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Terms in this set (74)
characteristics that can be used to describe or identify matter
anything that has mass and takes up space
the study of matter and its changes
why do different forms of matter have different properties?
because they have different compositions
what word comes from the Latin word meaning "a putting together" or combining of parts into a whole?"
matter can be classified in how many different ways?
What is one classification system for matter?
a system based on what makes up the matter
Every sample of matter can be divided in what categories?
pure substances and mixtures
How can a compound be pure?
If two or more substances combine
a physical blend of pure substances
A mixture can be separated by what?
matter that always has exactly the same composition
pure substance or substance
Why does every sample of a given substance have the same properties?
because a substance has a fixed, uniform composition
substances are classified in what two categories?
elements and compounds
a substance that cannot be broken down into simpler substances
smallest particle of an element
no two elements contain the exact same type of ________.
what are symbols used to represent?
each symbol has how many letters?
one or two
the first letter in the symbol is always what?
the second letter in a symbol is never what?
the same element symbols are used _______but the name of the element can be _________.
a substance that is made of two or more simpler substances that can be broken down into those simpler substances
What can simpler substances be?
Elements or other compounds
how are substances combined?
the properties of a compound are different from what?
the substances from which it is made
a compound always contains what?
two or more elements joined in a fixed proportion
physical combinations of materials
a particular type of matter
mixtures tend to retain what?
the properties of their individual substances
what in a mixture can vary?
How can mixtures be classified?
By how well the parts of the mixture are distributed throughout the mixture
the parts of the mixture are noticeably different from one another in this mixture
the substances are so evenly distributed that us difficult to distinguish one substance in the mixture from another in this mixture; seems to contain only one substance
It's not always easy to do what with a homogeneous and a heterogeneous mixture?
what does the size of the particles in a mixture have an effect on?
the properties of a mixture
a mixture can be classified as what based on the size of the largest particles?
solution, suspension, and collid
formed when substances dissolve and form a homogeneous mixture
a liquid in a solution; does the dissolving
what kind of solutions do not separate into layers over time?
Why can you see liquids pass through solutions?
light passes through them without being scattered in all directions
the particles in a solution are too small to __________, be trapped by a ___________, or scatter _________.
settle out,filter, light
a heterogeneous mixture that separates into layers over time
a suspension is anything that has to be _________, shaken, or _________.
mixed or stirred
suspensions can be filtered to separate the ___________.
why are suspensions cloudy?
they scatter light
the scattering of light by the particles of suspensions and colloids
any characteristic of a material that can be observed or measured without changing the composition of the substances in the material
the resistance of a liquid to flowing, the tendency of a liquid to keep flowing
The greater the viscosity, the ________________ a liquid flows.
viscosity of a liquid usually __________ when it is heated
a material's ability to allow heat or electricity to flow
the ability of a solid to be hammered without shattering
solids that shatter when struck are ________
to see which material will scratch the other; diamond is the hardest common material
The temp at which a substance changes from a solid to a liquid is its melting point
The ratio of the mass of a substance to its volume; can be used to test the purity of its volume
The temp at which a substance boils is
used to identify a material, to choose a material for a specific purpose, or to separate the substances in a mixture
mixtures can be separated by using a _________, evaporating any liquid ________, ______________, filtration and ____________.
magnet solvent chromatography distillation
separates the materials of a mixture by density
a process that separates materials based on the size of their particles
A process that separates the substances in a solution based on their boiling points
when some of the properties of a material change, but the substances in the material remain the same
any ability to produce a change in the composition of matter; can only be observed when the substances are changing into different substances
a material's ability to burn in the presence of oxygen
describes how readily a substance combines chemically with other substances
occurs when a substance reacts and forms one or more new substances
There are ______ common types of evidence for chemical change.
What are the three indicators of a chemical change?
a change of color, production of gas, and formation of a precipitate
any solid that forms and separates from a liquid mixture
What happens to the matter when it undergoes a chemical change?
The composition changes
What happens to the matter when it undergoes a physical change?
the composition remains the same
ratio of mass per unit volume
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