234405
Description
Quiz by Niat Habtemariam, updated more than 1 year ago
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Created by Selam H
over 10 years ago
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Copied by Niat Habtemariam
over 10 years ago
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Question 1
Question
How do distinguish one element from another?
Answer
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Number of atoms
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Number of electrons
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Number of portons
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All of the above
Question 2
Question
Which of these is NOT a homogeneous mixture?
Answer
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Solution
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Suspension
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Colloid
Question 3
Question
A mixture ___ a chemical combining of substances.
Answer
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is
-
is not
Question 4
Question
In a compound, the ____ are ____ combined.
Answer
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atoms, chemically
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atoms, physically
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molecules, physically
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molecules, chemically
Question 5
Question
Elements that make up the compound ____ their identities and ____ take on a new set of properties.
Answer
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retain, do
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retain, don't
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lose, don't
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lose, do
Question 6
Question
The smallest identifiable unit of an element is a(n) ____.
Answer
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proton
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atom
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molecule
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None of these
Question 7
Question
In a mixture, the substances involved _____ be separated by a simple physical process because the elements are ________.
Answer
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can, physically combined
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can, chemically combined
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can not, chemically combined
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can not, physically combined
Question 8
Question
In a mixture substances _____ their identities.
Answer
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retain
-
lose
Question 9
Question
Which of these is not a heterogeneous mixture? (more than one)
Answer
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raisin bread
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dissolved sugar water
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humans
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tossed salad
Question 10
Question
Which of these is a mixture (others are pure substances)?
Answer
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Hydrogen
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Potassium
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Neon
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Sugar
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An apple
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Milk
Question 11
Question
What is absolute zero?
Answer
-
coldest possible temerature
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highest possible temperature
Question 12
Question
The measurement with absolute zero is ____.
Answer
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Kelvin
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Fahrenheit
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Celcius
Question 13
Question
The first element was _____ because it has the least amount of protons.
Answer
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Helium
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Oxygen
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Hydrogen
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Nitrogen
Question 14
Question
The two pure substances: _____ & ____.
Answer
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Nuclear Fusion, Nuclear Fission
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Compound, Element
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Homogeneous, Heterogeneous
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Solids, Liquids
Question 15
Question
Kool-Aid mix is mixed with water until it dissolves. Which of these is correct?
Answer
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Solute = Water Solvent = Kool-Aid
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Solute = Kool-Aid Solvent = Water
Question 16
Question
Stars burn out when they __________.
Answer
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run out of oxygen
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gain to much oxygen
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run out of hydrogen
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gain to much hydrogen
Question 17
Question
What is the "Universal Solvent"?
Answer
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Salt
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Hydrogen
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Water
Question 18
Question
What are two chemical properties?
Answer
-
Elements, Compounds
-
Color change, Production of gas
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Malleability, Hardness
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None of these
Question 19
Question
What is the difference between endothermic and exothermic?
Answer
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exothermic = heat taken in endothermic = heat released
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exothermic = heat released endothermic = heat taken in
-
No difference
Question 20
Question
Three exothermic phase changes are?
Answer
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Melting
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Condensation
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Deposition
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Evaporating
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Sublimation
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Freezing
Question 21
Question
Three endothermic phase changes?
Answer
-
Freezing
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Melting
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Sublimation
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Evaporating
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Deposition
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Condensation
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