The objective of this lab was to conduct an experiment to analyze the molar components in alum. This was conducted by heating the alum till the water had evaporated and then determining the number of moles for each component. Then using the these amounts to figure out the empirical formula for alum.…
The purpose of this lab is to calculate the density of aluminum with different masses and volumes of aluminum bits and water.…
3. To determine the thickness of a piece of aluminum foil using the density concept.…
By measuring the mass of a piece of foil and by calculating its area, the thickness of the foil can be obtained from these quantities and the known density of aluminum, 2.70 g/cm3.…
Insert the tiny pellets of aluminum which you recorded the mass in step 1 of this procedure in the measuring cylinder containing water and record the final volume.…
A. All chemical used in this test are binary compounds. What portion of the periodic table is responsible for the color observed?…
10. ____ What was concluded about the structure of the atom as the result of the gold foil experiment? (1) A positively charged nucleus is surrounded by positively charged particles. (2) A positively charged nucleus is surrounded by mostly empty space. (3) A negatively charged nucleus is surrounded by positively charged particles. (4) A negatively…
1. Be careful with copper (II) sulphate solution it is poisonous and corrosive. handle with care…
1. Make a hypothesis about how you think the two species of Paramecium will grow alone and how they will grow when they are grown together. (Make sure you understand what a hypothesis is before you address this!)…
The purpose of the Density Lab was to determine the identity of four unknown solids and two unknown liquids by calculating their densities and comparing them to a density chart, taking into account error analysis and finally classifying the substances. In order to calculate this density, we first found the mass of the container that was to be holding the substances. We then found the volume of the substance, and lastly determined the mass of the container and substance. We subtracted (Container + Substance) – Container to find the mass of simply the substance. In order to distinguish density, we took the final mass divided by the volume, and identified the substances based on Density Charts we found online. Originally we hypothesized that we would be able to identify these substances based on the densities we calculated, yet this proved to be harder than it seemed, however our hypothesis was correct. We now could concluded the densities and identification. The density of Unknown Liquid 1 was 1.26 which was found to be Colorless Glycerin (also density of 1.26) and Unknown Liquid 2 was 0.88 or Rubbing Alcohol (colorless). Unknown Solid 1 has a density of 7.20 or Iron, Solid 2 is 2.59 and Aluminum, Solid 3 is 5.47 and Tin, while Solid 4 has a density of 9.81and Nickel? We…
2. Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did.:…
Specific heat and climate were the primary focus of this lab. Specific heat is defined as “the measure of the ability of a substance to change temperature”. The purpose for carrying out this lab was to determine the specific heat/rates of both soil and water, and then comparing them. Students also were to relate specific heat to climate. Students were to determine which substance expressed a higher specific heat by using the formula, (q=m*Δt*c). Then they were to explain how specific heat and climate are in relation to one another.…
Regents Chemistry Quarter 1 Midterm Review 1. The percent by mass of oxygen in Na2SO4 (formula mass = 142) is closest to 1) 11% 3) 45% 2) 22% 4) 64% 2. Given the unbalanced equation: __Al(s) + __O2(g) → __Al2O3(s) 3. 4.…
Arsenic damages any life forms it has contaminated. Most animals, fish, bacteria, and birds will die when they come into contact with arsenic. Plants cannot properly photosynthesize.…
Ernest Rutherford’s Gold Foil Experiment was a major stepping stone one the way to discovering what the atom was really made up of. From the beginning of his research with alpha particles to his discovery of the atomic nucleus, Rutherford made many contributions to the microscopic world of the atom. The Rutherford Experiment, otherwise known as the Gold Foil Experiment, was the crown of his achievements, and it was during this experiment that he discovered the atomic nucleus. (Aydin &Hanuscin, p.59) He made this happen by putting his past research on alpha particles to the test, such as the knowledge that an alpha particle should be less massive than the atom. Therefore the alpha particles should pass directly through the atom, unfazed. When the particles started to reflect off of the atoms in obtuse angles, Rutherford began to question the plum pudding model of the atom. It did not take him long to scientifically prove the model wrong, it only took about 2 years after the initial experiment to get enough proof to disprove the Plum Pudding Model and publish his own atomic model, The Rutherford Model. This article will be focusing on Rutherford’s Gold Foil experiment and how the experiment’s results changed how scientists would look at the structure of the atom for many years to come. (Nagendrappa, p.1013,1014)…
