U4L1 Test Review

Match the following vocabulary words to their definitions.

• The BIG numbers in front; shows # copies

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• The substances on the RIGHT of the arrow

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• The SMALL numbers after the element

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• The substances on the LEFT of the arrow

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Match the following vocabulary words to their definitions.

• The unit used for molar mass

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• Compares the moles of two substances

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• The molecules are different

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• The weight of an element

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• The molecules stay the same

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How many "Fe" atoms are in Fe₂O₃?

How many "Na" atoms are in NaCl?

How many "O" atoms are in LiCO₃?

How many "H" atoms are in 2CH₄?

How many "O" atoms are in Ca(OH)₂?

How many "C" atoms are in 3CaCO₃?

How many "Cl" atoms are in Ba(ClO₃)₂?

Is the molecule 3FeCl₂ the same as the molecule Fe₃Cl₆? Why or why not? Use the models to support your answer.