When your substance either; change color, start to smell, explode, form bubbles, precipitate, and/or get hotter or colder.
The physical science unit of criminal investigation applies principles and techniques of chemistry, physics, and geology to the identification and comparison of crime scene evidence.
<h3>What is forensics in criminal investigation?</h3>
Forensics science is any of several fields of study involving the collection of physical evidence and its subsequent analysis.
The aim is to use of science and technology in the investigation and establishment of facts or evidence in a court of law.
There are several units involved in forensics science such as the following;
- Biology unit
- Physical science unit
The physical unit of forensics is the unit that applies principles & techniques on chemistry, physics and geology, which are physical science fields, to identify and compare crime scene evidence.
Learn more about forensics at: brainly.com/question/14403044
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From the periodic table:
mass of hydrogen = 1 grams
mass of oxygen = 16 grams
mass of carbon = 12 grams
This means that:
mass of one mole of aspirin = 9(12) + 8(1) + 4(16) = 180 grams
number of moles can be calculated using the following rule:
number of moles = mass / molar mass
number of moles = 0.4 / 180 = 2.223 x 10^-3 moles
The first one is correct because one mole of oxygen is half of 2O2 so it is half of the energy
it absorbs because the negative sign indicates energy taken inside
hope this helps
