Molecules Question Preview (ID: 44417)
Molecules Review.
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When an atom loses electrons in a chemical bond, the atom is called ________.
a) an element
b) an electrolyte
c) an ion
d)
The atomic number is the number of _____________ in the nucleus of an atom.
a) electrons
b) neutrons
c) protons
d)
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.
d)
Which part of the atom is so small it contributes very little to the mass of an atom?
a) proton
b) neutron
c) electron
d)
Where are the electrons in an atom found?
a) in the nucleus
b) both inside and outside of the nucleus
c) orbiting the nucleus
d)
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
d)
Atoms are made of protons, neutrons, and ______.
a) electrons
b) elements
c) molecules
d)
Which particles are in the nucleus of an atom?
a) protons and neutrons
b) protons and electrons
c) protons, neutrons, and electrons
d)
______ is matter made of one kind of atom.
a) An element
b) A molecule
c) A proton
d)
The vertical columns in the periodic table are known as:
a) periods.
b) groups.
c) valences.
d)
Why is the periodic table so useful to scientists?
a) It can be used to predict how elements react.
b) It contains the recipes for a variety of different kinds of mixtures.
c) It reminds them what the elements look like.
d)
The halogens are:
a) very reactive metals.
b) very reactive nonmetals.
c) inert gases.
d)
Which element listed below is a nonmetal?
a) sodium (Na)
b) chlorine (Cl)
c) magnesium (Mg)
d)
Which statement best summarizes the development of the periodic table of elements over time?
a) Scientists reorganized and named the groups on Mendeleev’s table.
b) Scientists discovered other elements and added them into Mendeleev’s table.
c) Scientists found errors in Mendeleev’s table and removed certain elements.
d)
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.
d)
A water molecule contains ________.
a) one hydrogen atom and two oxygen atoms
b) two hydrogen atoms and one oxygen atom
c) two hydrogen and two oxygen atoms
d)
Polymers are chains of molecules that ________________.
a) cannot be changed
b) are found in only one shape
c) can stretch forever
d)
A diatomic molecule is made from __________.
a) any atom
b) more than one kind of atom
c) two atoms from the same element
d)
When dissolved into water, a molecule of potassium chloride ___________.
a) combines with the water molecules
b) separates into ions of potassium and ions of chlorine
c) separates into two molecules
d)
What happens to electrons in an ionic bond?
a) They are shared equally between the atoms.
b) Both atoms in the bond lose electrons.
c) One atom gains electrons and the other atom loses electrons.
d)
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