1. Dimensional Analysis and Density

2. Warm - Up
Which side of a ruler should you use to measure – English or metric? Why?
How many decimals places past the decimal point can you read a ruler?
How do you read a graduated cylinder?
How many decimal places can be in your measurement of a graduated cylinder?
How many decimal places can be in your measurement of a beaker or a flask?
In general, what is an acceptable percent error for a lab?

3. Objective Today I will be able to:
Apply dimensional analysis to real – life situations
Calculate density be completing a lab

4. Homework
Study for metric system/ dimensional analysis and accuracy and precision quiz
Dimensional analysis practice

5. Agenda Warm – Up Density Notes Density Lab
Baking and Dimensional Analysis Scenario
Exit ticket

6. Density

7. Density Mass – quantity of matter a body possess (constant)
Weight – force of attraction of the earth for a body (gravitational attraction) (variable)

8. Introduction Matter occupies space, and therefore, has volume
Density = mass/volume
- Units are g/ml (liquids) and g/cm3 (solids)

9. What is Density?
Density reveals how tightly the molecules composing the matter are packed and how heavy the molecules are
Compared to the liquid they are in, less dense materials float, more dense sink
Substances are often IDed by their density, as it is rare for two substances to have the same density

10. Density and States of Matter
Solids – composed of tightly packed molecules, low kinetic energy, high density (Iron)

11. Density and States of Matter
Liquids – more loosely packed than solids, density less than solids (water)

12. Density and States of Matter
Gases – molecules are all over the place, density less than solids and liquids (air)

13. Calculating Density Remember, Density = mass/volume
Mass is determined using a scale
Volume is calculated several different ways

14. Finding Volume
To find the volume of a liquid, use a graduated cylinder
Make sure to read the bottom of the meniscus

15. Finding Volume Length x Width x Height
Volume of a regular object, such as a wooden block

16. Finding Volume Water Displacement Method
- Read the initial volume of water in a graduated cylinder
- Place object into cylinder
- Read the final volume of water
- Final – Initial = Volume of the object

17. Exit Ticket
Which has a greater mass, 6.00 g of lead or 7.00 g of styrofoam?
Which occupies a greater volume, 5.00 cm3 of lead or cm3 of styrofoam?
Which occupies a greater volume, 5.00 g of lead or 5.00 g of styrofoam?
Which occupies a greater volume, 9.00 g of lead or 50.0 g of styrofoam?
Which occupies a greater volume, 50.0 g of lead or 9.00 g of styrofoam?
Styrofoam, neither, styrofoam, styrofoam, can’t tell