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Science-Ch. 3
Test Description: Atoms, Elements, and Matter-rest are repeats to be studied off previous test
Instructions: Answer all questions to get your test result.
1) A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is _____________.
A
30
B
52
C
26
D
56
2) In general, nonmetals are __________________.
A
malleable and ductile
B
good conductors of heat
C
good conductors of electricity
D
gases at room temperature
3) The millions of compounds that exist are made from approximately _____________elements.
A
150
B
115
C
75
D
50
4) Which of the following cannot be classified as matter?
A
an odorless, colorless gas
B
alpha particles
C
an electron cloud
D
the heat given off by a light bulb
5) How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2
A
four
B
one
C
two
D
three
6) Which of these statements about matter is NOT true?
A
Matter can be divided into pure substances and mixtures.
B
Matter is made up of atoms.
C
During chemical changes, matter is destroyed.
D
Matter has mass and takes up space.
7) _______________ has mass and takes up space.
A
Emotion
B
Air
C
Thought
D
Light
8) When two pure substances are combined so that each of the pure substances retains its own properties, the result is a (n)
A
isotope
B
element
C
compound
D
mixture
9) All _______________ except mercury are solids at room temperature.
A
nonmetals
B
mixtures
C
metalloids
D
metals
10) Most of the mass of an atom is found in its __________________.
A
electron cloud
B
mass number
C
atomic number
D
nucleus
11) When someone stirs cocoa powder into hot water or hot milk, the cocoa changes from a __________________.
A
homogeneous mixture into a compound
B
compound into a heterogeneous mixture
C
heterogeneous mixture into a homogeneous mixture
D
homogeneous mixture into a non-uniform mixture
12) In general, metals are ________________.
A
poor conductors of electricity
B
poor conductors of heat
C
good conductors of heat
D
brittle
13) When Rutherford performed his metal foil experiment, he was surprised that most of the alpha particles _______________.
A
passed straight through the foil
B
were deflected by the foil
C
were absorbed by the the foil
D
bounced back from the foil
14) Vegetable soup is an example of a ____________________.
A
compound
B
homogeneous mixture
C
heterogeneous mixture
D
pure substance
15) Matter that has the same composition and properties throughout is called a(n)
A
substance
B
mixture
C
atom
D
isotope
16) Water and hydrogen peroxide have different properties because ______________.
A
one is a compound and one is a mixture
B
they are made from different elements
C
only water follows the law of definite proportions
D
one contains a greater percentage of oxygen than the other
*select an answer for all questions
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