Properties of Matter

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# Properties of Matter - PowerPoint PPT Presentation

Properties of Matter. Background for Glass Analysis Quiz Monday 10/03. What is Matter?. Matter is anything that has mass and takes up space . Mass: the number of particles in something, how much there is of an object

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### Properties of Matter

Background for Glass Analysis

Quiz Monday 10/03

What is Matter?
• 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
Measuring Mass

We can measure mass using a triple beam balance or digital scale.

Mass is measured in grams (SI Unit)

Measuring Volume
• 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: cm3
Measuring Volume
• Volume of a irregular solid (rock):
Density

Density is defined as mass per unit of volume

The formula for density is…

density = mass

volume

Density…Sink or Float??

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.

States of Matter

LIQUID

GAS

SOL ID

• radiation from the sun, light from a fluorescent light, stars
What state of matter is Glass?
• Amorphous solid
• Greek amorphos, from a- (without) + morphē (form)
• Non-crystalline solid
• Can change shape with heating
• Heating at a range of temperatures- not a set temperature like a crystalline solid
Glass
• Behaves more like liquids with high viscosities
• EX: honey, syrup, & gels

Matter is Classified into 2 groups

• 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

Importance of Physical Properties

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:densityandrefractive index.

Properties of Matter:Chemical Properties
• 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 Changes
• 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.
Crime Lab Uses

Can test for ecstasy, meth, aspirin, codeine, LSD, morphine

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

Nature of Matter

Ancient Greek philosophers suggested that earth, air, water, and fire as matters fundamental building blocks

Basic Chemistry Terms
• Atom =

basic unit of matter

Substances
• Elements: Substance in which all atoms in a sample are alike
• Compounds: substance made of two or more atoms (two or more elements)

Water:

Hydrogen and Oxygen

Salt:

Sodium and Chlorine

Molecules

Compounds