is carbon dioxide and or hydrogen in a clean empty test tube
If a test tube is clean and dry, then there should be nothing in it.
You can test for oxygen by placing a glowing splint (not lit but not out) into the test tube where you think oxygen is present. If the splint relights, that means that it is oxygen. If this doesn't happen, then in your case it will be nitrogen.
You stated that carbon dioxide and nitrogen are present, but you did not mention oxygen. Nothing burns without oxygen . . . If you expose limewater to carbon dioxide, it will get cloudy, but will not if you expose it to nitrogen.
If a lit splint is placed in a test tube containing only nitrogen, the flame will extinguish quickly. This is because nitrogen is an inert gas and does not support combustion, as it lacks the necessary oxygen for the flame to continue burning. The absence of combustible materials and oxygen in the test tube prevents the splint from remaining lit.
One way to distinguish between nitrogen oxide and oxygen is by using a glowing splint test. When a glowing splint is introduced to a gas sample, oxygen will relight the splint due to its ability to support combustion, while nitrogen oxide will not. Additionally, nitrogen oxide can be detected using a brown ring test with iron(II) sulfate and sulfuric acid, where a brown ring forms at the junction of the two layers if nitrogen oxide is present.
The test for oxygen is to insert a glowing splint into a test tube and see if it glows brighter or re-ignites.
To test for nitrogen in a crisp packet, you can use a gas analyzer that detects nitrogen levels. Alternatively, you can perform a simple qualitative test by using a sample of the air inside the packet and comparing it to ambient air; the lower oxygen levels and higher nitrogen levels in the packet can indicate the presence of nitrogen. Another method involves chemical tests that react with nitrogen compounds, although these are less common for this specific application.
To remove oxygen from a test tube, one method is to displace it with an inert gas, such as nitrogen or argon. By flushing the test tube with the inert gas, the oxygen is pushed out. Another method is to create a vacuum inside the test tube to remove the oxygen. This can be done using a vacuum pump or a syringe to pull the air out of the tube.
Nitrogen dioxide and oxygen are released.
The CPK color convention for test tubes typically assigns carbon with the color black, oxygen with red, and nitrogen with blue.
Oxygen.... Thought it was Nitrogen, but ti's oxygen, got it wrong on test, right answer is oxygen.
No, in fact most early spacecraft the test animals, astronauts, or cosmonauts breathed pure oxygen. This was stopped after the Apollo-1 fire, which was attributed to defective wiring and a pure oxygen atmosphere. After that some nitrogen was added as a safety feature against fire.