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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
rock
B
energy
C
precipitation
D
atoms
2) The atomic weight of an atom is mostly the mass of its __________.
A
protons
B
protons and electrons
C
protons and neutrons
D
electrons
3) Compare a proton to a neutron
A
proton has much more mass than a neutron.
B
A proton has a positive charge while a neutron has no charge.
C
A proton has a positive charge while a neutron has a negative charge.
D
A proton is found in the nucleus while a neutron is found in a shell outside the nucleus.
4) ______ is matter made of one kind of atom.
A
A compound
B
A molecule
C
An element
D
A proton
5) The periodic table is organized by the properties of ______.
A
gases
B
molecules
C
elements
D
liquids
6) A molecule is:
A
the smallest part of an element that still has the properties of that element.
B
two or more atoms that are chemically bonded.
C
two or more substances that are mixed together.
D
a particle found in the nucleus of an atom.
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 50 micrometers in diameter.
B
Molecules are smaller than 50 micrometers in diameter.
C
Molecules are larger than 50 micrometers in diameter.
D
Molecules can be larger or smaller than 50 micrometers in diameter
8) Why is it impossible to see molecules with the naked eye?
A
They have no mass.
B
They are too big.
C
They move too fast.
D
They are too small.
9) H2, O2, and N2 are all examples of ________.
A
diatomic molecules
B
compounds
C
ions
D
liquids
10) What are compounds? Compounds are ________.
A
combinations of two or more minerals
B
chemical combinations of two or more elements
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
a combination of gases that can be deadly
B
an explosive solid that must be handled carefully
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
solution
B
liquid
C
solid
D
gas
14) Polymers are chains of molecules that ________________.
A
cannot be changed
B
are found in only one shape
C
can stretch forever
D
react only with other polymers
15) Which of the following would be made of a polymer with a low degree of elasticity?
A
rubber ball
B
rubber band
C
milk jug
D
basketball net
*select an answer for all questions
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