108. Two common sugars, glucose or C6H12O6, and sucrose or C12H22O11, are both carbohydrate4s. Their standard enthalpies of formation are: Glucose = -1273 kJ/mol and Sucrose = -2221 kJ/mol. Using this data: a) Calculate the molar enthalpy of combustion to CO2 (g) and H2O (l). b) Calculate the enthalpy of combustion per gram of each sugar.
Hypothesis: Using melting points can help determine the difference in total carbon atoms and branches between two or more compounds. Materials List: 1 Spoon 1 Paper towels 3 Small rubber bands 2 Clean sheets of paper 1 Beaker, 100 mL, glass 1 Burner-fuel 1 Burner-stand 1 Goggles-Safety 1 Magnifier, dual 1 Thermometer-in-cardboard-tube 1 Capillary tubes-3/pack 1 Tetracosane Crystals - 0.2 g in Vial 1 Tetradecanol Crystals - 0.2 g in Vial Procedures: Prior to beginning the lab exercise, read the instructions carefully. Begin by setting up a derivative melting point table to collect the data accumulated during the exercise. This lab uses heated water so be sure to follow safety procedures carefully. While conducting this laboratory experiment, be sure to use minimal amounts of each substance in order to create the habit of using only the amount necessary.
Physics Lab Report: Popper Hopper. Purpose: The purpose was to find the speed of a hopper popper as it leaves the table. Materials: The materials used were a timer, ruler and a popper Procedure: I put the popper on the table. When it popped up in the air i looked how high it went up and how long it took. Data: |Trial # | | |4.5 secs |52 cm | |3.1 secs |90 cm | |2.8 secs |84 cm | |1.3 secs |74 cm | |.8 secs |65 cm | Calculations & Data Analysis: Given: mass = .0102 kg, height = .73 m, g= 9.8 m/s Unknown: velocity?
COMPOSITION AND SEPERATION LAB REPORT INTRODUCTION The purpose of this experiment is to study the physical and chemical properties of popcorn, sand, salt and iron fillings in order to separate them out and to find the percent composition of them. The percent composition of a component in a compound is the percent of the mass of the component in relation to the total mass of the compound. By using the percent composition, one can find the amount of water that is in a kernel of popcorn or find the total percent recovered when separating out different components of a solid mixture. EXPERIMENTAL Please refer to the Chemistry 184 Laboratory—Fall 2011 website: Lab #2 Composition and Separation Lab *Note that instead of using a Bunsen Burner, a ceramic hot plate was used. *Note that only one kernel of popcorn was used instead of several.
Which of the following diagrams best represents the directions of the actual forces acting on the box as it moves upward after the push? 3. An ideal spring obeys Hooke's law, F = kx. A mass of 0.50 kilogram hung vertically from this spring stretches the spring 0.075 meter. The value of the force constant for the spring is most nearly (A) 0.33 N/m (B) 0.66 N/m (C) 6.6 N/m (D) 33 N/m (E) 66 N/m 4.
Cone experiment Aim: -The aim of this experiment is to find the velocity of a falling paper cone. To find the velocity you will need to find the time taken for the cone to fall, the set distances and the relationship these two factors. The rubber band was patented in England on March 17, 1845 by Stephen Perry. The majority of rubber bands are made from natural rubber, which is extracted from the latex of the rubber tree, due to its superior elasticity. Apparatus: - A4 paper - Scissors - Meter tape - Chronometer - Scotch tape Variables: Dependent variables: - Height from which the cone id released - Independent variables: - Time taken by the cone to fall - Constant variables: - Weight of the cone - Area of the cone - Wind in the room Method Step 1: take out the A4 paper, scissors and scotch tape.
Oscillations of a Mass - Spring System Determination of “K” by the use of a Spring Oscillations System Experiment #3 for AMS320 involves a spring oscillating system to determine the value of “K”, the force value of an oscillating spring system. The spring is secured to a solid point and allowed to hang vertically below the solid stand. On the bottom of the spring is attached a steel ring with in which to attach a known amount of weight in (kg). The weights are added to the ring and the spring is pulled into a small amount of tension and released. The spring will then oscillate up and down and a stopwatch will be used to measure the amount of time it takes the weight and spring system to stretch and recoil ten times.
Grind an aspirin tablet into a fine powder by using a mortar and pestle. Weigh accurately an aspirin powder. Determine the mass and record it on a data table. 2. Put aspirin powder in a beaker and pipette exactly 30 cm3 of a 1 M NaOH solution onto the powder.
Newton’s Second Law Lab Purpose: The purpose of this experiment was to determine the relationships between mass, force and acceleration as well as to prove Newton’s second law Hypothesis: It was hypothesized that there would be an inverse relationship between acceleration and mass; as the value of the mass increased the acceleration decreased. As well it is hypothesized that there would be a direct relationship between the net force and acceleration; as the net force increases the acceleration increases as well. Materials & Method: The materials that were required to do the experiment were a metre stick; its purpose was to measure the amount of string that is going to be used to drag the cart. Next equipment needed for the lab was a dynamic cart; it was going to be dragged by the string with a mass on the other end and will find relationships between these two. Also string (about 75cm) was needed in this experiment which would help pull the cart with the help of the masses that were used.
Figure 1 shows this effect in detail. Here a starting tug of 7 pounds on one side of a rope wrapped 3 times around a metal pipe is enough to hold back a pulling (resistive) force of 2,000 pounds! Figure 1: Frictional Resistance Force Increase due to wraps around a cylinder The equation that governs this “force magnification” effect depends only upon two parameters, the coefficient of friction between the rope and the cylinder and the number of wraps that are made: T2 ---- = e 2 π μ N T1 Where: T1 = Starting force T2 = Resistance Force (finish side) μ = Coefficient of static friction N = Number of wraps around the cylinder. In the above figure we can calculate the resistive force: T2 = T1e 2 π μ N = (7) e (2 π (0.3)(3)) = (7)(285) = 2000 In our lab today we will set up an experiment where we will determine the force magnification as a function of the number of turns of Nylon rope around a cylinder of Teflon. By plotting this data we can, using TRENDLINE analysis, easily determine the coefficient of friction, μ, of this system.