7. explain why a + is used when electrons were lost and a - is used when electrons a
d a - is used when electrons are gained

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Explanation:

Electrons have a negative charge so when you add a negative to a negative, it creates a positive. Same thing is true when you add a negative to a positive, you get a negative. So Cl- plus 2- electrons would be Cl2+. If it was Cl+ plus 2- electrons, it would be Cl2-. Electrons will never be positive.

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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.