How do distinguish one element from another?
Number of atoms
Number of electrons
Number of portons
All of the above
Which of these is NOT a homogeneous mixture?
A mixture ___ a chemical combining of substances.
In a compound, the ____ are ____ combined.
Elements that make up the compound ____ their identities and ____ take on a new set of properties.
The smallest identifiable unit of an element is a(n) ____.
None of these
In a mixture, the substances involved _____ be separated by a simple physical process because the elements are ________.
can, physically combined
can, chemically combined
can not, chemically combined
can not, physically combined
In a mixture substances _____ their identities.
Which of these is not a heterogeneous mixture? (more than one)
dissolved sugar water
Which of these is a mixture (others are pure substances)?
What is absolute zero?
coldest possible temerature
highest possible temperature
The measurement with absolute zero is ____.
The first element was _____ because it has the least amount of protons.
The two pure substances: _____ & ____.
Nuclear Fusion, Nuclear Fission
Kool-Aid mix is mixed with water until it dissolves. Which of these is correct?
Solute = Water Solvent = Kool-Aid
Solute = Kool-Aid Solvent = Water
Stars burn out when they __________.
run out of oxygen
gain to much oxygen
run out of hydrogen
gain to much hydrogen
What is the "Universal Solvent"?
What are two chemical properties?
Color change, Production of gas
What is the difference between endothermic and exothermic?
exothermic = heat taken in endothermic = heat released
exothermic = heat released endothermic = heat taken in
Three exothermic phase changes are?
Three endothermic phase changes?