What does it take to prove a hypothesis false?
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a. it is impossible to prove a hypothesis false
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b. at least ten examples
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c. one counterexample
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d. a poorly stated question

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Which element would mostly likely have an electron affinity measuring closest to zero

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures