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  • Stage 1

    Answer 6 out of 7 questions correctly.

Look at the chemical formula and the model below.
A model of a molecule containing two balls labeled H and one ball labeled O.
chemical formula for water
model of a water molecule
Both the chemical formula and the model tell you about the composition of water. But only the model gives you information about the arrangement of the atoms in a water molecule.
Match the meanings to the terms.
the order and shape in which the atoms are bonded together in a substance
the chemical elements that make up a substance
composition
arrangement
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