I think you forgot to give the choices along with your question. I am answering the question based on my research and knowledge. "Helium effuses 0.71 times faster than hydrogen" is the statement that <span>holds true when the molar mass of hydrogen is 2.0 grams and that of helium is 4.0 grams. I hope the answer has helped you.</span>
Answer:
The heating and melting of wax
Explanation:
When a candle is burned the wax heats up, but when cooled it hardens and cannot be put back into it original form.
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Answer: The number of Ni2+ ions is 1.46 × 10^18 ions
The number of Ag+ ions is 2.92 × 10^18 ions
Explanation: Please see the attachments below
Scientists look at their data and decide if the data supports the hypothesis.If the data is exactly the same after many experiments, the hypothesis is supported.If the data does not support the hypothesis, scientist may change the hypothesis or change the experiment .