New Jersey NJSLA Science Grade 8 Practice Questions - New Jersey Student Learning Assessments - Science Grade 8 Exam

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A student draws a model of water (H2O) as two hydrogen atoms bonded to one oxygen atom. Which feature must the model show to correctly represent that water is a compound and not a mixture?

The hydrogen and oxygen atoms are chemically bonded in a fixed ratio. The hydrogen and oxygen atoms are physically mixed but can be separated by filtering. The atoms are clustered together but each keeps its original properties. The oxygen atom is larger than the two hydrogen atoms so they stick to it.

Correct Answer:

The hydrogen and oxygen atoms are chemically bonded in a fixed ratio.

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