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15
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What is the difference between a mixture and a chemical change?
In a chemical change, new substances are formed
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15
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What do elements in the same column of a periodic table have in common
They have the same number of valence electrons
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15
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Which compounds tend to form large crystal lattices? ionic or covalent?
ionic
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15
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T/F covalent compounds are between nonmetal and nonmetal
True
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seesaw
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gold
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shark
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thief
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15
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What is a giant covalent structure
Three dimensional structure of atoms made by covalent bonds
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thief
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seesaw
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fairy
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banana
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25
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which two non metals form large covalent lattice structures?
carbon (diamond) silicon (sand)
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15
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Explain the ionic bond
Bond formed between ions of opposite charges (usually metal and non-metal)
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15
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What is the difference between cation and anion?
Loss of electrons = cation, gaining of electrons = anion
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15
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How many electrons fit into the first, second, and third electron shells?
2,8,18
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seesaw
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rocket
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gift
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baam
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15
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What is the difference between atomic number and mass number?
Atomic number = how many protons an element has, mass number = neutrons + protons
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15
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T/F covalent compounds form small molecules and have low melting points
T
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15
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What is a covalent bond?
Two non metals share their electrons
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20
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Why do atoms form bonds?
To gain a stable arrangement of electrons
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