Presentation on theme: "Background for Glass Analysis Quiz Monday 10/03. Matter is anything that has mass and takes up space. – Mass: the number of particles in something, how."— Presentation transcript:
Matter is anything that has mass and takes up space. – Mass: the number of particles in something, how much there is of an object – Space: scientific word for “space” is volume, which describes the size of a substance. – Both of these variables can be observed and measured
We can measure mass using a triple beam balance or digital scale. Mass is measured in grams (SI Unit)
We can measure volume using a ruler or a graduated cylinder Volume can be measure in two ways: Volume of a regular solid (cube): L x W x H unit: cm 3
Density is defined as mass per unit of volume The formula for density is… density = mass volume
If the density of the object is greater than that of the fluid, the object will sink. If the density of the object is equal to that of the fluid, the object will neither sink or float (suspended) If the density of the object is less than that of the fluid, the object will float.
Amorphous solid Greek amorphos, from a- (without) + morph ē (form) Non-crystalline solid Can change shape with heating Heating at a range of temperatures- not a set temperature like a crystalline solid
Behaves more like liquids with high viscosities EX: honey, syrup, & gels
1. Physical Property: any property of an object that can be observed without changing it’s composition (without changing what the object or substance is made up of) EX: weight, volume, color, boiling or melting point, viscosity, brittleness, buoyancy, phase changes Matter is Classified into 2 groups
For the forensic scientist, the need to find and measure those properties that will associate one glass fragment with another--also minimizing or eliminating other sources. To compare glass fragments, a forensic scientist evaluates two important physical properties: density and refractive index.
Chemical Property: a characteristic of a substance that indicates whether it can undergo a certain chemical change Flammable Reaction to light Reaction to sound
Chemical Change: a change of one substance to another, an “unexpected” change Burning, fizzing, or popping (fireworks exploding) are helpful indicators that a new substance is produced.
Routine drug tests for cocaine or heroine- fast test before sending to lab for detailed analysis Uses a chemical reagent called Marquis reagent. Chemical reaction occurs turning the unknown sample various colors detecting the type of drug Can test for ecstasy, meth, aspirin, codeine, LSD, morphine
Ancient Greek philosophers suggested that earth, air, water, and fire as matters fundamental building blocks
Silica(SiO 2 ) is a common fundamental constituent of glass. Element or compound? FUN FACT: In nature, vitrification of quartz occurs when lightning strikes sand, forming hollow, branching root like structures called fulgurites. Transfer of a substance into glass