Describing Matter
anything that takes up space and has mass
matter
a substance that cannot be broken down into any other substances by chemical or physical means
element
what classification are most of the elements? metal, nonmetal, or metalloid
metal
a change that alters the state or appearance of matter but does not turn any substance in the matter into a different substance with different properties
physical change
What are the electrons in the outer orbital called?
valence electrons
the basic particle from which all elements are made
atom
boiling, filtration, sublimation, evaporation are what type of changes?
physical changes
Where on a periodic table are nonmetals?
upper right
What type of change is burning something?
Chemical
a single kind of matter that is pure, meaning it always has a specific makeup, or composition
pure substance
when we classify matter by what it is made of
composition
a mixture in which you can usually see the different parts and they can easily be separated out
heterogeneous mixture
Group of gasses which are non reactive
noble (inert) gasses
combustion, rusting, gas production are examples of what type of change?
chemical change
a characteristic of a substance that can be observed without changing into another substance
a physical property
a group of two or more atoms held together by chemical bonds
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
homogeneous mixture
What are some properties of metals
luster, high melting and boiling points, malleable, ductile, good conductors
What about the valence electrons of metals in metallic bonds allows them to conduct electricity so well?
They detach from their parent atoms and become a sea of valence electrons
a characteristic of a substance that describes its ability to change into different substances
a chemical property
a substance made of two or more elements that are chemically combined in a set ratio
compound
What element in the center of a star causes a supernova to occur?
iron
Are all metalloids semiconductors (such as Silicon)
no
Coffee is what type of mixture
Homogeneous