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What are common forensic techniques?
using aluminum powder or iodine to find fingerprints
What is the radioactive element of group 17?
Bromine (Br) is a liquid Iodine (I) is a solid
Is sublimation of iodine reversible or irreversible?
it is a physical change , sublimation is a transition of a substance from the solid phase to the gas phase without passing through an intermediate liquid phase. the iodine crystals when subject to heat turns to a violet gas , and when it cools it turns back to solid form. the composition doesn't change so it n is only a physical change
What is a good titile for my science project about are fingerprints inherited?
fingerprints
Is color a physical change?
Only if the color change is not permanent. Take Iodine for example (that's pronounced Eye-oh-deen), it is a solid metal that is grayish in color in its solid state, however in its gas state it's a purple or violet color. Once it reverts to its solid state, it turns gray again. This is a PHYSICAL property of Iodine. If the color changed permanently to something else, it would be a chemical change.
Why doesn't solid iodine stick to finger prints?
Solid iodine sublimes, meaning it transitions directly from a solid to a gas without becoming a liquid. This property makes it difficult for iodine to leave residue on fingers when touched, which is why it doesn't stick to fingerprints.
Why does solid iodine only stick to fingerprints when they are heated?
because when they are heated they are sticky and they only fix to fingers
Why can gas iodine stick to fingerprints?
The gas iodine will stick to the fingerprints because they will crystallize when they come into contact with a cool surface. When heated, iodine directly changes into vapor.
Explain why the solid iodine did not stick to the finger prints but it could when it was heated?
Solid iodine sublimes at room temperature, meaning it goes directly from a solid to a gas without melting. As a result, it does not stick to surfaces like fingerprints because it does not become liquid when in contact with the skin. When heated, the iodine turns into a gas, which can then interact with the oils and sweat in the fingerprint, making it visible.
Why does the solid iodine only stick to fingerprints when its heated?
because the iodine needs to make contact with the fingerprint so when it's a solid it can't do that. However when it is heated it turns in to gas (sublimation) it rises up and as it make contact with a coooler surface (the fingerprint) it crystallizes and makes it visable.
How do forensic scientists find fingerprints using iodine?
Forensic scientists use iodine fuming to detect latent fingerprints by sublimating solid iodine crystals, which react with oils and fats on the skin. The iodine forms a visible brown color on the fingerprint ridges, making them easier to visualize and collect as evidence.
Why does solid iodine not stick to fingerprint when heated?
When solid iodine is heated, it undergoes sublimation, transforming directly from a solid to a gas without passing through a liquid phase. This process allows the iodine molecules to bypass the solid-state bonding required to adhere to the fingerprint surface, resulting in a lack of sticking.
How does iodine show up the fingerprints?
dont now
Why does iodine work when using to find fingerprints?
probably because iodine sticks to the oil from your fingers
Is there a better technique than iodine to search for fingerprints?
It is simple
Is there a better substance then iodine to detect fingerprints?
no there is not a better substance
Is there a better method to finding fingerprints than iodine?
yes,yes there is
