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

Water Lab

Extracts from this document...

Introduction

Water Lab - Trial I Aim To investigation the property of surface tension of water. Problem Statement What is the effect of increasing the number of pennies added to a completely filled beaker of water on the surface tension of the water? Hypothesis Materials 25 mL graduated cylinder (Uncertainty � 0.5 mL) 50 mL beakers (Uncertainty � 1 mL) Ruler (Uncertainty � 0.5 mm) Thirty pennies Marble Water Variables Manipulated Variable The volume of pennies added to beaker of water. Responding Variable Whether the water in the beaker overflows (surface tension is lost). Controlled Variables Volume of water in the beaker (The 50 mL beaker will always be filled to the brim so that the water level will be 1 mm over the brim of the beaker). The temperature of the lab (The temperature was kept at a constant 25�C). The volume of one penny (This value will be determined in the experiment). How the variables were controlled. Manipulated Variable The pennies were added one at a time in order to manipulate this variable at a constant rate; increasing the pennies one at a time made it easier to determine exactly how many pennies it took for the beaker to overflow. Controlled Variables [Volume of water in the beaker] The beaker was filled 1 mm above the brim every time to keep the volume of water in the beaker constant, thus allowing for the same strength of surface tension. ...read more.

Middle

50mL, water level is 1mm above beaker's brim 14 3 Slightly over 50mL, water level is 1mm above beaker's brim 15 Results from displacement experiment Volumes of Water, Five Pennies and Water, and Five Pennies in a Graduated Cylinder Volume of water in graduated cylinder (�0.5mL) Volume of five pennies and water in graduated cylinder (�0.5mL) Volume of five pennies in graduated cylinder (�1.0mL) 10 mL 12 mL 2 mL Finding the volume of 5 pennies was calculated Volume of 5 Pennies = Volume of 5 Pennies and Water - Volume of Water = 12 mL (�0.5mL) - 10 mL (�0.5mL) = 2 mL (�1.0mL) Finding the volume of 1 penny To find the volume of 1 penny, divide the volume of 5 pennies by 5. Data Processing To find the volume of pennies required to make the beaker overflow, multiply the volume of one penny by the number of pennies required to make the beaker overflow. Sample Calculation - Trial Processing the data into a table Volume of Pennies Required Causing a Beaker Filled With a Specific Amount of Water to Overflow Trial Volume of water in beaker (�1 mL) Volume of pennies required to make the beaker overflow (�0.2mL) 1 Slightly over 50mL, water level is 1mm above beaker's brim 5.2 mL 2 Slightly over 50mL, water level is 1mm above beaker's brim 5.6 mL 3 Slightly over 50mL, water level is 1mm above beaker's brim 6.0 mL Average of the number of pennies required to make the ...read more.

Conclusion

Although the pins were of the same brand and material, it is not certain that each pin was exactly 0.03g. This uncertainty could result in a change in the overall calculation of the mass. Under time constraints, we could not weigh the pins before putting them on the surface of the water. However, if there was more time allowed, we would have weighed each pin to make sure that each pin is the right mass. Also, while putting the pins on the surface of the water, they tend to move towards the edge of the petri dish, making it harder for the pins to be placed onto the water. As a result of this, some pins were stacked on top of each other, which could result in a concentrated amount of mass in one area of the petri dish that could break the surface tension. One way to improve this could be to find a larger container in which we could conduct the experiment. This way, we have more room to put the pins in, and they would not be accumulating in one specific place. In addition, the temperature of the room in which we conducted the experiment might not have stayed constant. Therefore, there may have been a change in the attractive forces of the molecules, causing a decrease or increase in the amount of weight the "skin" is able to hold. In future experiments, we could use a thermometer in order to monitor the temperature more sufficiently. ...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 Chemistry 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 Chemistry essays

  1. Percentage of Water In Popcorn

    The gamma kernels are composed of 16.7%, 15.7%, and 14.8% water, while the delta kernels contain 19.4%, 17.0%, 19.0% water for trials 1, 2, and 3 respectively. (Refer to appendix for original data and calculations). See Table 1 - Percentage of Water in Popcorn Beta, Gamma, and Delta The data

  2. The Drop of Water

    could have impacted the results if the size of a drop is affected by the amount of water in the medicine dropper. If I were to repeat this experiment again, I would use different measurement instruments as well as find the volume of water in each instrument from mass.

  1. Change of Potential Difference in Voltaic Cells Lab Report

    As the concentration of copper sulfate solution increases, the potential difference (voltage) between the two half cells increases. Sample Calculations Preparation of Copper sulfate Penta-hydrate solution To prepare 50 ml of 1dm-3mol (M) copper sulfate solution, use the formula: Mass = number of moles molar mass The molar mass of copper sulfate pentahydrate is 249.71g/mol.

  2. Dissolved Oxygen in water

    the raw sewage, water from air and bacteria tank, water from the chlorination tank and water from the oxygenation tank. Dependant variable: The dependant variable is the dissolved oxygen content because it will vary depending on the place from where we take the water sample.

  1. Should we be recycling more alluminium in the future?

    Nonetheless, there are many important issues that have arisen related to Aluminium. The chart above shows statistics of which areas aluminium is used. Clearly, transportation is the area that uses most aluminium, with 26%. This is probably because there is a wide range of transportation, such as buses, cars, planes, bicycles, etc.

  2. Organic lab. Comparison of alkanes and alkenes

    and a big flame forms, which lasts circa as long as the hexane combustion. As the fire blazes, a lot of thick black smoke rises from it, and the walls of the evaporing basin become first brown, and then progessively a darker until they become almost black.

  1. Chemistry lab reort-molar volume of hydrogen

    102.44 Vapor pressure of water (kPa) 3.17 at 25.0 *All these reference data are from the supervisor. Observation This time, faster and more vigorous reaction occurred than first trial reaction. Many bubbles spurted up along the burette. The surface of the HCl solution falls rather quickly.

  2. The chemistry of atmospheric and water pollution.

    Thus ozone takes up more mass in a given volume than oxygen resulting in a higher density. Ozone is more reactive than oxygen as it is a more powerful oxidant. This is because oxygen contains a stable double covalent bond while the ozone molecule has a double covalent bond and a single coordinate covalent bond.

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