The purpose of this lab was to determine the density of water and an unknown liquid, along with a rectangular solid and an irregular shaped solid. In this lab, the relative density was calculated and then used to make an educated guess on the substance. Density is the relationship between the mass of a substance and the amount of space taken up. This measurement is influenced by the mass of atoms, the size, and how they are arranged. The density of the four objects was determined by using the mass (g) and volume (mL or c3). Mass is the property of matter that measures its resistance to acceleration. In addition, volume is the amount of space that a substance or object occupies. Finally, the mass (g) was divided by the volume (mL or c3) to find the final density (g/mL or c3). …show more content…
It was hypothesized that the density of water was 1 g/mL and the unknown liquid has a density around 1 g/mL because it had a low viscosity, similar to the water.
In addition, the unknown liquid smelled like rubbing alcohol, which has an extremely low density. For the solids, it was predicted that the irregular shape density was dramatically higher than the rectangular shape based on sensory estimates and how heavy the two metals felt. In addition, it was assumed that both of the solids were metals based on their physical attributes. Also, the metals were not alkali or alkaline metals because these metals are highly reactive. From the silver color, the two metals could not have been gold or copper. It was predicted that the two metals were aluminum and silver and their densities were 2.7 and 10.49
respectively. Methods First, the mass of the two solid objects were calculated. Mass was determined by using an electronic Centigram balance for both of the solids. Then, the volume of the solids was calculated. For the solids, volume was calculated by utilizing a method called water displacement. To find the volume of the two solid metals, 30 mL of water were added to a 100 mL graduated cylinder. Then, the solids were placed into the water one at a time. Finally, the 20 mL of water was subtracted from the total volume with both the water and solid in the cylinder. This result was the volume of the solids and this process of calculating the amount of extra volume taken up is called water displacement. Once both the mass and volume measurements were determined for the solids, the mass was divided by the volume to find the density. For the liquids, the volume was a controlled variable and it was decided to use 10.0 mL of the water and the unknown liquid. For mass, an empty beaker was placed onto the Centigram and then the balance was zeroed. Then, a beaker of the same size was placed on the scale containing the 10.0 mL of liquid. The number displayed on the scale was the mass of only the liquid. Once the two measurements were determined, the mass was divided by the volume to find the density.
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
The purpose of the Unknown White Compound Lab was to identify the unknown compound by performing several experiments. Conducting a solubility test, flame test, pH paper test, ion test, pH probe test, conductivity probe test, and synthesizing the compound will accurately identified the unknown compound. In order to narrow down the possible compounds, the solubility test was used to determine that the compound was soluble in water. Next, the flame test was used to compare the unknown compound to other known compounds such as potassium chloride, sodium chloride, and calcium carbonate. The flame test concluded that the cation in the unknown compound was potassium. Following, pH paper was used to determine the compound to be neutral and slightly
The unknown bacterium that was handed out by the professor labeled “E19” was an irregular and raised shaped bacteria with a smooth texture and it had a white creamy color. The slant growth pattern was filiform and there was a turbid growth in the broth. After all the tests were complete and the results were compared the unknown bacterium was defined as Shigella sonnei. The results that narrowed it down the most were the gram stain, the lactose fermentation test, the citrate utilization test and the indole test. The results for each of the tests performed are listed in Table 1.1 below.
Anne Zhang 3/6/14 BSGE 7-1 Lab Report Problem Paragraph 1 Question: What is the effect of temperature on the dissolving time of an Alka-Seltzer? Alka-Seltzer is made up of baking soda, aspirin, and citric acid which gives the tablet the fizz when dropped in any temperature water. “Alka-Seltzer is a medication that works as a pain reliever and an antacid.
That familiar fizzing you hear when you drop an Alka Seltzer tablet into a glass of water is the result of a chemical reaction, and chemical reactions are extremely prevalent when it comes to what living things do to carry out life processes. In addition, environmental conditions can alter the results of chemical reactions, and in this lab, we will be answering the
Furthermore, you will compare their reactions with water, universal indicator, vinegar and iodine solution to discover what the mystery powder is. Purpose: To identify the mystery powder based on its physical and
I did accomplish the purpose of the lab. First, I determined the percentage of water in alum hydrate, and the percentage of water in an unknown hydrate. The results are reasonable because they are close to the example results. Second, I calculated the water of crystallization of an unknown hydrate. Furthermore, I developed the laboratory skills for analyzing a hydrate.
3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water.
Regarding the densities of Coke and Diet Coke, I believed that the density of coke would be greater than the density of Diet Coke. Because the content of Coke contains more sugar than Diet Coke, it would contain more mass and since density is mass dependent, Coke would be denser than Diet Coke. From the results of the experiment, there was a slight difference between the densities of Coke and Diet Coke. The measurements obtained from the pipette and the graduated cylinder demonstrated that Coke is denser than Diet Coke while Diet Coke was shown to be denser than Coke using the burette. With the pipette, the average density of Coke is 1.02 and the average density of Diet Coke is 0.99. With the graduated cylinder, the average density is 0.976968 and the average density of Diet Coke is 0.95. With the burette, the average density of Coke is 0.99 and the average density of Diet Coke is 1.0. Among the three instruments, the most precise was the graduated cylinder and the most accurate was the volumetric pipette. Since density is defined as mass/volume, changing the volume of Coke or Diet Coke would have changed.
Many steps were taken in order to narrow down and figure out which bacterium unknown 413 is. One of the first step taken in identifying unknown 413 was to do a gram stain. The gram stain, which was purple, resulted in gram-positive cocci. The gram-positive eliminated all the possibilities of unknown 413 being any gram-negative bacteria such as Escherichia coli, Enterococcus faecalis etc. The cocci morphology result eliminated any possibilities of it being any bacteria that are a rod. This left five different genera: Staphylococcus, Lactococcus, Micrococcus, and Enterococcus as a choice for the unknown.
Finding the Densities of an Unknown Solid and Liquid in Order to Determine What they Are
Mold is a member of the fungi family. Since mold is part of the fungi family, it cannot use the sun to obtain energy. This means that mold has to use other plants or animals to grow. Even though they cannot see them, there are millions of mold spores in the air. These spores settle down and start to multiply which can be done rapidly or slowly as long as it has a food source. Mold usually grows best in warm environments, but it can still grow in cold environments also. Mold can cause illness such as vomiting or feeling nauseated when it is eaten or when it smells bad.
The actual, theoretical, and percent yield of sodium chloride was found. Sodium Carbonate was mixed with hydrochloric acid and the liquid was boiled until there was nothing left. The result was the production of salt, or sodium chloride.
In experiment 5, we are learning about density and specific gravity in measurements. Density is measured by mass divided by volume in order to get the ratio of the mass of an object to its volume. Specific gravity, on the other hand, is the density of a substance divided by the density of water and will cancel out the units in order to get a unitless measurement. Mass and Volume can be measured in two different ways, first mass can be calculated by directly placing it on the triple beam scale directly, or by weighing the difference. Volume can be calculated by displacement in the graduated cylinder or by calculating its dimensions. In this experiment, the objectives were to calculate the density of a solid by measuring its mass and volume,
Density is “Is a measure of mass per unit of volume. Density is what helps make things float, anything that has a density less than one it floats. The more density the object has, the higher the mass per volume. For example, take a sponge, most of the artificial ones are made out of foamed plastic. Therefore sponges hold or contain a lot of density. If you were to take a sponge and melt it into a plastic soup without the bubbles, it will stay one pound but it will become much denser. Density is probably the most important thing thats needed in order for an object float.1,000.00 kg/m³ is the equation for the density of water.(chemforkids.com)