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