0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Why not all metals emit colors in the flame test?
no not all metals produce a colour flame.
How do you heat a test tube with a Bunsen burner?
the advantage of a blue flame is that it is more effecient(hotter flame less flue). the flame is hotter than a yellow one and no soot is produced which blackens test tubes
How are electron excited in a flame test anylses?
In The name of God Introduction: Flame test is method to identify the element (metal ions) based on Emission spectrum. The test involve putting sample of Unknown element and see what color appears. Also Thermal excited electron goes from low to high energy level which raises the color but when the excitation ends electron gets to lower level which make the color back to normal. Then compare it to flame test result of former lab but after testing it with cobalt blue glass. Material: 1- Safety Goggles 2- 250 mL beaker 3- 500 mL beaker 4- Bunsen burner 5- Cobalt blue glass 6- Distilled water 7- Flame test wire 8- Dropper 9- Test plate with walls 10- Spectroscope 11- HCl solution 12- Unknown Solution Number 6 Procedure: 1- Small amount of HCl was added to small 250 mL beaker. 2- The Bunsen burner was lighted. 3- The flame test wire was dipped into the HCl for minute then heated by holding it in the Bunsen burner for another minute or until all the red color is gone. 4- The flame test wire was cooled and then rinsed with distilled water into 500 mL beaker. 5- Full drop of unknown solution # 6 was added to test plate. 6- The flame test wire was dipped into unknown # 6 Solutions. 7- Then the flame test wire was put to fire. 8- The procedure No. 3&4 were repeated to clean the flame test wire. 9- The flame test was dipped again in the Unknown solution # 6. 10- Blue Cobalt glass was used to test the color. 11- The flame test wire was put to fire while holding the blue cobalt glass. Soruces : My school Flame Test Lab for Pro.Jennifer Regards : Abdrahman Ali
Is a flame test a good way to identify an element?
Limitations:The nichrome wire may still have impurities after cleaning in the hydrochloric acid. This may have an affect on the colour of the flame. This in turn will have an affect on the results obtained, having an affect on the whole experiment.Another limitation is that the flame already burns red/orange so this may make it a judgement call of what colour the flame is. If this judgement is incorrect the results of the experiment will be affected.The test cannot differentiate between all elements. Several metals produce the same flame colour. Some compounds do not change the colour of the flame at all.Sodium is present in most compounds and will colour the flame. Sometimes a blue glass is used to filter out the yellow of sodium.The test cannot detect low concentrations of most ions.
What difficulties are there in a flame test?
ions in small concentration do not show up wire loop can become easily contaminated and make false results wire loop itself burns orange and may be interpreted wrongly the human perception of colour may influence results
Why not all metals emit colors in the flame test?
no not all metals produce a colour flame.
Why can you not use flame tests to identify all the elements?
1. not all elements give colour to the flame 2. flame test is not always accurate
What color flame test does sodium nitrate give?
All sodium salts will give a yellow flame test, because of the metal sodium in the compounds.
Which part of the flame is used to perform the flame test?
All but the very center bottom. The general color will change ie, green for Copper.
How do you heat a test tube with a Bunsen burner?
the advantage of a blue flame is that it is more effecient(hotter flame less flue). the flame is hotter than a yellow one and no soot is produced which blackens test tubes
What happens to lead nitrate in a flame test?
It depends on the conentration, did a test today with several nitrates (incl. lead nitrate) and they were all yellow/orange...
What are the limitations to a flame test?
· The test cannot detect low concentrations of most ions. · The brightness of the signal varies from one sample to another. For example, the yellow emission from sodium is much brighter than the red emission from the same amount of lithium. · Impurities or contaminants affect the test results. Sodium, in particular, is present in most compounds and will color the flame. Sometimes a blue glass is used to filter out the yellow of sodium. · The test cannot differentiate between all elements. Several metals produce the same flame color. Some compounds do not change the color of the flame at all. The flame test only works on certain molecules, more specifically the Alkali/Alkali Earth metals. It doesn't necessarily distinguish between compounds of these molecules neither.
What difficulties may be encountered in the use of the flame test for identification of metallic ion?
A difficulty that may be found in using the flame test is eye imperfection. Another is subjectivity when it comes to perceiving the colors.
How are electron excited in a flame test anylses?
In The name of God Introduction: Flame test is method to identify the element (metal ions) based on Emission spectrum. The test involve putting sample of Unknown element and see what color appears. Also Thermal excited electron goes from low to high energy level which raises the color but when the excitation ends electron gets to lower level which make the color back to normal. Then compare it to flame test result of former lab but after testing it with cobalt blue glass. Material: 1- Safety Goggles 2- 250 mL beaker 3- 500 mL beaker 4- Bunsen burner 5- Cobalt blue glass 6- Distilled water 7- Flame test wire 8- Dropper 9- Test plate with walls 10- Spectroscope 11- HCl solution 12- Unknown Solution Number 6 Procedure: 1- Small amount of HCl was added to small 250 mL beaker. 2- The Bunsen burner was lighted. 3- The flame test wire was dipped into the HCl for minute then heated by holding it in the Bunsen burner for another minute or until all the red color is gone. 4- The flame test wire was cooled and then rinsed with distilled water into 500 mL beaker. 5- Full drop of unknown solution # 6 was added to test plate. 6- The flame test wire was dipped into unknown # 6 Solutions. 7- Then the flame test wire was put to fire. 8- The procedure No. 3&4 were repeated to clean the flame test wire. 9- The flame test was dipped again in the Unknown solution # 6. 10- Blue Cobalt glass was used to test the color. 11- The flame test wire was put to fire while holding the blue cobalt glass. Soruces : My school Flame Test Lab for Pro.Jennifer Regards : Abdrahman Ali
Consistent temperature can be achieved while heating a test tube by doing what?
Consistent temperature can be achieved by heating a test tube while moving the test tube all around the flame. Do not let only one part of the test tube rest on a flame but instead, keep moving the test tube slowly.
What colour flame does sulfur burn with?
Iron is a sort of sparkly-black when it is burned.
Is a flame test a good way to identify an element?
Limitations:The nichrome wire may still have impurities after cleaning in the hydrochloric acid. This may have an affect on the colour of the flame. This in turn will have an affect on the results obtained, having an affect on the whole experiment.Another limitation is that the flame already burns red/orange so this may make it a judgement call of what colour the flame is. If this judgement is incorrect the results of the experiment will be affected.The test cannot differentiate between all elements. Several metals produce the same flame colour. Some compounds do not change the colour of the flame at all.Sodium is present in most compounds and will colour the flame. Sometimes a blue glass is used to filter out the yellow of sodium.The test cannot detect low concentrations of most ions.
