Density

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

Project is due October 13th (A) and

October 14th (B)

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?

Density…18Density

Formula

Unit

mass per unit of volume

Mass/VolumeM/V

g/mLg/cm3

Mass

VolumeL x w x h

mLcm3

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

http://goldprice.org/gold-jewellery/uploaded_images/gold-necklace-793229.jpg

Density of Water 1.0 g/mL

Layering of liquids • the highest density will be on the bottom• Lowest density will be on

top

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?

Coke vs. Diet Coke Describe:

Explain:

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?

Density of 3 Liquids…19

Front of page 19

Density of 3 LiquidsPurpose: 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 Lab2. Repeat procedure using alcohol, glycerine and vinegar

Alcohol = blueVinegar = red

Glycerine = yellow

ConclusionIf 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?