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25 Cards in this Set

  • Front
  • Back
Atoms in molecular compounds share _________.
All of a ___________ mixture has the same composition.
When an atom loses an electron, it's a _________ ion.
What is ductile?
The ability to be pulled into wires.
What does it mean to conduct electricity?
It means that the element will allow a flow of electrons.
Protons in a nucleus are held together by ____________ force.
nuclear strong
1. malleable
2. conducts heat and electricity
3. ductile
1. liquid at room temp
2. silvery
3. poisonous gas
Ionic compounds tend to be ___________.
Molecular compounds tend to be _______.
liquids and gases
Zinc 64 and Zinc 66 are different ________.
Atoms of the same element that have different #s of neutrons
Structure of atom
Protons (positive) and neutrons (neutral)in the nucleus and electrons (negative) are in surrounding electron cloud on energy levels.
Atomic #
. # on protons in the atom
. indentifies the atom
Carbon 14
. found in all living things and is used to date organic artifacts
. C14 decays into C12 which is more stable
. measure the ratio of C14 to C12 to dtermine the age of sample
Mass #
. total # of protons and neutrons
. aren't whole #s because they're averages based on isotopes
Atomic Mass Unit
. based on Carbon atom
. 1/2 the mass of Carbon atom
an atom of group of atoms that gains of loses an electron`
a substance made of 2 or more elements, chemical combined
Molecular Compounds
particle held together by sharing of electrons
Ionic Compound
charged particle formed when an atom of group of atoms gains or loses an electron
when 2 or more substances are not chemically compbined, but are mixed together physically
All parts contain the same amount of each component
ex: grape juice, chocolate milk, alloy
Not all parts of mixture contain same amount of each component
ex: salt and pepper, seasoning mix, raisen bran cereal
Compouds vs. Mixtures
. Compounds don't vary in composition, mixtures do
. Compounds chemically combine, mixtures don't
. Compounds don't keep it's element's original properties, mixtures do
. Compounds can only be seperated chemically, mixtures can be seperated physically