Science chapter 2 Flashcards
pure substance
matter that always has exactly the same composition; an element or compound
atom
the smallest particle of an element
solution
a mixture that forms when substances dissolve and form a homogeneous mixture
physical property
Any characteristic of a material that can be observed or measured without changing the composition of the substances in the material
compound
A substance that is made from two or more simpler substances and can be broken down into the simpler substances
colloid
a mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in suspension
heterogeneous mixture
a type of mixture in which the parts of the mixture are noticeably different from one another
chemical property
any property that produces a change in the composition of matter
conductivity
a materials ability to allow heat or electric charges to flow
melting point
the temperature at which a substance changes from solid to liquid
malleability
the ability of a solid to be hammered without shattering
filtration
a process that separates materials based on the size of their particles
viscosity
the tendency of a liquid to keep from flowing; resistant to flowing
physical change
a change that occurs when some properties of a material change, but the substances in the material stay the same
reactivity
the property that describes how readily a substance combines chemically with other substances
precipitate
a solid that forms and separates from a liquid mixture
flammability
a materials ability to burn in the presence of oxygen
suspension
a heterogenous mixture that separates into layers over time
Boiling point
the temperature at which a substance boils; the temperature at which vapor pressure is equal to atmospheric pressure
element
a substance that cannot be broken down into simpler substances
distillation
a process that separates the substances in a solution based on their boiling point
chemical change
change that occurs when a substance reacts and forms one or more new substances
homogeneous mixture
a type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance from another
