Name: 6.03: Calorimetry Data and Observations: Part I: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part I. (4 points) I observed that when the metal is placed inside the calorimeter, it transfers heat to the water making the water increase temperature while the metal will decrease temperature. I also noticed that the system was the metal and the surroundings is the water, this is because the water is taking in the heat from the metal making the water warm. Metal Name Mass of Metal Volume of water Initial temp.
Water from a variety of sources that receive precipitation is being sampled. Using a pH meter, the pH of water samples is being measured. In the first approach using titration methods in combination with pH measurement, the volumes of sulfuric acid needed for reaching two different pH levels are being measured. Difference in the volume of sulfuric acid used, is an equivalent for the amount of CaCO3 expressed in grams per (gL-1) in the analyte. Therefore the alkalinity of water samples is being calculated.
The importance of hydrogen bonding in biology Hydrogen bonds are extremely important in biological systems. Their presence explains many of the properties of water. They are used to stabilize and determine the structure of large macromolecules like proteins and nucleic acids. They are involved in the mechanism of enzyme catalysis. Properties of Water Property | Importance | Examples | Solvent | Metabolic processes in all organisms rely on chemicals being able to react together in solution.
Pre Lab Objective: The purpose of this lab is to obtain the mass and volume of two different metal samples, to graph data, to obtain the slope of graphed data and to display a best fit curve of experimental data in order to graphically determine the density of each metal Background: Understanding the relationship that exists between a substance’s mass and its volume. This relationship is expressed by the physical property called density. (D = M/V). In order to determine the volume of solids, a technique called water displacement is used. A fixed amount of water is added to a graduated cylinder and the volume of water is recorded.
II. Procedure: Equipment needed is a large beaker, various weights, a track, two levers, a string, force sensor, scale, a car, a tuna can, a sphere, a block, and cylinders. In the first part of the lab, first we predict the theoretical buoyant force water acts on the sphere, the block, and two cylinders using the above equation FB=ρgV and the volume for various shapes is V(sphere)=4/3πR3, V(cylinder)=πR2h, V(block)=LWH. Second we measure the buoyant force for each of those shapes taking its weights in and out of water by the force sensor and the scale respectively. The difference is the buoyant force FB=Wout – Win.
Carefully determine the mass of the Copper(II) Sulfate, crucible, and lid. 8. Obtain the accepted percent (by mass) composition of water. Pre-Lab Questions 1. Hydrates are crystal solids and water.
When looking a beaker of water of depth, x, the water has a weight of F=mg and a pressure calculated using Forcearea. Therefore, Pwater=FAbeaker=mgAbeaker=(ρwaterAbeakerx) gAbeaker=ρwaterxg. In a liquid, the pressure is consistent in all locations as long as the depth remains the same. In figure 2, the pressure below the block is the same as the pressure of the water at the same depth, but not any lower or higher than this specific depth. The buoyancy force of the water pushing up on the block is Fbouyancy=PwaterAblock=ρwaterxgAblock=mdisplaced waterg.
The Law of Conservation of Mass will also be expressed during the experiment, as it states mass is neither gained nor lost in a chemical change. Materials and Methods: The chemicals and materials used for this experiment consisted of copper turnings, HNO3, NaOH, H2SO4, zinc, HCl, 50ml beaker, hot plate, plastic funnel, aspirator, rubber tubing, ring stand, clamp, iron ring, weighing boats, magnetic stir bar, 10ml graduated cylinder, disposable pipets, filter flask, Buchner funnel, filter paper, distilled water, stirring rod, watch glass, and litmus paper. After gathering supplies, the ring stand was set up with the 50ml beaker on the stand along with setting up a funnel connected to tubing as an aspirator over the beaker. Then .2550g of copper turnings was weighed and added to the beaker. The aspirator was turned on and 4mL of 6M HNO3 was slowly added to the beaker.
Calculations involving the Mole, Avogadro’s Number, Molar Mass, Mole-Mole and Mass-Mole calculations in chemical equations. Combustion analysis and calculation of empirical and molecular formulas from composition analysis. Electrolytes and non-electrolytes. Precipitation reactions and solubility rules. Writing balanced molecular equations and net ionic equations.
Formula of a Hydrate Objective The objective of the experiment is to determine the percent composition of water in a hydrate and to determine the hydrate’s empirical formula. Theory/Background In this experiment, the main purpose was to identify the percent water in a hydrate and to determine the empirical formula of the hydrate. A hydrate is a chemical compound containing water (H2O). After finding the masses of every part in the compound, one would be able to solve for the complete formula of the hydrate. An anhydrous salt is a salt without the presence of water or any moisture.