Chemistry – Sept 7, 2016 P3 Challenge – Convert 25 km/h to m/s

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Presentation transcript:

Chemistry – Sept 7, 2016 P3 Challenge – Convert 25 km/h to m/s Get out Factor Label Conversions Homework for check

Objectives and Agenda Objectives Agenda To practice unit conversions To calculate density To learn how to write a lab report Agenda Homework Review About Density Aluminum Foil Lab

Today’s Assignment What’s Due? (Pending assignments to complete.) Write your laboratory Report, Due Monday 9/12 What’s Next? (How to prepare for the next day) Begin Studying for the Unit 1 Test on 9/14

Density Density is a characteristic physical property of a substance and is sometimes used to identify a substance. Density is the mass of an item divided by its volume. This table lists the density of many common substances. Notice that solids have the highest density, and liquids usually have lower density. Gases have the lowest densities by far, usually reported in g/L.

Understanding density If density is color, a low density is a pale color, and a high density is a very intense color. If two objects have the same mass, the smaller one is more dense. If two objects are the same size, the heavier one is more dense. 1 kg 1 kg 1 kg 4 kg

Using the Density Formula List the known quantities with their units. Let their units help you decide which quantity a value represents. There must be two known quantities. Substitute these values into the formula. Calculate the third variable. Ex: A 1.68 kg object has a volume of 0.75 L. What is the density of this object in g/mL?

Exit Slip - Homework What is density? (formula and what the variables mean) What’s Due? (Pending assignments to complete.) Write your laboratory Report, Due Monday 9/12 What’s Next? (How to prepare for the next day) Begin Studying for the Unit 1 Test on 9/14