1. Purpose: The purpose of this experiment is to demonstrate a cycle of reactions involving copper . A specific quantity of copper will be transformed through a series of reactions and then recovered as solid copper. A percent recovery will be calculated and sources of loss (or gain) will be identified.
Who discovered the copper cycle?
Although various copper tools and decorative items dating back as early as 9000 BCE have been discovered, archaeological evidence suggests that it was the early Mesopotamians who, around 5000 to 6000 years ago, were the first to fully harness the ability to extract and work with copper.
How does the copper cycle work?
In the first reaction, copper metal is oxidized by nitric acid to form copper (II) nitrate, Cu(NO3)2. It is then converted to copper (II) hydroxide, Cu(OH)2, by reaction with base. When this compound is heated, it is transformed to copper (II) oxide, CuO.
What principle of chemistry is the copper cycle?
The copper cycle is a demonstration of what principle of chemistry? Mass is conserved in chemical reactions .
What is the purpose of heating the copper II hydroxide in step 3?
As a result, hydroxide ion can displace water from the copper (II) ion, yielding copper hydroxide, Cu(OH) 2 , a blue precipitate. Heating copper hydroxide produces copper oxide, CuO, a black solid . Copper oxide dissolves in acid, regenerating the copper (II) ion, which once again binds to water.
What else can the copper react with quizlet?
Redox reaction: Copper reacts with nitric acid . Nitric acid oxidizes copper metal to the copper (II) ion. Nitric Acid- a toxic gas that has a copper color. Acid-Base Neutralization: Copper Nitrate is treated with Sodium Hydroxide.
What type of reaction is copper?
The reactions between copper and nitric acid are examples of oxidation-reduction reactions , where gaining electrons reduces one element and losing them oxidizes the other.
Where is copper commonly found?
The largest copper mine is found in Utah (Bingham Canyon). Other major mines are found in Arizona, Michigan, New Mexico and Montana. In South America, Chile, the world’s largest producer, and Peru are both major producers of copper.
How can you tell real copper from fake?
Identifying Real Copper: Look at Your Item
Real copper should have a reddish-brown hue, like a penny . Brass items tend to have a yellowish tint. If your item is yellow, orange-yellow or even has elements of gray, you are probably dealing with brass.
Why is copper a CU?
The name derives from the Latin cuprum for Cyprus , the island where the Romans first obtained copper. The symbol Cu also comes from the Latin cuprum. ... From the Latin word cuprum, from the island of Cyprus. It is believed that copper has been mined for 5,000 years.
Why is copper oxide added in excess?
Copper oxide and copper carbonate are insoluble , so usually you add an excess (more than enough to react with all the acid) then filter the mixture. The excess solid stays in the filter paper as a residue. ... This can be warmed to evaporate the water, leaving copper sulfate crystals behind.
Is copper reactive with water?
Metals such as lead, copper, silver and gold do not react with water at all .
Why is Cuo black?
Heated copper metal reacts with oxygen to form the black copper oxide . The copper oxide can then react with the hydrogen gas to form the copper metal and water. When the funnel is removed from the hydrogen stream, the copper was still be warm enough to be oxidized by the air again.
What type of reaction is Cu no3 2 NaOH?
Cu(NO 3) 2 (aq) + 2 NaOH (aq) → Cu(OH) 2 (s) + 2 NaNO 3 (aq) This is a precipitation reaction : Cu(OH) 2 is the formed precipitate.
What is the purpose of stirring the copper hydroxide precipitate solution while heating it?
If a reaction has not occurred after 5 minutes, turn up the heat. NOTE: This reaction should be carried out in a well-ventilated area (preferably a hood). NOTE: Stirring is essential to prevent bumping of the mixture and thus loss of CuO .
