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Questão 1
Questão
How do distinguish one element from another?
Responda
-
Number of atoms
-
Number of electrons
-
Number of portons
-
All of the above
Questão 2
Questão
Which of these is NOT a homogeneous mixture?
Responda
-
Solution
-
Suspension
-
Colloid
Questão 3
Questão
A mixture ___ a chemical combining of substances.
Responda
-
is
-
is not
Questão 4
Questão
In a compound, the ____ are ____ combined.
Responda
-
atoms, chemically
-
atoms, physically
-
molecules, physically
-
molecules, chemically
Questão 5
Questão
Elements that make up the compound ____ their identities and ____ take on a new set of properties.
Responda
-
retain, do
-
retain, don't
-
lose, don't
-
lose, do
Questão 6
Questão
The smallest identifiable unit of an element is a(n) ____.
Responda
-
proton
-
atom
-
molecule
-
None of these
Questão 7
Questão
In a mixture, the substances involved _____ be separated by a simple physical process because the elements are ________.
Responda
-
can, physically combined
-
can, chemically combined
-
can not, chemically combined
-
can not, physically combined
Questão 8
Questão
In a mixture substances _____ their identities.
Responda
-
retain
-
lose
Questão 9
Questão
Which of these is not a heterogeneous mixture? (more than one)
Responda
-
raisin bread
-
dissolved sugar water
-
humans
-
tossed salad
Questão 10
Questão
Which of these is a mixture (others are pure substances)?
Responda
-
Hydrogen
-
Potassium
-
Neon
-
Sugar
-
An apple
-
Milk
Questão 11
Questão
What is absolute zero?
Responda
-
coldest possible temerature
-
highest possible temperature
Questão 12
Questão
The measurement with absolute zero is ____.
Responda
-
Kelvin
-
Fahrenheit
-
Celcius
Questão 13
Questão
The first element was _____ because it has the least amount of protons.
Responda
-
Helium
-
Oxygen
-
Hydrogen
-
Nitrogen
Questão 14
Questão
The two pure substances: _____ & ____.
Responda
-
Nuclear Fusion, Nuclear Fission
-
Compound, Element
-
Homogeneous, Heterogeneous
-
Solids, Liquids
Questão 15
Questão
Kool-Aid mix is mixed with water until it dissolves. Which of these is correct?
Responda
-
Solute = Water Solvent = Kool-Aid
-
Solute = Kool-Aid Solvent = Water
Questão 16
Questão
Stars burn out when they __________.
Responda
-
run out of oxygen
-
gain to much oxygen
-
run out of hydrogen
-
gain to much hydrogen
Questão 17
Questão
What is the "Universal Solvent"?
Responda
-
Salt
-
Hydrogen
-
Water
Questão 18
Questão
What are two chemical properties?
Responda
-
Elements, Compounds
-
Color change, Production of gas
-
Malleability, Hardness
-
None of these
Questão 19
Questão
What is the difference between endothermic and exothermic?
Responda
-
exothermic = heat taken in endothermic = heat released
-
exothermic = heat released endothermic = heat taken in
-
No difference
Questão 20
Questão
Three exothermic phase changes are?
Responda
-
Melting
-
Condensation
-
Deposition
-
Evaporating
-
Sublimation
-
Freezing
Questão 21
Questão
Three endothermic phase changes?
Responda
-
Freezing
-
Melting
-
Sublimation
-
Evaporating
-
Deposition
-
Condensation
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