8.2 Compositon of Glass and Its Uses (2).pptx

this ppt describe about topic of composition and its uses

1. 8 : Manufactured Substances in Industry

2. Composition of Glass and Its Uses 8.2

3. Learning Standard 8.2.1 Describe briefly with examples the type of glass , their composition,properties and uses

4. 8.2 Composition of Glass and Its Uses Rainbow Skywalk in Georgetown, Penang is a bridge made of glass . Do you know of any other structures that are made from glass ? What about the method to make glass?

5. 8.2 Composition of Glass and Its Uses When silica is heated together with other chemicals, various types of glass with different properties are obtained. However, all types of glass have the same basic properties.

6. 8.2 Composition of Glass and Its Uses In this chapter, you will learn about four types of glass, which are fused silica glass, soda-lime glass, borosilicate glass and lead crystal glass. Types of Glass

7. 8.2 Composition of Glass and Its Uses Types of Glass

8. 8.2 Composition of Glass and Its Uses Types of Glass

9. 8.2 Composition of Glass and Its Uses Types of Glass

10. Quiz time!!!

11. W hat did you learn today?

12. Test Yourself 8.2 (page 262)

13. PREPARED BY: PUAN NOR SURAIYA AFIZA BINTI SALIM SMKPBP(1) THANKS Please keep this slide for attribution

14. Test Yourself 8.2 1. Silica is used to make all types of glass. ( a) State the type of glass that is made up of only silica . ( b) Soda-lime glass contains alkali metal ions. Name the ion . Fused silica glass Sodium ion

15. Test Yourself 8.2 2. A sample of borosilicate glass has composition of 80% silica, SiO 2 ,15% boron oxide, B 2 O 3 and 5% alumina, Al 2 O 3 . Calculate the mass of each component in the borosilicate glass sample with mass of 1 kg.

16. Test Yourself 8.2 3. Aini’s mother : Aini , do not store food in lead crystal glass containers. Aini : Why not, mother ? Based on the conversation above, explain the advantages and disadvantages of using containers made from lead crystal glass. Advantages: • The transparent property enables the food in the container to be visible • Can be easily cleaned and does not leave any traces • High heat resistance Disadvantages: • Heavy because lead glass has high density • Risk of lead poisoning, as lead can dissolve and diffuse into food