New Mexico NM-ASR Science Grade 8 Practice Questions - New Mexico Assessment Of Science Readiness - Science, Grade 8 Exam

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Which observation provides the best evidence that a solid sample of a substance is a pure element rather than a compound?

All atoms in the sample are the same type and it cannot be broken down by chemical means The sample conducts electricity when dissolved in water The sample has a high melting point The sample is made of more than one kind of atom chemically combined

Correct Answer:

All atoms in the sample are the same type and it cannot be broken down by chemical means

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