week2 science 7.pptx quarter 1 science model

week 2 science 7 quarter 1

1. Classroom Rules: L isten to your teacher. Raise your hand to speak.  Be kind. Listen and follow directions. Respect everyone. Work hard and do your best .

2. . • Pure Substances • Kinetic Molecular Theory of Matter

3. . 1. What are atoms made of? 2. What does the particle model tell us about matter?

4. 1. Imagine tiny particles representing atoms or molecules. On your paper , draw these "partying particles." 2. Use arrows on your cards to show the movement of the particles. Represent "cold" particles with slow, short arrows on one side of the card while "hot" particles with fast, long arrows.

5. Particles are constantly moving (even in solids!), there are spaces between particles, and the speed of particle motion increases with temperature.

6. pure substances can be illustrated using a conceptual model.

7. • TICELPAR • ONITMO • SUFNOIDIF • PERATREMTEU • CAEPS

8. EOIYVLCT • TRACATITRON • SEHPA • NEREGY • ILUQID

9. DLIOS • OELEUCLM • ORCESF • NIBOILG TNIOP • SOILUBITLY

10. As the temperature rises, the higher the particle velocity and the greater the space occupied by      the particles. Substances generally expand as the temperature rises. Conversely, substances generally contract when cooled. How does particle motion relate to temperature?

11. ·  They affect the strength of forces between particles. ·  In gases, there are large spaces between particles. ·  In liquids, particles are closer together. ·  The concept of small voids between particles is relevant for solubility in other substances.   Why are spaces between particles important?

12. Elements is a substance that cannot be separated into simpler substance by chemical change Compounds are pure substances composed of two or more different elements

13. Pairwork: Which shows an element/compound? Situation A : Consider tearing a piece of tissue paper. Tissue paper is made from smaller building blocks like cellulose fibers. These fibers are themselves made of carbon, hydrogen, and oxygen atoms linked together in a specific way. Ripping the tissue separates these complex fibers, not individual atoms. Situation B: Imagine tearing a sheet of aluminum foil. Aluminum foil is mostly made up of a single element called aluminum (Al). When you rip it, you're separating tiny pieces of aluminum, each still being aluminum.

14. What generalization can you make for elements and compounds? How can you easily distinguish them?

15. The following is a list of substances. Group them into elements and compounds. Baking Soda Vinega r Sugar Shiny Coi n Graphite (Pencil Lead) Aluminum Foil Diamond Stainless Steel Sulfur Powder Table Salt ELEMENT sulfur powder Shiny coin aluminum foil Diamond COMPOUNDS Table Salt Baking Soda Sugar Stainless steel Vinegar

16. Formula Chemical Name Common Name NACCHO 3 Sodium hydrogen carbonate Sodium bicarbonate Baking Soda NaClO Sodium Hypochlorite Bleach (Liquid) H 2 O 2 Hydrogen Peroxide Agua Oxgenada KHC 4 H 4 O 6 Potassium Hydrogen Tartrate Cream of tatar MgSO 4 .7H 2 O Magnesium Sulfate Heptahydrate Epsom Salt CCl 2 F 2 Dichloroflouromethane Freon CaSO 4 .2H 2 O Calcium Sulfate Dihydrate Gypsum CH 3 COC 2 H 5 Ethyl Methyl Ketone Acetone FeS 2 Iron Sulfide Iron Pyrite (Fool’s Gold)

17. (CH 3 ) 2 CHOH Isopropyl Alcohol Rubbing Alcohol SiO 2 Silicon Dioxide Silicon Dioxide Quartz NaCl Sodium Chloride Table Salt C 12 H 22 O 11 Sucrose Table Sugar