Chemical Interactions in Antarctic Marine Benthic Ecosystems
Chemical Interactions Chapter 2 Review
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Transcript of Chemical Interactions Chapter 2 Review
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Chemical Interactions
Chapter 2 ReviewGood Luck!
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How do the properties of a compound compare with the
properties of the elements that make it?
They are often quite different
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What two factors determine the properties of a compound?
the types of atoms it contains and how the atoms are arranged
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How do we represent compounds?
by a chemical formula
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NaNO3 has how many oxygen atoms?
Three
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What is a subscript?
a subscript is a number written to the right of a chemical symbol and slightly below it.
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Write the formula for one atom of nitrogen and one atom of oxygen.
NO
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How can millions of compounds be made from the atoms of about 100 elements
atoms can combine in many different ratios
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What do you get when an atom loses or gains an electron?
an ion
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What do you call the force of attraction between positive
and negative ions?an ionic bond
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What type of bond holds a crystal together?
Ionic bond
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What is the name of MgO
magnesium oxide
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What type of bond is formed when electrons are shared?
covalent
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What type of bond forms from unequal sharing of electrons?
Polar covalent
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What is responsible for many of the properties of substances?
their structure
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What type of bond is found in individual molecules?covalent
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What part of an atom is involved in chemical bonding?
electron cloud
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What property of the electrons in a metal gives the metal its
properties?
They move easily
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Are covalent compounds good conductors of electricity when dissolved? Why or Why not?No, molecules stay together and do not conduct an electrical current.
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How do metal atoms bond together?
Metal atoms share electrons with many other metal atoms at the same time.
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Why do ionic compounds have high melting points?
Each ion in a crystal is rigidly bonded to the several ions that surround it. Because each ion is strongly bonded to other ions, much energy has to be added to break the bonds.
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What are three forms of the element carbon?
Graphite, diamond, and fullerene
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Most substances arecompounds
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All compounds are made of
atoms of two or more elements
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The chemical formula for a compound have one barium (Ba) ion and two chloride (Cl) ions is
BaCl2
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The 4 in the chemical formula CH4 means there are
four hydrogen atoms to one carbon atom
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An atom becomes a positive ion when it
loses an electron to another atom
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A polar covalent bond forms when two atoms
share two electrons unequally
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Metallic bonds make many metals
good conductors of electricity