Chemistry: Measurements And Significant Figures
Measurements and significant figures are important in Chemistry because it shows how accurate something is, and it shows which place value is the estimated one if/when used correctly. In this lab, the density for water that was found is 0.99g/mL and the percent error was 1%, and 1% is good. An error that could have occurred while finding the density for water was that the measurement were not exactly correct because not everything is going to be perfect.
The density for Copper that was found was 8.5g/mL, and the percent error was 5%, and 5% is fair. An error that occurred during the lab for Copper was; there were air bubbles trapped in the metal shot which resulted in a higher mass and volume. This error effected both the mass and volume
Essay On Penny Lab
444 Words | 2 PagesTo calculate the percentage of Cu, we divided the final mass of the penny 0.09 and the initial mass of 2.47 and multiplied by 100. To calculate the percentage of Zn, we divided the final mass of the penny 2.38 and the initial mass of 2.47 and multiplied by 100. During the experiment the hydrochloric acid donated its hydrogen ions in the reaction and then the chloride ions reacted with the zinc ions in the solution. Thus, the zinc dissolved in the highly acidic solution which was caused by the high concentration of H2 ions. Hydrogen gas was generated during the reaction which was seen when bubbles were formed as the penny was dissolved into the beaker.
Millsaps College Lab Manual
1232 Words | 5 PagesThe specific heat of three elements were tested zinc, copper, and lead. The experiments ran from Monday to Thursday and allowed a precise amount of heat to be determined. The experiment had multiple errors which were caused by random errors not systematically errors. In order to combat this, certain items were kept same. This was called a control.
All That Glitters Lab Report
511 Words | 3 PagesIn the lab “All That Glitters” the objective that was focused on during the lab was calculating the density, volume and mass of various substances. The method that was used in finding the volume of the samples is called the displacement method. This is a process where the volume of the water in the graduated cylinder is calculated before and after the sample is placed. In this lab, the goal of the experiment was to identify and come to consensus about what the unknown substance might be. For this experiment, the required materials were ten pre and post pennies, unknown sample, graduated cylinder, weigh boat, water, paper towels and a weighing scale.
Penny And Dime Lab Report
496 Words | 2 PagesIn almost every experiment, there’s an independent and dependent variable, a constant, and a control group. The independent variable in this lab was the coins. The dependent variable was the density. The constant was the amount of water. In this lab, there was no control group .
Compare And Contrast The Determination Of The Mass Of Pennies In The 1980's
736 Words | 3 PagesIf we were given a random sample of pennies, then we could measure the mass and the volume of the pennies. From these measured values we could calculate the density. Then we could compare our calculated density to the given density value of copper and we could find the the percentage of error between copper and the measured density. Conclusion: If the percentage of error between the copper and the measured density of the pennies was large and the values were not in comparison to the density of copper, then we would know that the density of a penny is not the same as the density of pure copper.
Copper Cycle Synthesis
578 Words | 3 PagesIn this experiment, the evolution of the copper cycle was observed through a series of reactions. Four different copper compounds are formed through different reactions to inevitably lead to the recovery of Cu(s). This primary goal of this experiment was to study the Law of Conservation of Mass and perform 5 reactions on copper compounds. As Jenna Winterberg states in her book “Conservation of Mass,” the first part of this law is that mass or matter cannot be created. The second part of the law is that mass or matter cannot be destroyed .
Mole Mass Lab Report
372 Words | 2 PagesI. Purpose: To experimentally determine the mass and the mole content of a measured sample. II. Materials: The materials used in this experiment a 50-mL beaker, 12 samples, a balance and paper towels. III.
Penny Lab Report
463 Words | 2 PagesThe purpose of this lab was to change pennies from copper to silver to gold, like alchemists have attempted to do in history. Through the data and observations gathered throughout this experiment, it can be concluded that the pennies were not changed into a different element. For example, the density of the penny from 2005; which was the penny that was experimented on to see whether or not it could turn into silver; was 4.62 g/cm3 before the experiment and 4.89 g/cm3 by the end of the experiment. If this copper penny really would have turned into silver, then the density of the penny would be 10.49 g/cm3; which is the density of silver; by the end of the experiment. The penny may have turned silver in color, but this was only because it was plated in the zinc that was added to the beaker of water in the experiment.
Nt1310 Unit 6 Lab Report
631 Words | 3 PagesIn this lab there were five different stations. For the first station we had to determine an unknown mass and the percent difference. To find the unknown mass we set up the equation Fleft*dleft = Fright*dright. We then substituted in the values (26.05 N * 41cm = 34cm * x N) and solved for Fright to get (320.5g). To determine the percent difference we used the formula Abs[((Value 1 - Value 2) / average of 1 & 2) * 100], substituted the values (Abs[((320.5 - 315.8) /
Penny Boat Lab Conclusion
239 Words | 1 PagesOn our paper we predicted the amount of pennies that could fit in the boat before it sank. We tested the boat in the water and added pennies one by one. We then calculated the mass of pennies that fit in the boat and the density of it. The purpose of this Lab was to make a boat that holds as many pennies as possible and understand how to calculate
Copper Cycle Lab Report
800 Words | 4 PagesIntroduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
Stoichiometry Lab
563 Words | 3 Pages3. In this experiment, the percent yield was 90%. This number implies that there was little error in this experiment. However, this result could have been caused by certain external factors.
Copper Recovery Lab Report
471 Words | 2 PagesThroughout the experiment, copper was altered a total of 5 times, but after the final chemical reaction, solid, elemental copper returned. Each time the solution changed color, a precipitate formed, or when gas appeared, indicated that a chemical reaction was occurring. For the first reaction, copper was added to nitric acid, forming the aqueous copper (II) nitrate (where the copper went), along with liquid water, and
Essay On Significant Figures
712 Words | 3 PagesWhen you multiply or divide measurements, the number of significant figures in the answer is equal to the number of significant figures in the least precise measurement. For the addition or subtraction of measurements, the number of significant figures in the answer is equal to the number of decimal places in the least precise measurement. Nonzero integers always count as significant figures, and exact numbers, quantities obtained without the use of a measuring device, have an infinite number of significant figures. For example, the number 15.1 has three significant figures because none of the integers are zero. However, there are three classes of zeros: leading zeros, captive zeros, and trailing zeros.
Water Hydration Lab Report
603 Words | 3 PagesIn this experiment, the amount of water lost in the 0.99 gram sample of hydrated salt was 0.35 grams, meaning that 35.4% of the salt’s mass was water. The unknown salt’s percent water is closest to that of Copper (II) Sulfate Pentahydrate, or CuSO4 ⋅ 5H2O. The percent error from the accepted percent water in CuSO4 ⋅ 5H2O is 1.67%, since the calculated value came out to be 0.6 less than the accepted value of 36.0%.This lab may have had some issues or sources of error, including the possibility of insufficient heating, meaning that some water may not have evaporated, that the scale was uncalibrated, or that the evaporating dish was still hot while being measured. This would have resulted in convection currents pushing up on the plate and making it seem lighter by lifting it up
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