Part B: The graduated pipet’s average density at 22.3 °C was determined to be 0.9785g/mL with a percentage error of 1.89% shows the graduated pipet to be more accurate and precise. Part C: Density of an unknown NaCl solution was measured and a calibration curve used to determine the percentage of NaCl by mass in the solution. y=0.007x + 0.998 which concluded that the concentration of the sodium chloride solution was 3.14%. INTRODUCTION Anything that you can see, touch, taste or smell, occupies space and has mass, it is called matter. Matter can be a gas, a liquid,
Write a hypothesis on what you think will happen when water is added. 3. Fill the test tube with two thirds of water and record the results. Copper (II) Sulphate Solution and Iron Nail 1. Record physical properties of the copper (II) sulphate
If the reaction is first order, its graphical representation is seen as ln[A] (natural log of concentration) vs. time, and the slope of its like is also the negative rate constant. Finally, for a second order reaction the graph is shown as 1/[A] (inverse of concentration) vs. time, and the slope of its given line is the positive rate constant. By understanding the rate law and finding the value of the correct rate constant with respect to the order of the reaction, one can determine the half-life of the crystal violet. This is because the crystal violet undergoes a decay reaction with the sodium hydroxide. According to Beer's Law, the absorbance of crystal violet is proportional to its concentration.
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.
-Exothermic is energy needed to break the bonds is less than the energy released and endothermic is the energy needed to break the bonds is greater than the energy released. 3. Read the entire laboratory activity. Form a hypothesis about how to distinguish exothermic and endothermic processes. Record your hypothesis on page 123.
Lab 4: Determination of Percent by Mass of the Composition in a Mixture by Gravimetric Analysis Introduction Thermal gravimetric analysis is used to determine the percent by mass is used to determine the percent by mass of a component in a mixture. When a mixture is heated to an appropriately high temperature, one component in the mixture decomposes to form a gaseous compound. The mass of this particular component is related to the mass of the gaseous compound. In this experiment, the percent by mass of sodium hydrogen carbonate (NaHCO3) and potassium chloride (KCl) in a mixture will be determined. Experimental First, we weighed 2 samples, each has 1 gram of NaHCO3-KCl mixture Second, we put the samples in 2 crucibles (A and B) and weighed them.
ADH aids the reabsorption of You correctly answered: a. water. 03/31/14 page 1 Experiment Results Predict Question: Predict Question: What will happen to the urine volume and concentration as the solute gradient in the interstitial space is increased? Your answer : c. The urine volume and concentration will increase. Stop & Think Questions: Why is the solute concentration (mOsm) in the proximal tubule the same as in the blood? You correctly answered: d. Because water and many plasma solutes filter into Bowman's capsule.
The following data were obtained when a sample of barium chloride hydrate was analyzed as described in the Procedure section. Calculate (a) the mass of the hydrate, (b) the mass of water lost during heating, and (c) the percent water in the hydrate. Mass of empty test tube 18.42 g Mass of test tube and hydrate (before heating) 20.75 g Mass of test tube and anhydrous salt (after heating) 20.41 g. Mass of the Hydrate is 2.33g. Loss (H2O) is 0.34g. Percent H2O in Hydrate is equal 0.34/2.33=14.6% 3.
To achieve this data we have a tube filled with water connected to a pressure sensor that doubles up as a transducer converting the pressure change as an electrical signal, which via software is being graphed. The other end of the catheter is connected to a funnel with a balloon atop and this funnel is junctioned using a 3-way stopcock. The tube is filled with water end to end, the balloon attached on the funnel is blown up which in turn puts pressure on the water which puts pressure on the pressure sensor, that transudes the pressure difference in to an electrical signal and LabView software displays that signal as a graph. Documenting and analyzing the step input when the balloon is popped is the purpose of this lab. Introduction The purpose of this lab is to build a catheter system, with an inflated balloon applying pressure to the catheter being recorded by the computer and being graphed.
Explain how you determined this. a. Pyrite hypothesis accept/reject = Rejected The hypothesis was rejected as the pH levels in the water increased when tested. While it was only one level, it was higher than the original sample. b. Coal hypothesis accept/reject = Rejected The hypothesis was rejected as the pH levels in the water increased when tested.