it does not change the lung's ability to expand.

1. ## 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.

2. ## Penicillin - its discovery, properties and uses.

He also specifically studied the impact of Penicillium glaucum too. In 1874, he noticed that when penicillium glaucum is present, it did not allow the growth of some forms of bacteria. In 1875, an Irish physicist John Tyndall after reading John Burdon-Sanderson's research, he decided to follow up on his work.

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