The table shows the amount of radioactive element remaining in a sample over a period of time. Radioactive Decay Rate Amount of Radioactive Sample Time (grams) (years ) Part 1 What is the half -life of the element ? Explain how you determined this Part 2 How long would it take 312g of the sample to decay to 9.75 grams ? Show your work or explain your answer .

c is the answer because when something is left after something evaporates that shows the chemical change.

the answer is the first option

explanation:

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

1 is the answer to this problem