Table of Contents
What are the chemical evidences?
Chemical evidence can be any chemicals found on people, various objects, or in solutions, generated as part of a crime and recovered at the scene or a related locations.
Why are 4 types of evidence that a chemical reaction occurs?
Q2. Describe four types of evidence of a chemical reaction. A color change, formation of a precipitate or a gas, or temperature changes are the evidences of a chemical reaction. Change the concentration, surface area or temperature of reactants, or add a catalyst in order to change the rate of reaction.
What are some chemical reactions examples?
Examples of chemical reactions in everyday life include photosynthesis, rust, baking, digestion, combustion, chemical batteries, fermentation, and washing with soap and water. Chemical reactions occur everywhere in the world around you, not just in a chemistry lab.
What are 5 evidences of a chemical reaction?
The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change. Challenge: food cooking, rust formation, tarnish forming on doorknobs, fuel burning for heat, tarnished penny.
What are some 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 is evidence for chemical change?
Common evidences of a chemical change include a change of color, odor, temperature, the formation of a gas, or a precipitate A physical change occurs when there is a change in physical properties of a substance but not chemical compostion.
What are the types of reaction?
The main four types of reactions are direct combination, analysis reaction, single displacement, and double displacement. If you’re asked the five main types of reactions, it is these four and then either acid-base or redox (depending who you ask). Keep in mind, a specific chemical reaction may fall into more than one category.
What is the definition of chemical evidence?
Chemical evidence is any residue from liquids that could have been used to assist with the crime such as poison and drugs, finally biological evidence is when hair or skin from a persons body has been transferred to a physical surface and then be collected and tested.