p hysical p roperty characteristics of matter that can be observed without changing the nature...
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PHYSICAL PROPERTYcharacteristics of matter that can be observed WITHOUT changing the nature (make-up) of the substance
PHYSICAL PROPERTIES
Density Color Conductivity Mass Malleability Ductility Viscosity
PHYSICAL PROPERTIES: COPPER
What are some physical properties of the copper strip?
How can we physically change the copper strip?
CHEMICALPROPERTYcharacteristics of matter that can be observed only when there is a change in the composition of a substance.
CHEMICAL PROPERTIES: COPPER
What do you notice about the second copper strip?
Is it still copper? Yes and no!
It is copper that has reacted with weak acids and is now covered with copper chloride and copper sulfate
Reactivity with an acid is a CHEMICAL PROPERTY.
In order to witness copper’s REACTIVITY WITH AN ACID, the chemical makeup of the copper had to be changed. No longer just a copper sheet!
DENSITYthe amount of matter (mass) in a given unit volume.
VISCOSITYViscosity refers to the resistance to flow of a fluid (“thickness”)
VISCOSITY VS. DENSITY?!
I have oil and water… How can I determine which is denser?
Does this mean that the water is also more viscous?
Let’s have a race! Two volunteers, 20 mL of each liquid, a funnel
and a flask will be needed to complete this race.
What is the difference between viscosity and density?
CHEMICAL CHANGE: the change of one or more substances into other substances.
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CHEMICAL PROPERTY: a property that can be observed only when there is a change in the composition of a substance.
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CHEMICAL REACTION: another term for chemical change.
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COMPOUND: a chemical combination of two or more different elements joined together in a fixed proportion.
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DENSITY: the amount of matter (mass) in a given unit volume.
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ELEMENT: a substance that cannot be broken down into simpler substances.
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MASS: the measure of the amount of matter an object contains.
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MATTER: anything that takes up space and has mass.
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MIXTURE: a combination of two or more substances in which the basic identity of each substance is not changed.
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PHYSICAL CHANGE: a change in matter where its identity does not change.
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PHYSICAL PROPERTY: a characteristic of matter that is exhibited without a change of identity.
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PROPERTY: the characteristics of matter; how it behaves.
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SOLUTION: a mixture that is the same throughout, or homogeneous.
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VOLATILE: description of a substance that easily changes to a gas at room temperature.
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VISCOSITY: the resistance of a liquid to flow (viscous).
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BUOYANCY: The tendency or capacity to remain afloat in A liquid or rise in air or gas; the upward force that A fluid exerts on an object less dense than itself.
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Students in a chemistry lab measure the time it takes four different 100 mL solutions to pass through a hole in the bottom of a cup. Which of the following properties of the solutions is most likely being measured? (Apr'06 10th -22) A. BuoyancyB. MassC. ViscosityD. Volume
ANS: C
The picture shows the results of pouring a blue liquid into a clear liquid and allowing the mixture to settle for 25 minutes. Compared to the clear liquid, the blue liquid is more _____. (Apr'06 11th -1) A. massiveB. denseC. viscousD. soluble
ANS: B
Today, the observation that an air bubble in water rises to the surface is explained by the principle of _____. (Fall'05 11th -19) A. viscosityB. buoyancyC. interferenceD. polarity
ANS: B
Brown sugar consists of crystals of white sugar coated with molasses. If brown sugar hardens, it can be softened by heating. The most likely reason brown sugar softens when heated is that heat _____. (Fall'05 11th -25) A. increases the moisture of sugarB. decreases the volume of molassesC. increases the density of sugarD. decreases the viscosity of molasses
ANS: D
As the viscosity of a liquid increases, the liquid _____. (Feb'06 11th -25 and Jul'06 11th -38) A. conducts electricityB. pours more slowlyC. evaporates more quicklyD. forms a precipitate
ANS: B
Swimmers find that they can float more easily in the ocean than in a freshwater pond. The most likely reason for this phenomenon is that the _____. A. viscosity of pond water is greater
than that of ocean waterB. density of ocean water is higher
than that of pond waterC. temperature of pond water is
lower than that of ocean waterD. mass of ocean water is greater
than that of pond water
ANS: B
The buoyant force that a fluid exerts on objects is increased when there is an increase in the fluid’s _____. (Jul'06 11th -25) A. acidityB. clarityC. solubilityD. density
ANS: D
According to this information, Block Z is most likely composed of _____.
A. balsaB. ebonyC. mapleD. poplar
ANS: A
A bar of soap produced by this soap-making process normally sinks to the bottom of a container of water. Which of these processes could cause the bar of soap to float in water? (Oct'05 11th -43)
A. Making grooves in the surface of the thick paste
B. Adding air bubbles to the thick paste
C. Letting the thick paste sit for four days
D. Chilling the mold filled with the thick paste
ANS: B