Describing Matter
a substance that cannot be broken down into any other substances by chemical or physical means
What is an element?
A mixture that separates into layers
suspension
has definite shape and indefinite volume
liquid
the basic particle from which all elements are made
What is an atom?
two or more substances that are together in the same place, but their atoms are not chemically bonded
What is a mixture?
has indefinite shape and indefinite volume
gas
a single kind of matter that always has a specific composition
What is a pure substance?
two or more elements combined
what is a compound?
a mixture in which you can usually see the different parts and they can easily be separated out
What is a heterogeneous mixture?
Gas to a solid
Deposition
combustion, electrolysis, oxidation, tarnishing are examples of a _____________ change
chemical
a characteristic of a substance that can be observed without changing into another substance
What is a physical property
a group of two or more atoms held together by chemical bonds
What is a molecule?
a mixture in which the substances are so evenly mixed that you can't see the different parts and they are difficult to separate
What is a homogeneous mixture?
Solid to a gas
sublimation
a solution like toothpaste, ketchup would be considered to have high ___________
viscosity
a characteristic of a substance that describes its ability t change into different substances
What is a chemical property?
Name three compounds we have used in our labs?
CaCl2 - road salt
NaHCO3 - Baking Soda
Sugar
What are the methods used to separate mixtures?
filtration, distillation
an object that allows heat and electricity to flow would be called a
conductor