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Topics What is glass Why glass breaks Chemically strengthened glass how it works make at home? Tempered glass Laminated glass Special types
(Regular) glass Used everywhere Main compounds: Silicon dioxide (SiO 2 ) Sodium oxide (Na 2 O Sodium carbonate (Na 2 CO 3 ) Brittle
Why glass breaks? Compression X Tension Microscopic defects
Chemically strengthened glass Regular glass bathed in salt(s) Sodium atoms -> potassium atoms Only thin surface is treated
Chemically strengthened glass Constant compression Higher force to break Flexible
Gorilla glass Commercial brand Smartphones, tablets… Patented chemical mix, process (temperatures) …
Try it at home? 2hours+ 400°C Molten KNO3 Strength increase: 3-4 times Youtube channel „Applied science“
Tempered glass Thermal process Surface rapidly cooled 6 times stronger Shatters into small pieces good/bad?
Laminated glass Glass+glue+glass Stays together Safety/security feature Skyscraper windows Windshields … Soud isolation
Fused quartz/silica glass No added ingredients – pure SiO 2 High temperature (2000°C) Halogen bulbs UV transparent Special applications
Sugar glass Easy to break Used in movies or food decorations Molten sugar+water+corn syrup
Questions? Every application needs another type Glass looks trivial but is it? Questions?
Chapter 4 Glass. Glass Fragments Glass that is broken and shattered into fragments and minute particles during a crime can be used to place a suspect.
Properties of Matter and the Analysis of Glass Types of Glass.
Test Friday!!! FORENSIC ANALYSIS OF GLASS. GLASS…AN AMORPHOUS SOLID Physical Properties: hard, elastic, brittle, non- conductor of electricity, density,
Chapter 6: The Structure of Matter. Section 1: Compounds and Molecules.
Chapter 4 Section 2, Part A Glass Analysis Pg
Noadswood Science, To understand and be able to represent ionic bonding Sunday, May 10, 2015.
Chapter 4 Glass. Properties of Matter Review Forensic scientists determine the properties that impart distinguishing characteristics: Physical Properties.
WHAT IS GLASS? Glass is the name given to any amorphous (non-crystalline) solid that displays a glass transitionnear its melting point. This is related.
Forensic Science Chapter 4: Properties of Matter and the Analysis of Glass.
Fractures a) Produced first b) Always form on the side of the glass opposite to where the impact originated c) Look like spider webs that spread outward.
Atoms Elements Molecules Compounds Pure Substance Mixture Solution.
GLASS EVIDENCE Glass is considered microscopic evidence.
Tempered glass is made by processes which create balanced internal stresses which give the glass strength. Tempered glass is manufactured through.
Ceramics Glass. Of the various glass families of commercial interest, most are based on silica, or silicon dioxide (SiO 2 ), a mineral that is found in.
Differentiate between a mixture and a compound.. Key concepts/skills: Level 1: Define key vocabulary. Level 2: Given a substance, differentiate between.
Chapter 4 Notes Part 2 Forensic Analysis of Glass.
Glass. Common Types 1.Fused silica 2.Soda lime (soft) 3.Borosilicate Main component is silicon dioxide (SiO 2 ) which is more commonly referred to as.
A hard substance made when heat is applied to sand, lime and metal oxides (usually sodium, calcium, magnesium, and aluminum) Silicon dioxide (SiO.
Windows and Glass. Question: Which window of a car can tolerate the larger stress before breaking? 1.The front windshield 2.The side window 3.They’re.
The structure of ionic compounds There are many ionic bonds (electrostatic forces) in an ionic compound such as sodium chloride, arranged in giant lattice.
Glass. Raw Materials Soda-lime-silicate which is made from –silica (sand) –Soda –Lime.
Introduction to Materials Science, Chapter 13, Applications and Processing of Ceramics University of Virginia, Dept. of Materials Science and Engineering.
Forensic Glass Analysis HC. terview/csi-of-glass-and- light-2?autoredirect#what- are-the-different-kinds-of- glass-studied-in-csi.
By: Rafal Grabowski CHEMISTRY. WHAT IS MATTER? Matter is it is any substance which has mass and occupies space. All physical objects are composed of matter,
Bell Ringer Bell Ringer 1. What is Sodium’s atomic mass? 2. How many protons does sodium have? 3. How many neutrons does sodium have?
A physical property describes the substance without reference to any other substance. Weight Volume Color Boiling Point Melting Point A.
Moles of Compounds. A properly written compound shows the ratio of atoms in the compound. For example, sodium carbonate (Na 2 CO 3 ) shows that for every.
Compounds and Molecules Chapter 6.1 Notes. Chemical Bonds A compound is made of two or more elements that are chemically combined Chemical bonds are the.
Compounds Chapter 3 Section 2. Compounds A pure substance created when two or more elements chemically combine(react) Ex: Magnesium + Oxygen Magnesium.
What is a Mineral? SWBAT define mineral; describe how minerals form; identify the most common elements in earth’s crust.
Glass By: Mario Popoli Augusto González. DefinitionPropertiesAdvantagesDisadvantagesHistoryUses Uses in architecture.
Many solids are crystals A solid in which the atoms are arranged in a regular pattern Sodium chloride.
Minerals 5.2 Composition and Structure of Minerals.
Unit 4 Review. 1. Define Compound A substance made by chemically combining two or more elements.
Glass Miss Jan. Page 46 practical 1. Cut glass – use file 2. “Melt” glass and smooth the end of the tube 3. Heat the middle of the tube, then put the.
Packaging Materials An overview. Main Packaging Materials Metals Paper and Board Glass Polymers This session will concentrate on the first three.
Elements, Compounds, and Mixtures. What are the basic differences? Element Any substance that contains only one kind of atom Cannot be broken down Compound.
~ As was mentioned earlier, when two or more elements come together chemically, you get a compound. But, there are often numbers attached to different.
Chapter 4 Section 1 Notes Compounds and Molecules.
Physical Properties of Glass & Soil. Glass Basics Glass is a hard, but brittle, amorphous solid composed of _________________ mixed with various compounds.
Grade 10 Science – Unit 2 – Chemistry – Chemical Bonding Classifying Chemicals Ionic ChargesChemical Formula Atomic Number and Atomic Mass Rates of Reaction.
What is the state of matter of glass at room temperature?
Glass analysis Distinguishing Glass Fragments. What is Glass? Glass is a is a hard, amorphous material made by melting sand, lime (also called calcium.
Elements and Compounds. Learning Target Today we will classify matter as Elements Elements Compounds Compounds Or mixtures Or mixtures.
The LeBlanc and Solvay Processes. Understand how stoichiometry and percentage yield are applied in Industry Understand the multi-step industrial processes.
AIM: What is a compound What is a compound? AIM: What is a compound Identify exactly how atoms combine together to form compounds.
Types of Solids. Solids Crystalline Solids- have a regular repeating arrangement of their particles. Salts, Sugars, Metals Amorphous Solids- have.
WHAT ARE ATOM AND ELEMENTS?. ATOMS AND ELEMENTS AN ATOM IS THE SMALLEST UNIT OF AN ELEMENT THAT STILL HAS THE SAME PROPERTIES OF THAT ELEMENT. AN ELEMENT.
DECEMBER 19, 2012 EQ: HOW IS GLASS ANALYZED TO SOLVE CRIMES? WARM-UP: (Write the questions & answer the questions while watch the following the video.)
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