1. Bellwork 1-6-16 Predict what will happen when 3 pennies are placed in vinegar for 24 hours. What type of change will occur? (physical or chemical)

2. Changing Change The teacher will place a folded paper towel in a small pie pan.The teacher will place a folded paper towel in a small pie pan. Pour vinegar into the pie pan until the entire paper towel is damp.Pour vinegar into the pie pan until the entire paper towel is damp. Place Three shiny pennies on top of the paper towel.Place Three shiny pennies on top of the paper towel. Put the pie pan in a safe place.Put the pie pan in a safe place. Wait 24 hours.Wait 24 hours.

3. Objectives Do I recognize that all matter consists of atoms? SPI 0807.9.1Do I recognize that all matter consists of atoms? SPI 0807.9.1 How can I compare the particles in a solid, liquid, and gas? SPI0807.9.6How can I compare the particles in a solid, liquid, and gas? SPI0807.9.6 Can I calculate the density of an object given its mass and volume? SPI 0807.9.7Can I calculate the density of an object given its mass and volume? SPI 0807.9.7 TOC:TOC: #. Density triangle#. Density triangle #. Chapter 7 notes#. Chapter 7 notes #. Density Problems #1#. Density Problems #1

4. #. Density TRIANGLE Write this in your SNB m D v Density: the amount of matter (mass) in a given amount of space (volume) Units: g/mL g/cm3 Volume: the amount of space an object takes up Units: kL, L, mL km3, m3, cm3 Mass: the amount of matter in an object Units: kg, g, mg

5. #. Chapter 7 notes #. Chapter 7 notes Identify six examples of physical properties of matter. Physical properties of matter can be observed without changing the identity of the matter. 1. Density - the amount of matter in a given space, or volume. 2. Solubility – the ability of a substance to dissolve in another. 3. Ductility – the ability of a substance to be pulled into a wire 4. Malleability – the ability of a substance to be rolled or pounded into thin sheets 5. State – physical forms of matter 6. Thermal conductivity –transferred heat

6. Describe how density is used to identify substances. To find an object’s density (D), first measure its mass (m) and volume (v). Then use the following equation: D = m/v Explain what happens to matter during a physical change. A physical change affects one or more physical properties of matter. (the identity doesn’t change) Examples of different physical changes: melting ice, cutting your hair, sanding wood, crushing a can, mixing oil and vinegar

7. Describe two chemical properties. Chemical properties describe a substance based on its ability to change into a new substance with different properties. Chemical properties include: Flammability – ability to burn Reactivity with water, acid, and oxygen causing a change in the identity of a substance Chemical properties can only be observed when a chemical change takes place.

8. Explain what happens during a chemical change. A chemical change occurs when one or more substances are changed into new substances with different properties. Clues to chemical changes: fizzing and foaming, color change, production of heat, light, sound or odor

9. Distinguish between physical and chemical changes. Physical changes can be reversible by physical means. Chemical changes cannot be undone by physical means.

10. #. Density Problems #1 Answer the items on the Density Problems #1 Worksheet.Answer the items on the Density Problems #1 Worksheet.

11. Density Problems # 1 Answers 1. Which square is the densest? Why? 2. Which square is the densest? Why

12. Density Problems # 1 Answers 3. What is density? The amount of matter (mass) in a given space (volume) 4. What is the formula for Density? D = m / v 5. What are the units for Density? g/mL or g/cm 3 6. Why are these units for density? The units represent the equation that you are working-difference between mass and volume.

13. Density Problems # 1 Answers 7. Frank has a paper clip. It has a mass of 9g and a volume of 3cm 3. What is its density? 9 g ∕ 3 cm 3 = 3 g/cm 3 8. Frank also has an eraser. It has a mass of 3g, and a volume of 1cm 3. What is its density? 3 g ∕ 1 cm 3 = 3 g/cm 3 9. Jack has a rock. The rock has a mass of 6g and a volume of 3cm 3. What is the density of the rock? 6 g ∕ 3 cm 3 = 2 g/cm 3

14. Density Problems # 1 Answers 10. Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm 3. What is the density of the rock? 8 g ∕ 2 cm 3 = 4 g/cm 3 11. Alicia has a watch. It has a mass of 4g and a volume of 2cm 3. What is the density of the watch? 4 g ∕ 2 cm 3 = 2 g/cm 3 12. Mia has a wallet. It has a mass of 15g and a volume of 5cm 3. What is the density of the wallet? 15 g ∕ 5 cm 3 = 3 g/cm 3

15. Density Problems # 1 Answers 13. Which layer has the highest density? 4 14. Which layer has the lowest density? 1 15. Imagine that the liquids have the following densities: Which number would go with which layer? 4 10g/cm 3 2 5g/cm 3 1 3g/cm 3 3 6g/cm 3

16. Density Problems # 1 Answers 16. Which liquid has the highest density? 3 – syrup 17. Which liquid has the lowest density? 1 – oil 18. Which liquid has the middle density? 2 – water

17. Density Problems # 1 Answers Liquid Layers – Check out picture 3: 19. Imagine that the liquids on the right have the following densities: Which number would go with which layer? 6 15g/cm 3 2 7g/cm 3 1 3g/cm 3 4 10g/cm 3 5 12g/cm 3 3 9g/cm 3

18. Density Problems # 1 Answers 20. What is the formula for density? D = m / v 21. What are the units for density? g/mL or g/cm 3 22. What happens if you pour together liquids that have different densities? They will separate into layers with the least dense on top and most dense on the bottom

19. Density Problems # 1 Answers 23. Will the liquid on the top have the highest or lowest density? Lowest 24. Will the liquid on the bottom have the highest or lowest density? Highest

20. Density Problems # 1 Answers 25. Jake has a book, a ruler, and a balance. How can Jake find the density of the book with the tools he has? (Hint: Explain HOW you use EACH tool for your answer to be correct!) Jake would find the volume of the book using the ruler, than he would multiply the L x W x H in cm 3. Jake would find the mass of the book by measuring it on the balance in g. Lastly, Jake would find the density by D = m / v in g/cm 3.

21. Exit Ticket Does a display of fireworks represent a physical or chemical change? Does a display of fireworks represent a physical or chemical change?