Learning about the different kinds of scrap electric cables and copper wire is important when you are looking to sell them as scrap metal to a local scrap yard of wire it is tough to know what you have until you spend some time with a small scale and experiment to see what percentage of copper is inside. You measure the sides of the cube to find the volume and weigh it to find its mass when you calculate the density using your measurements, you get 878 grams/ cm3 copper's accepted density is 896 g/cm3 what is your percent error solution: experimental value = 878 g/cm3 accepted value = 896 g/cm. A student is assigned the task of determining the mass percent of silver in an alloy of copper and silver by dissolving a sample of the alloy in excess nitric acid and then precipitating the silver as agcl first the student prepares 50 ml of 6 m hno3 (a) the student is provided with a stock solution of 16 m hno3, two 100 ml. You will dissolve the penny, and prepare copper amine complexes, which are blue you will calibrate the spectrometer using solutions made from pure copper using the calibration curve, you will determine the concentration of copper from the dissolved penny, and ultimately the mass percentage of copper. Malachite from the data you collect you will be able to determine the weight percent of copper in each of the ores objectives: use a series of chemical reactions to determine the percentage of copper in two common forms of copper ore, malachite and azurite experimental: coordinate with another team in the lab room. Copper will combine with chlorine to form a compound called copper chloride in this lab you will separate the copper from the compound by a chemical reaction with aluminum in order to determine the mass of copper produced from this you will determine the percentage and the number of moles of copper and chlorine to. Brass is a generic term for a range of copper - zinc alloys there is no calculation necessary or possible to determine the copper content as there are many compositions of brass additionally there are : leaded brasses, copper +zinc+ lead, an. Will determine the percentage of copper in 1p pieces using titrimetric analysis the determination takes place in three stages: stage 1 a weighed coin is dissolved in concentrated nitric acid this forms a solution of copper(ii) ions stage 2 the solution of cu 2+ ions is treated with aqueous potassium iodide copper(i) iodide.
Free essay: determining the percent copper and zinc in pennies from density purpose: practicing determine the density of the solution developing the method. You don't necessarily want to calculate the volume of the penny that has already been done you want to find out what the percentage of copper and zinc are in the new penny which has a mass of 2500 g whatever part of the new penny which isn't copper must be zinc so, if x is the percentage of copper,. In this experiment, the water of crystallisation is removed from hydrated copper(ii) sulfate the mass of water is found by weighing before and after heating this information is used to find x in the formula: cuso4xh2o.
Including: atomic percent, atomic percentage, weight percent, weight percentage with regard to phase diagrams, percentages are used to show the relative proportions of elements in an alloy the percentage is not shown for the first element, but is shown for subsequent elements in the alloy, for example cu- 27wt%al is. Percentage % element by mass to calculate the composition of a compound and other % composition calculations calculate the % of copper in copper sulphate , cuso4 relative atomic masses: cu = 64, s = 32 and o = 16 relative formula mass = 64 + 32 + (4x16) = 160 only one copper atom of relative atomic mass 64.
It can be used to determine the concentration of either a single chemical species in solution or even the concentration of a species within a mixture of species in solution for example, it can be used to determine the mass percent of copper in brass shell casings collected by the crime scene investigator (csi), and then match. Graph or the equation for the line to determine the unknown concentration and type it into the box below concentration in the determine unknown concentration table percent copper in brass nitric acid is severely corrosive if it gets on your skin rinse it with large amounts of water the reaction of nitric acid and brass. A block weighing about 12,860 kg (almost 28,300 pounds, or over 14 tons) the copper ore forms only 07% of the rock we need to find a number that we can multiply by 007 to get 90 kg dividing 90 kg by 007 will give us that number— approximately 12,860 kg multiplying that number by 22 pounds/kg would give us the.
I am a student and i got an assignment form school to find out the percentage of zinc and copper in penny i am asked to find the measurements from 2 new pennies and one old so far i measured old penny from 1974 is 3150g before i did the experiment where i add the hcl to it the new penny from 2001 is 2600g before.
Answer to determine the percentage of vacancies in copper at 800◦c the energy for vacancy formation is 09ev/atom. The atom economy of a reaction can be calculated using the following equation: atom economy = mass of atoms in product/mass of atoms in reactant x 100 for example, the thermal decomposition of copper carbonate, with the desired product being copper oxide and waste product being carbon dioxide is shown like this. Other examples of hydrates are: lithium perchlorate trihydrate - liclo4 h2o magnesium carbonate pentahydrate - mgco3 h2o copper(ii) sulfate when determining the formula mass for a hydrate, the waters of hydration must be included example: calculate the percent error from the previous examples percent. Most copper ores contain only a small percentage of copper metal bound up within valuable ore minerals the remainder of the ore is simply unwanted rock exploration companies conduct drill programs to extract samples of rock called cores the cores are then subjected to chemical assays to determine.