Ch. 13 Essay Questions & Chapter Review
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A piece of paper is folded into a paper airplane. How does the mass of the unfolded paper compare with the mass of the paper airplane? Explain
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They are the same. The mass of an object does not depend on the object's shape. A piece of paper has the same mass no matter how it's shaped. [ex, flat, airplane, fancy boat, etc]
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The density of water is 1g/cm3. The density of oak wood is .68 g/cm3. Will the oak wood sink or float in water? Explain?
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The oak wood would float b/c it's density is less than the waters density.
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The statue of Liberty is made of copper metal. Over years of being exposed to air, the surface changes from a shiny copper to a green patina. Is this a physical or chemical change? Explain.
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Chemical change. Air [oxygen], combines with copper metal and oxidizes creating/causing a chemical change [making green, no longer shiny].
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Matter can be found in any of the 4 states. >Identify the four states of matter. >Compare the shape and volume of substances in each state. >Describe the arrangement motion of particles in each state of matter.
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>Solid-Definite shape/volume.Particles are very close together, don't move very fast. >Liquid-No definite shape/definite volume.Move fast enough to move past each other. Slide past each other. Gas-No definite shape or volume. Move in many different directions. Move fast. Plasma-No definite shape or volume.Electric charges, conduct electricity.
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During a _____, a substance mixes with another substance and changes into completely new substances with different properties
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chemical change
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The measure of the mass per unit volume of a substance is its _____
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Density
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A ____ tells how a substance forms new substances when it mixes with something else.
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chemical property
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The change of state from a gas to a liquid is called ______
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condensation
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An object's _______ is the amount of space that it takes up.
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...Mass
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A _____ can be seen or measured without changing the substance into something else.
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physical property
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An object's ______ is the amount of matter that makes up that object.
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...volume
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During a _____, the appearance of a substance changes but its properties stay the same.
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physical change
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The measure of the pull of gravity on an object is its ______
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...weight
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How does plasma differ from gases?
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... Plasma can conduct electricity but gases can not
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For each change below, decide if it is a physical change or a chemical change. Then tell how you know. Chopping wood chocolate melting a candle burning a nail rusting
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a.physical. b.physical c.chemical d.chemical a&b, properties stay the same c&d, properties change and new substances w/diff properties form
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When it goes through a chemical change, a substance changes:
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into another substance
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All of the following are physical properties of a substance EXCEPT: its form at a given temp its density its boiling point its flammability
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flammability
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Chemical properties describe how a substance changes when it: reacts w/another substance changes into a different state changes into a different state of matter adds or loses mass gains or loses energy
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reacts with another substance
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Even if you change the mass of a substance, the substance will always have the same: weight volume pull from gravity density
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... density
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Density
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a measure of the amount of matter in a given space
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Weight
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a measure of the pull of gravity on an object
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Chemical Properties
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properties that tell how a substance form new substances when it mixes with something else
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Volume
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the amount of space that something takes up
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Physical Properties
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properties that can be seen or measured without changing the substance into something else
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Mass
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the amount of matter that makes up an object
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A substance whose matter is more tightly packed than another substance has a greater _____
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density
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The shape of an object is an example of the object's _____ properties
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physical
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What has a greater mass, 1 liter of water or 1 liter of gasoline? The density of gasoline is approximately 0.68g/ml
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The density of water has a greater mass
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What will sink/float when put in sea water which has density of 1.025 g/ml a.Gasoline .66 g/ml b.mercury 13.6 g/ml c.asphalt 1.2 g/ml d.cork 0.26 g/ml
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a.float b.sink c.sink d.float
