What are chemical properties of evidence?
Evidence that a chemical change has occurred might include:
A color change. An odor change. Formation of a precipitate (you mix two liquids and make a solid) Gas is formed (bubbles)
What are physical and chemical properties forensic science?
Physical properties such as weight, volume, color, boiling point, and melting point describe a substance without reference to any other substance. • A chemical property describes the behavior of a substance when it reacts or combines with another substance. Forensic Science CC 30.07 Spring 2007 Prof.
Is odor a chemical property?
Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. are physical properties. Properties that describe how a substance changes identity to produce a new substance are chemical properties. … Physical and chemical properties can be used to classify a substance as ionic or molecular.
What are examples of chemical evidence?
Some types of evidence that fall into trace evidence and chemistry include: hairs, fibers, soil, glass, controlled substances/drugs, lubricants, inks/dyes/paints, explosives, and fire debris.
What are chemical properties of fingerprints?
Forensic scientists rely on four primary chemicals to reveal and collect fingerprints: iodine, cyanoacrylate, silver nitrate and ninhydrin. These chemicals react to substances within the fingerprint, such as oil and sweat, making the print change color so analysts can see it better.
What are chemical properties of hair?
The overall chemical composition of hair is 45 % carbon, 28 % oxygen, 15 % nitrogen, 7 % hydrogen and 5 % sulphur. The hair shaft is essentially composed of keratin. Hair keratin is hard, compact and strong. This fibrous protein is gradually formed inside cells from the germinal layer.
What are the chemical property of soil?
Soil chemical properties, including heavy metal concentrations, pH, total carbon, total nitrogen, CEC, exchangeable calcium (Ca), magnesium (Mg) and potassium (K), exchangeable Al and hydrogen (H) and available phosphorous (P), were determined following standard laboratory methods.
What do you mean by chemical property?
A chemical property describes the ability of a substance to undergo a specific chemical change. … Chemical properties are very useful in identifying substances. However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.