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Molecules Review
Test Description: Review for molecules
Instructions: Answer all questions to get your test result.
1) Scientists have identified about 100 different kinds of _____.
A
energy
B
rock
C
precipitation
D
atoms
2) The atomic weight of an atom is mostly the mass of its __________.
A
protons and neutrons
B
electrons
C
protons
D
protons and electrons
3) Compare a proton to a neutron
A
A proton has a positive charge while a neutron has no charge.
B
A proton is found in the nucleus while a neutron is found in a shell outside the nucleus.
C
proton has much more mass than a neutron.
D
A proton has a positive charge while a neutron has a negative charge.
4) ______ is matter made of one kind of atom.
A
An element
B
A proton
C
A molecule
D
A compound
5) The periodic table is organized by the properties of ______.
A
gases
B
elements
C
liquids
D
molecules
6) A molecule is:
A
a particle found in the nucleus of an atom.
B
two or more atoms that are chemically bonded.
C
two or more substances that are mixed together.
D
the smallest part of an element that still has the properties of that element.
7) The unaided human eye can view objects as small as 50 micrometers in diameter. Based on this information, what can be concluded about the size of molecules?
A
Molecules can be larger or smaller than 50 micrometers in diameter
B
Molecules are larger than 50 micrometers in diameter.
C
Molecules are smaller than 50 micrometers in diameter.
D
Molecules are 50 micrometers in diameter.
8) Why is it impossible to see molecules with the naked eye?
A
They are too big.
B
They are too small.
C
They move too fast.
D
They have no mass.
9) H2, O2, and N2 are all examples of ________.
A
diatomic molecules
B
ions
C
compounds
D
liquids
10) What are compounds? Compounds are ________.
A
chemical combinations of two or more elements
B
combinations of two or more minerals
C
combinations of two or more metals
D
physical combinations of two or more atoms
11) The shapes of _____________ are determined by the regularly repeating arrangement of its atoms.
A
atoms
B
crystals
C
hydroxide
D
hydronium ions
12) Pure sodium can cause burns. Pure chlorine can cause burns. When they combine into a molecule (NaCl) the new substance is _______________.
A
an explosive solid that must be handled carefully
B
a combination of gases that can be deadly
C
a solid crystal that is safe to touch
D
a neutral gas that is safe to breathe
13) At room temperature, oxygen is a gas and hydrogen is a gas. When they combine at room temperature, they form a _______________.
A
gas
B
liquid
C
solid
D
solution
14) Polymers are chains of molecules that ________________.
A
are found in only one shape
B
react only with other polymers
C
cannot be changed
D
can stretch forever
15) Which of the following would be made of a polymer with a low degree of elasticity?
A
rubber band
B
rubber ball
C
milk jug
D
basketball net
*select an answer for all questions
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