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Science Bowl Question

📅 NSB Middle School 2009🎓 MS🔄 Round 10#️⃣ Question 13❓ TOSS-UP📝 Multiple Choice

Which of the following is NOT true for a substance:

W) pure substances always contain the same ratio of elements
X) water and steam are 2 different forms of the same substance
Y) all compounds are substances and all substances are compounds
Z) a pure substance cannot be separated by physical means
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