2. Density

3. Warm Up 9/29/2015 1.On the periodic table, what’s the difference between group 1 and group 17? 2.What is the name of the group on the periodic table that is used to kill germs or microorganisms? 3.Which group on the periodic table is not reactive? 4.What is an example of an alkali metal? 5.Chlorine has similar properties to which other elements? 6.How many electron shells does period 7 have? Group 1 are metals, group 17 are nonmetals Group 17, halogens Group 18 noble gases Potassium, sodium Cheetah and baboon Take out your homework…your paragraph on the element. Fluorine, bromine, iodine 7

5. Project is due October 13 th (A) and October 14 th (B)

6. Conclusion: 1.The density of water is 1.0g/mL. Why do you think your calculated density was not 1.0g/mL? 2.As volume of the liquid increased, what happened to the mass of the liquid? 3.What do you notice about the density as you change the volume? 4.What predictions can you make about the density of water if you use 100mL?

7. Density…18 Density Formula Unit mass per unit of volume Mass/Volume M/V g/mL g/cm 3

8. Mass Volume L x w x h mL cm 3

9. Density identifies a substance Density of a substance will always be the same regardless of size The density of a substance will usually be different from other substances

11. Density of Water1.0 g/mL

12. Layering of liquids the highest density will be on the bottom Lowest density will be on top

13. If sprite has a mass of 4 g and a volume of 3mL, what is its density? If alcohol has a mass of 5g and a volume of 10mL, what is the density?

14. Coke vs. Diet CokeDescribe: Explain:

15. Conclusion: 1.The density of water is 1.0g/mL. Why do you think your calculated density was not 1.0g/mL? 2.As volume of the liquid increased, what happened to the mass of the liquid? 3.What do you notice about the density as you change the volume? 4.What predictions can you make about the density of water if you use 100mL?

16. Density of 3 Liquids…19

17. Front of page 19 Density of 3 Liquids Purpose: To calculate the density of 3 liquids and hypothesize how the liquids will layer. Hypothesis: If the three layers were mixed, I think the ______________ will sink and the ____________ will float. Procedure: 1.Follow the procedure from the Density of Water Lab 2.Repeat procedure using alcohol, glycerine and vinegar

18. Alcohol = blue Vinegar = red Glycerine = yellow

20. Conclusion If you put all of the liquids in a container, color a picture of how they would be layered. On your illustration write the average density for each liquid. 1 paragraph- What did you learn from this lab? If water has a density of 1.0g/mL, which liquids will float in water? sink in water? What could have been some errors you made in the lab?