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

A student claims that a pure substance must be an element. Which evidence best refutes this claim?

Water boils at a constant temperature and has a fixed composition, but it is a compound of hydrogen and oxygen Gold is an element that has a fixed melting point Salt dissolves in water to form a mixture Air contains several gases mixed together

Correct Answer:

Water boils at a constant temperature and has a fixed composition, but it is a compound of hydrogen and oxygen

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