A beaker contains a mixture of sand and salt. A student adds water to dissolve the salt. Which processes can be used to separate out the sand and salt?
A. distillation to collect both the sand and the salt
B. filtration to collect both the sand and the salt
C. distillation to collect the sand and filtration to collect the salt
D. filtration to collect the sand and distillation to collect the salt

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.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante