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Atoms and Bonding
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When an atom loses an electron, it becomes ___.
an ion
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What is the chemical name for the compound Na2S?
Sodium sulfide
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How do we draw a bond between two atoms?
two dots (electrons) or a dash line
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A covalent bond in which electrons are shared unequally is ___.
a polar bond
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Which of these is a property of ionic compounds?
brittle
low melting point
cannot conduct electricity
low boiling point
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The electrons involved in bonding are ___ electrons.
valence
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Give a reason for why water and oil don't mix.
Water is polar and oil is nonpolar
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How does a covalent bond hold two atoms together?
The nucleus of the atom is positive and the electrons of the other atom is negative, they attract to each other
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A metal consists of positive metal ions in a "sea" of ___.
electrons
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In the chemical formula for hydrogen peroxide (H2O2) what do the 2's mean?
There are 2 hydrogen atoms and 2 oxygen atoms in it
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When electrons are transferred between two atoms, a ___ bond is formed.
Ionic
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What is one advantage of using an alloy instead of a pure metal?
stronger, resists corrosion, not as bendable
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Stainless steel and bronze are examples of ___.
an alloy
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When an atom gains an electron, it becomes ___.
Negative
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Give one property of an ionic compound.
crystal structure, conducts heat and electricity, high boiling point
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The attraction between a positive metal ion and the electrons surrounding it is ___.
a metallic bond
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How many electrons make an atom "happy"?
8
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