• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# The idea of the experiment is to determine which equation is correct. There are 2 equations of CuCo3 and I have to find out which gases are given off when CuCo3 is given off.

Extracts from this document...

Introduction

INTRODUCTION : The idea of the experiment is to determine which equation is correct. There are 2 equations of CuCo3 and I have to find out which gases are given off when CuCo3 is given off. The two equations are 1.2CuCo3(s) Cu2O +2CO2 +0.5O2 2.CuCO(s) CuO +CO2(g) I am going to heat the CuCO3 check the colour when it is heated, measure the volume of the gas given off and test whether it is oxygen or carbon dioxide by introducing a glowing splint. Background theory: Copper (ii) trioxocarbonate (IV), CuCo3, only exists as basic salts and occurs naturally as malachite (CuCO3.Cu(OH)2) and azurite Cu(OH)2CuCO3. The basic trioxocarbonate (IV) of copper,CuCO3.Cu(OH)2 is precipitated when NaCO3 is added to any copper (II) salt solution. It is blue green, insoluble solid and decomposes into copper (II) and carbon (IV) oxide on heating. It is also attacked by dilute acids to produce carbon (IV) oxide. Copper is a transition element. Copper is an essential component of several enzymes and is also used in electric wiring and �CuO(Copper (II) oxide): It is commonly known as black copper oxide and is obtained by heating in this case CuCO3 or heating the metal in oxygen. Copper (II) oxide is a hydroscopic black solid which is insoluble in water. It is a basic oxide forming copper (II) salts with acids. It decomposes above 1000�C into copper (I) ...read more.

Middle

Ca (OH) 2 +CO2(g) �CaCO3(s) + H2O(l) Variables, which apply. The independent variable is the cupric carbonate (CuCO3). The dependent variables are the oxides and the gases given off. The quantity of CuCO3 was measured with a weighting scale in a weighing bottle. Calculations: Equation 1 2CuCO3(s) �Cu2O(s) + 2CO(g) +0.5O2(g) Equation 2 CuCO3(s) �CuO(s) +CO2(g) 1 mole of gas contains 22.4dm3 Range of quantities measured for equation 2: CuCO3�CuO + CO2(g) 1). 1.5g of CUCO3. No of mol = 1.5\124 =0.012096774mol Mass of CuO produced =76 x0.012096774=0.919354824g of CuO 0.012096774 :0. 012096774mol The Independent variable is the cupric carbonate (CuCO3), which is measured with a weighting balance. The dependent variables are the mass of CuO and the volume of CO2 given off. A gas syringe was used to measure the volume of the CO2 given off while a balance was used to measure the residue copper oxide. To keep the independent variable constant, use the same amount for all your experiments. The same boiling tube should be used all throughout the experiments so that the volume of air in the tube will be the same for all the experiments. Preliminary Study: Equipment: Bunsen burner, cupric carbonate, litmus paper, gas syringe, boiling tube, wire gauze, safety goggles, lab coat, glowing splint, weighting beam, spatula, clamp and stand, rubber tube, tongs. Method: 1. 0.5g of CuCo2 was measured on a weighting scale and put in a boiling tube. ...read more.

Conclusion

I used a gas syringe to measure the volume of gas in the tube to give me a good degree of accuracy. 5. I clamped the boiling tube down with a clamp stand to make it steady so I can read accurately, the volume of gas given off. 6. I heated the boiling tube containing CuCO3 over a Bunsen burner to decompose the CuCO3 and to see what colour it changes to. This will help to determine which equation is correct. 7. After heating the chemical, which turned black. I read off the volume of gas collected. 8. I tested the gas with a glowing splint. The gas is supposed to rekindle the splint but it didn't. 9. I also tested gas with damp litmus paper. . 10. I tried to dissolve the residue by adding water to it. It didn't dissolve which also confirms that the residue is CuO because CuO is insoluble in water. Results 1. The volume of gas collected in the gas syringe is 80cm3.i expected a volume of 90cm3. 2. The copper carbonate turned black after heating. This confirms that CuO is the residue. 3. When I tested the gas with litmus paper. The litmus paper turned pink from blue which confirms that the gas is CO2 4. A glowing splint. The glowing splint didn't re ignite. When I tested the gas with a glowing splint. This shows that the gas isn't oxygen hence not equation 1. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level War Poetry section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

## Here's what a teacher thought of this essay

5 star(s)

There is a lot of information in this assignment. It sometimes could do with organising and subtitling to lead the reader through the different sections, but it's a good and thorough piece of work.

There are things that could be improved,; particularly the use of terminology - anatomy and physiology is full of terms that should be applied.

5 stars

Marked by teacher Lindsay Taverner 02/05/2012

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level War Poetry essays

1. ## The causes of world war one

4 star(s)

the problem was that they lacked the technology to extract and process them. They were a population that were divided by culture and population barriers (much like the Austro-Hungarians). France France had the ability to be a the most major power in the world, at the turn of the century.

2. ## This paper describes a design-based effort to build an effective closed-system air standard gas ...

Most of the work produced in the turbine is used to run the compressor and the rest is available to run auxiliary equipment and produce power. The gas turbine is used in a wide range of applications. The thermal efficiency is important because it gives the fraction of the heat

1. ## The diffusion of Ammonia Gas

Diagram 4 cm 8 cm 12 cm 16 cm 20 cm 0� 2 18 42 83 121 30� 2 20 47 87 144 60� 2 32 54 92 198 90� 2 28 55 136 243 120� 2 30 58 135 240 150� 2 30 58 135 236 180� 3 28

2. ## World war one short story coursework.

"In the frontline." I dropped the letter, and my head hung low. I looked at the frozen bodies, and yet he still babbled on. He nodded to me, and walked off, hugging himself to keep him warm. I stood stunned.

1. ## Comparing and Contrasting Gas Exchange in Humans, Protozoa and Plants.

Gas exchange occurs in the lungs, a pair of organs encased by the rib cage. As in protozoa and plant systems, human lungs have high surface area to volume ratios to allow maximum exchange of gases (diffusion can occur across the whole surface of protozoa and plants have thin leaves, which have high surface area to volume ratio.)

2. ## Determination of the Value of the Gas Constant and the Molar Volume of Oxygen ...

OBSERVATIONS DURING HEATING VOLUME (cm3) |ERROR| (cm3) 0 *Before Heating 0.0 ? 0.5 15 KMnO4(s) begins to blacken; black substance cumulates on underside of cotton wool and up sides of tube 11.0 ? 0.5 30 Continues to blacken; substance is of metallic sheen and cumulates quite heavily in cotton wool 42.0 ?

1. ## The Lost Generation in The Sun Also Rises

Jake Barnes is the semi-pious Catholic. Although Jake is deemed one of the "more religious" characters in the novel, his attitude towards religion and the Catholic faith in general show that the War affects him in this way too. Once again it is his relationship with Brett that causes his religious hopelessness.

2. ## 'It is sweet and meet to die for your country' To what extent do ...

'All in the valley of Death, Rode the six hundred', which implies that they were not afraid and were putting on a brave face as they rode. But the repetition throughout the poem emphasizes the hardship they went through and also the fact that they were riding to their inevitable deaths.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to