1. Objective 4.04: Describe the suitability of materials for use in technological design: Electrical conductivity Density Magnetism Solubility Malleability

2. Physical Property Property—any factor that can be used identify and describe matter Helps for deciding the uses of various materials for technology Physical property—observable and measureable characteristic without changing the identity of the substance Ex Mass, volume, color, hardness, and phase Every substance has its own unique properties

3. Chemical Property Chemical property—how the matter will change under certain conditions, this characteristic is unique to substances Ability to burn, rust, react to light, or react with acids are chemical properties of matter Open the link below to check your understanding of physical vs. chemical properties…click on Run The Module to get it started http://vital.cs.ohiou.edu/?page_id=161

4. Review from Yesterday Zigzag line divides the table into metalloids, metals, and nonmetals

5. Malleable and Ductile Malleable—able to be hammered and shaped and rolled into thin sheets like foil Ductile—able to be stretched or drawn into wires without breaking www.alibaba.com tiwires.com

6. Magnetism Magnetism—attraction(moving towards) or repulsion (moving away) between like or unlike poles—iron, cobalt, and nickel are strong magnets www.ohiomagnetics.co m

7. Electricity and Heat Conductor—a material or substance electricity or heat easily flows through Insulators—a material that electricity or heat doesn’t easily flow through—rubber, wood, plastic, glass Semiconductor—a material that has conductive properties that are variable—these can be useful for carrying electricity under certain conditions

8. Density Density—density=mass/volume certain substances have a specific density www.stevespanglerscience.co m

9. Solubility Solubility—measure of how much of a substance can dissolve in a certain amount of another substance Carbon dioxide will dissolve more in water than oxygen, that’s why it is used in sodas www.chem.ufl.edu

10. On page 12 in your notebook Write the heading Discussion Questions Answer discussion questions 1-4, which can be located in your notes…. If you don’t have your notes then find the Chemistry Unit Notes located on my website under the chemistry tab

11. Identify substances based on characteristic physical properties: Density Boiling/Melting points Solubility Chemical reactivity Specific heat

12. Temperature Temperature is a physical property Temperature that a substance melts or boils is specific for the that substance

13. Temperature Review Melting Point Boiling Point Melting point—the temperature at which a solid changes into a liquid i.e water 0  C Recall the melting point for your element Boiling point—the temperature at which a liquid changes into a gas i.e. water 100  C Recall the boiling point for your element http://www.harcourtschool.com/activity/hotplate /index.html

14. Specific Heat Specific heat—the amount of heat needed to raise 1 gram (1 g) of a substance by 1 degree Celsius The unit of specific heat is joules per gram per degree Celsius (J/g   C) Used to compare how different substances absorb heat

15. Specific Heat Which of the following has the lowest specific heat? Which of the following has the highest specific heat? SubstanceSpecific Heat (J/g   C) Water (liquid)4.18 Ethanol2.44 Water (solid)2.06 Aluminum0.897 Lead0.129