Pure or Not
What is a mixture?
A mixture is 2 or more substances which are put together and do not chemically combine.
How is the periodic table arranged today?
By increasing atomic number.
What is the center of the atom called?
The nucleus.
This property just describes the atom.
Physical Property
Solid --> Liquid
Melting
What is the basic building block of matter?
The atom.
Give me 2 names for columns on the periodic table.
Groups or families.
Name the 2 subatomic particles found in the nucleus of the atom.
Solubility.
Physical, when something dissolves you can boil it to get the solid back.
Gas --> Liquid
Condensation
Name the 2 types of mixtures.
Homogeneous and heterogeneous.
Why don't some of the element's abbreviations match their names? For example Ag = Silver
They are named in the original language they were discovered.
Where is the electron found?
Outside the nucleus in an electron cloud.
Phase Change
Physical, it can be reversed.
3 Names for a liquid going to a gas.
Vaporization, evaporation, boiling.
Name the 2 types of pure substances.
Elements and compounds.
Define atomic number.
The number of protons in the nucleus of the atom.
Name the charges of the 3 subatomic particles.
Proton - positive
Electron - negative
Neutron - neutral
Flammability
Chemical, turns into something new.
What happens to temperature and state during a phase change?
Temperature stays the same while the state of matter is changing.
How is an element different from a compound?
An element is only made of 1 type of atom and a compound is 2 or more elements chemically combined.
What is the main similarity for elements in the same column?
The number of valence electrons.
Sequence the subatomic particles from largest to smallest.
Neutron, proton, electron.
What do you call a property that stays the same regardless of the size of the sample.
Characteristic Property
A solid straight to a gas.
Sublimation