Thursday, November 7 th, 2013 Characteristics of Matter.

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Presentation transcript:

Thursday, November 7 th, 2013 Characteristics of Matter

What is “effort aversion” What’s the “payout” for avoiding or minimizing effort? Meaning doesn’t lie in the work it lies in what you bring to the work!

Objectives To finalize our discussion of density by practicing density calculations and by using the terms:  Derived property  Physical Property  Characteristic Property To introduce solubility

Agenda Bell Ringer (density notes finalized) Review Density Laboratory Results Practice the Density Dilemma Calculations Introduce Solubility Mini-Quiz (1-point)  Density

Bell Ringer (write it out!) Density is a measure of how _________________ the material is in an object. It is a __________ property, because it doesn’t deal with the formation of new substances. It is a _________ property because you need to calculate it from two independent measurements (mass and volume) It is a _________ property because it can be used to identify the material and its measure is independent of the amount of material present. Tightly packed physical derived characteristic

Density Activity Results We’ve determined how to calculate the density of objects using the various laboratory apparatus and the equation D = m/V. In some cases we’ve needed to use a “special” method to determine the volume of irregularly shaped objects (called the __________ method) We’ve calculated the density of different types of:  Wood  Rubber  Metals We’ve determined that items made out of the same material will always have the same density, regardless of their shape or size (rubber stoppers). CHARACTERISTIC PROPERTY displacement

Density Dilemma Let’s spend a few moments reviewing the density dilemma questions.  Note… you will have a mini-quiz on these types of questions at the end of this class!

Other “characteristic” properties? Phase (state) change points  Melting, Freezing, Boiling, Condensing pH ALL chemical properties Solubility

Think About It… Is salt soluble in water?  YES!!! But could you dissolve all this salt with one drop of water? Certainly NOT!!! So there is a LIMIT to the amount of solute (salt) a given solvent (water) can dissolve

Solubility A measure of the amount of solute a that 100 grams of solvent can dissolve at a given temperature. Tomorrow we’ll have an activity testing the solubility of sucrose in water!

Density Mini-Quiz A sphere has a volume of 30mL and a density of 5g/mL. What will its mass be? A wooden block with a density of 0.8 g/cm 3 has a mass of 50 g. What will its volume be? Given: V = 30mL D = 5g/mL m = ? m = V x D m = 30mL x 5g/mL m = 150g Given: V = ? D = 0.8g/cm 3 m = 50g V = m/D V = 50g/0.8g/cm 3 V = 62.5cm 3