Terms in this set (16) The difference between physical and chemical properties are that physical properties describe a substance without reference to another one but chemical shows a reaction when substances are combined.
What are chemical properties in forensic science?
Chemical properties are those that describe what happens when a substance reacts with another substance. For example, when the drug heroin comes into contact with the Marquis reagent chemical it turns purple. 5. What do forensic scientists do to collect and preserve soil samples?
What are physical properties in forensic science?
Physical properties are properties that can be measured without chang- ing the identity of the evidence. For example, when forensic scientists cal- culate the density of glass, they divide the mass of the glass by its volume. Measuring mass and volume does not affect the chemical makeup of the glass.
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. Nehru.
What are physical and chemical properties?
physical property: Any characteristic that can be determined without changing the substance’s chemical identity. chemical property: Any characteristic that can be determined only by changing a substance’s molecular structure.
What are physical and chemical properties give an example of each?
Physical properties are those that can be observed without changing the identity of the substance. The general properties of matter such as color, density, hardness, are examples of physical properties. … Flammability and corrosion/oxidation resistance are examples of chemical properties.
What physical properties do fingerprints have?
Dusting for fingerprints makes use of the physical property of stickiness. Skin oils absorb the fingerprint dust, which is then collected on a sticky tape.
What are the physical properties of blood?
Blood is a fluid that is technically considered a connective tissue. It is an extracellular matrix in which blood cells are suspended in plasma. It normally has a pH of about 7.4 and is slightly denser and more viscous than water.
What are the two most important physical properties of glass for forensic comparison?
what is the two most important physical properties of glass for forensic comparisons? the larger opening of a crater shaped hole in glass made by the penetration of a projectile indicates.. stress marks on the edge of a radial crack near the point of impact are..
What type of physical property is refraction an example of?
Examples of intensive properties include temperature, refractive index, density, and hardness of an object.
What are the 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 three physical properties of glass?
The main characteristics of glass are transparency, heat resistance, pressure and breakage resistance and chemical resistance.
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 5 examples of physical properties?
Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density.
Is color a physical or chemical property?
Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
What are the 10 physical properties?
Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.