Chemistry

What is the name for naturally-occurring alloy of gold and silver with a small amount of other metals?

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Which type of matter has definite volume but no definite shape?
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Which has no part in the scientific method of experimentation?
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What mineral has the chemical formula PbS?
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What symbol appears on the periodic table for the element with the atomic number 66?
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Which of these is the primary component of natural gas?
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What symbol appears on the periodic table for the element with the atomic number 22?
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Which of these is a chemical form of communication?
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What heat is released during a change of state?
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