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  • Stage 1

    Answer 4 questions correctly in a row.

Look at the models and decide whether each model represents a molecule of an elementary substance or a compound. Then, place each substance in the correct column.
A model of a molecule containing one ball labeled C, one ball labeled H, and three balls labeled Cl.
chloroform
A model of a molecule containing two balls labeled N and four balls labeled H.
hydrazine
A model of a molecule containing two balls labeled I.
iodine
A model of a molecule containing two balls labeled C, six balls labeled H, and one ball labeled O.
ethanol
elementary substance
compound
H
C
N
O
Cl
I
ref_doc_title.

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