Splatters Lab

In this experiment, we are trying to figure out how many droplets of water a penny can hold while face up. Before we began the experiment, we already knew that water molecules stick together as long as gravity isn't stronger than the water. In the experiment we had water, soapy water, and rubbing alcohol.

There are several sources of error to this experiment due to random and systematic errors. The only source of random error was the measurement that we took through the graduated cylinder which was only accurate to the nearest 1%. We took the largest error from this one percent, which was +/- 3. The largest relative error this yielded was only 3%, so this did not affect how precise this experiment was too much. We can still make this more precise by making the masses of the water larger. For example if we started the masses at 300mL and went up by 50mL, the largest error this would yield would be 2% due to the largest error being +/- 5. This would cause smaller errors in the amount of water.

I took the graduated cylinder and started filling it up with water until the bottom of the meniscus was to the the 100.0 mL mark with the assistance of a dropper pipet. I then took the 13 x 100 mm test tube and slowly poured the water from the graduated cylinder into the test tube until it was full to the top. I then poured the water in the test tube out into the sink and put the graduated cylinder on the counter so I can get an accurate measurement of the lower meniscus to record on my data table. I once again followed the same procedure again filling a second test tube with water from the graduated cylinder then setting it on a straight surface to get an accurate measure of the volume to

* By using the dropper and measuring cylinder, an amount of 5ml milk was placed in the test tube

o Start with the small marble and drop it from 10cm, do not apply any force to the marble and make sure it lands somewhere in the middle of the tub.

In the third stage of this experiment, the density of a liquid was determined and compared to known standards. A 100ml beaker was filled to about half-full with room-temperature distilled water. The temperature of the water in ◦C was recorded in order to compare to known standards later. A 50ml beaker was then weighed on a scale in order to determine mass and recorded. A sample of the distilled water with an exact volume of 10ml was then placed in the 50ml beaker using a volumetric pipette. The 50ml beaker with the 10ml of water was then weighed again and the initial mass of the beaker was subtracted from this mass to obtain the mass of the 10ml of water. With the volume and the mass of the water now known, density was calculated using d = m/V and recorded in g/ml. This process was then repeated to check for precision and compared to standard values to check for accuracy. Standard values were obtained from CRC Handbook, 88th Ed.

Not only would spattering have been dangerous, it would have reduced the amount of the mixture left in the beaker for measuring. Another possible source for error is when heating in the final stages if all the liquid did not evaporate that would cause the reading on the scale to be too high, thus throwing off the data.

Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel, which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric measurements were the basis of the 3rd part of the experiment. It was displayed during this experiment that a pipet holds about 4mL and that there are approximately 27 drops/mL from a short stem pipet. Part 4 introduced the student to measuring

1.) Measure out 20ml out of the water and place it into a glass beaker

The topic for science fair is on blood spatter. If terminal velocity and height van affect the radius of a blood spatter print. To figure out whether after a blood splatter reaches terminal velocity and it starts to slow down will the radius start to become decrease. In this experiment the independent variable is the height the blood is dropped from, and the dependent is the radius of the blood spatter. Independent and dependent variables: The independent variable is the amount of sugar in each solution and the dependent variable is the levels of vitamin C the solution has.

Volume of water This was kept constant by using a 200 ml beaker to fill up the jars used in the experiment. The uncertainty of the volume of the water was: +/- 10 ml

Next, 45 drops of distilled water were slowly added to the solution. The drops were added at a slow rate, preventing the solution from bubbling or splattering. During this process, gas began to condense on the sides of the beaker. 9. Then, 30.1 mL of distilled water were measured using a 50 mL graduated cylinder.

Pour 20ml water in a 50 ml graduated cylinder to measure the ball volume (a marble).

When I designed multiple tests which were using the coca cola bottle with ⅓ (667 milliliters)which was for the first test and a Mountain Dew bottle for the second trial which was ¼ (500 milliliters). The second day we tested the group designed tests of ⅓ (667 milliliters) and ½ (1000 milliliters). The final test we did on the third day was ⅓ (667 milliliters) and ½ (1000 milliliters). After all three days of testing the group decided that ⅓ (667 milliliters) and a round cylinder bottle worked the best. Overall all of our tests were fair enough since they all had accurate results and we had good data recorded. The only difference between the ⅓ bottle and ½ bottle was that is that the ⅓ bottle went higher but came down faster than the ½ bottle. The Final Recommendation is to use a round cylinder bottle and ⅓ full of water (667 milliliters) because it goes the highest and it goes straight up since it has the perfect water

The lab to which I have referred is the dropping coffee filters from a known height in order to investigate terminal velocity. Having spoken to local physics teachers both before and after my presentation to