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Molecules
Test Description: Molecules Review
Instructions: Answer all questions to get your test result.
1) When an atom loses electrons in a chemical bond, the atom is called ________.
A
an electrolyte
B
an ion
C
an element
2) The atomic number is the number of _____________ in the nucleus of an atom.
A
neutrons
B
protons
C
electrons
3) Suppose a neutral atom were to lose an electron. What would happen to the atom?
A
It would become positively charged.
B
It would become negatively charged.
C
It would remain neutral.
4) Which part of the atom is so small it contributes very little to the mass of an atom?
A
electron
B
neutron
C
proton
5) Where are the electrons in an atom found?
A
in the nucleus
B
orbiting the nucleus
C
both inside and outside of the nucleus
6) The atomic mass of an element ________.
A
is the combined mass of its protons
B
is the combined mass of its electrons, neutrons, and protons
C
is the combined mass of its protons and electrons
7) Atoms are made of protons, neutrons, and ______.
A
electrons
B
molecules
C
elements
8) Which particles are in the nucleus of an atom?
A
protons and electrons
B
protons and neutrons
C
protons, neutrons, and electrons
9) ______ is matter made of one kind of atom.
A
A molecule
B
A proton
C
An element
10) The vertical columns in the periodic table are known as:
A
groups.
B
periods.
C
valences.
11) Why is the periodic table so useful to scientists?
A
It contains the recipes for a variety of different kinds of mixtures.
B
It can be used to predict how elements react.
C
It reminds them what the elements look like.
12) The halogens are:
A
inert gases.
B
very reactive nonmetals.
C
very reactive metals.
13) Which element listed below is a nonmetal?
A
chlorine (Cl)
B
sodium (Na)
C
magnesium (Mg)
14) Which statement best summarizes the development of the periodic table of elements over time?
A
Scientists found errors in Mendeleev’s table and removed certain elements.
B
Scientists reorganized and named the groups on Mendeleev’s table.
C
Scientists discovered other elements and added them into Mendeleev’s table.
15) A molecule is:
A
two or more substances that are mixed together.
B
two or more atoms that are chemically bonded.
C
a particle found in the nucleus of an atom.
16) A water molecule contains ________.
A
two hydrogen atoms and one oxygen atom
B
two hydrogen and two oxygen atoms
C
one hydrogen atom and two oxygen atoms
17) Polymers are chains of molecules that ________________.
A
can stretch forever
B
are found in only one shape
C
cannot be changed
18) A diatomic molecule is made from __________.
A
more than one kind of atom
B
two atoms from the same element
C
any atom
19) When dissolved into water, a molecule of potassium chloride ___________.
A
combines with the water molecules
B
separates into two molecules
C
separates into ions of potassium and ions of chlorine
20) What happens to electrons in an ionic bond?
A
One atom gains electrons and the other atom loses electrons.
B
Both atoms in the bond lose electrons.
C
They are shared equally between the atoms.
*select an answer for all questions
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