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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
precipitation
C
rock
D
atoms
2) The atomic weight of an atom is mostly the mass of its __________.
A
protons and neutrons
B
protons
C
protons and electrons
D
electrons
3) Compare a proton to a neutron
A
A proton is found in the nucleus while a neutron is found in a shell outside the nucleus.
B
A proton has a positive charge while a neutron has a negative charge.
C
proton has much more mass than a neutron.
D
A proton has a positive charge while a neutron has no charge.
4) ______ is matter made of one kind of atom.
A
An element
B
A molecule
C
A proton
D
A compound
5) The periodic table is organized by the properties of ______.
A
molecules
B
liquids
C
elements
D
gases
6) A molecule is:
A
two or more atoms that are chemically bonded.
B
a particle found in the nucleus of an atom.
C
the smallest part of an element that still has the properties of that element.
D
two or more substances that are mixed together.
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 are smaller than 50 micrometers in diameter.
B
Molecules are larger than 50 micrometers in diameter.
C
Molecules can be larger or 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 have no mass.
C
They are too small.
D
They move too fast.
9) H2, O2, and N2 are all examples of ________.
A
ions
B
liquids
C
compounds
D
diatomic molecules
10) What are compounds? Compounds are ________.
A
chemical combinations of two or more elements
B
combinations of two or more metals
C
combinations of two or more minerals
D
physical combinations of two or more atoms
11) The shapes of _____________ are determined by the regularly repeating arrangement of its atoms.
A
hydronium ions
B
atoms
C
crystals
D
hydroxide
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 neutral gas that is safe to breathe
C
a solid crystal that is safe to touch
D
a combination of gases that can be deadly
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
solid
C
solution
D
liquid
14) Polymers are chains of molecules that ________________.
A
can stretch forever
B
cannot be changed
C
react only with other polymers
D
are found in only one shape
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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