Chemistry

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

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What process causes molecules to move into areas that have fewer molecules?
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What is a substance made from only one type of atom called?
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Which element has the chemical symbol Ca?
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What is the name of the temperature at which Helium I becomes Helium II?
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What are proteins that help speed up chemical reactions called?
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The study of the effects of light on chemical reactions is known as what?
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What kind of gas is CO2?
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Which of these is used to determine the strength of a chemical bond?
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