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jfindley
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What are physical properties?
can be observed without chemically changing matter
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What are chemical properties?
describe how a substance interacts with other substances
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What type of property is malleability?
psychical
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What type of property is density?
physical
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What type of property is color?
physical
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What type of property is shape?
physical
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What type of property texture?
physical
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What type of property is mass?
physical
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What type of property is ductility?
physical
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What type of property is conductivity?
physical
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What type of property is solubility?
physical
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What type of property is re activity?
chemical
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What type of property is combustability?
chemical
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What type of property is flammability?
chemical
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What type of property is acidity?
chemical
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What type of property is the ability to rust?
chemical
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What is a physical change?
no change in identity of substance
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What is a chemical change?
one or more new substances is created
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What is the density of water?
1.0
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What is the freezing point of water?
0 degrees celcius
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What is the boiling point of water?
100 Celsius
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When does liquid turn to solid?
freezing point
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When does solid turn to liquid?
melting point
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What two points are the same?
melting and freezing
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When does liquid turn to gas?
boiling point
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When does gas turn to liquid?
Condensation point
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When does solid turn to gas?
sublimation point
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What type of change is acid rain?
chemical
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What is the law of conservation of mass?
mass cant be created or destroyed
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What is an Element?
pure substance made of one kind of atom
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What is and element represented by?
one or two letter symbol
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What is a compound?
two or more elements chemically combined
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What are compounds represented by?
chemical formula
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What proportions do compounds combine in?
the same proportions
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What is a mixture?
two or more substances physically combined
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What proportions do mixtures combine in?
not the same proportions
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What is a heterogeneous mixture?
not uniform
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What are homogeneous mixtures
uniform
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What is an alloy?
solution of two or more metals
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What is hydrogen peroxide?
coumpound
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What is carbon dioxide?
compound
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How can the components of a mixture be separated with physical properties?
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What is centrifuge?
an instrument that uses density to separate mixtures when tiny solid particles are dissolved in water
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What is used to separate liquids and solids?
filtration
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What is used to separate solutions
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An object will float in water if?
its density is less than 1.0
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An object will sink in water if?
its density is greater than 1.0
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What is the formula for density?
mass divided by volume
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What are intensive physical properties?
- remain the same no matter how of of the substance you have
- ex density
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What are extensive physical properties?
- depend on the amount of substance present
- ex- mass, volume, length
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What is suspension?
- heterogeneous mixtures
- particles will settle out over time
- particles are large
- can be separated by fileration
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What are colloids?
- homogeneous mixtures
- medium sized particles
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What is the Tyndall effect?
scattering of light by a colloid
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What are examples of suspensions?
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What are examples of colloids?
- milk
- blood
- smoke
- clouds
- mayonnaise
- marshmellows
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What are Solutions?
- constant composition that is uniform throughout
- small particles
- can be solid (alloy), liquid, or gas
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What is a solute?
gets dissolved
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What is solvent?
does the dissolving
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What is filtration?
technique that uses a porous barrier to separate a solid from a liquid
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What is distillation?
separation based on differences in the boiling points of substances involved
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What is crystallization?
separation resulting in the formation of pure solid particles of a substance from a solution
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What is Chromatography?
separates the components of a mixture on the tendency of each to travel or be drawn across the surface of another material
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