I. INTRODUCTION
Archimedes’ principle indicates that the upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid (Wikipedia), or in simpler terms, a floating object will displace a volume of fluid if it has weight equal to the object that is floating. The primary purpose of this lab is to explore and demonstrate density. Density is defined as an object’s mass per unit volume, or essentially, a measurement of how close and tightly matter is crammed together within an object. Density can be found by dividing the mass of an object by its total volume. In this experiment, a grape and beaker of water were used to act out Archimedes’ principle by adding salt to the water so the grape could float, and then add more water so the grape could be suspended in the center of the beaker. The hypothesis was that as more salt was added to the beaker, the grape would start floating since the density of the water was increased; once pure water was added, the grape would slowly start to sink due to the density of the salt water being lowered again, resulting in the suspension of the grape in the center of the beaker.
II. METHODS
To begin this experiment, 80.0mL of distilled water was measured using a graduated cylinder and promptly poured into a 100mL beaker. Next, a small grape was dropped into the beaker and automatically sunk to the
When the pH is not at its optimum, the differing pH's will disrupt the bonding between the R groups of the amino acid causing its structure and the shape of the activation site to change
because each of the objects displaced the water by 1 mL, their mass over that mL is their density.
Purpose: To become familiar with the International System of Units and common laboratory equipment and techniques. To learn how to determine volume, mass, length, and temperature of a wide variety of items. To learn how to calculate density and concentration of dilutions.
Density is the amount of matter per unit of measurement (Merriam-Webster. Merriam-Webster, n.d. Web. 26 Aug. 2016.). If water has a density of 1.0 g/mL and you place a substance with a density of 1.8 g/mL the substance will sink because it is denser than water. Density is often measured in g/cm^3 or g/mL because the formula for density is D=m/v.
In the lab we filled the first beaker up with water. Then we took a pipet (filled with the liquid) and dropped water droplets onto the
E. What would happen if you dropped the object into the beaker while using the Archimedes’ Principle method instead of submerging the object?
If I fill up two different containers with different amounts of water, then I will be able to understand the density of the two different mass/volumes of two different containers.
First students obtained 8 graduated cylinders and labeled them. Each one contained a different ratio of vinegar and water. These graduated cylinders with the liquid were weighed and recorded.Then, students obtained an Alka-Seltzer tablet and recorded its mass. Then one alka-seltzer tablet was dropped into each of the graduated cylinders. Students had to
The next step in this lab is to rinse the Erlenmeyer flask with distilled water down the drain and then repeat the experiment, this time adding 10 ml of 0.10M KI and 10 ml of distilled water to the flask instead. The flask should again be swirling to allow the solution to succumb to the same temperature as the water bath and once it has reached the same temperature, 10 ml of 3% H2O2 must then be added and a stopper must be immediately placed on the flask and recording should then begin for experiment two. After recording the times, the Erlenmeyer flask must then be rinsed again with distilled water down the drain. After rinsing the flask, the last part of the lab can now be performed. Experiment three is performed the same way, but instead, 20 ml of 0.10 ml M KI and 5 ml of distilled water will be added and after the swirling of the flask, 5 ml of 3% H2O2 will be added. After the times have been recorded, data collection should now be complete.
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.
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
I then measured out 100ml of soil and then I poured beaker number one through the funnel and let it filter down into beaker number five. I repeated the process with beakers two through four pouring them into beakers six through eight. When completed I let the filtration complete before making my observation. Here are my results.
The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.
The purpose of the fluid flow meters experiment was to determine the operating characteristics of the Venturi and orifice meters. The purpose of the tray hydraulics experiment was to study the vapor and liquid tray hydraulics parameters for sieve, or perforated, trays in a distillation column. By performing experiments based on theory and comparing results to literature values, the objectives of this experiment can be achieved.
In this experiment, The purpose of this experiment is to investigate the measurement of the actual volume contents of volumetric glassware. In the beginning of the experiment, the volumetric glassware should be clean and dry before used. The volumetric glassware, measuring cylinder and pipette should be handled with care and all the precautions were be taken during the experiment was held. This was to ensure to avoid any errors such as parallax error especially while reading water meniscus. This experiment must be repeated three times or more and take the average reading to get more