Aschool board is concerned that student test scores are being affected by
the fact that students do not get enough sleep at night. which of the
following is a testable hypothesis to use for finding whether or not this is
true?
a. children need at least two more hours of deep sleep at night than
adults need
b. children who eat breakfast and lunch achieve higher test scores
than children who skip either meal.
c. children who get more sleep at night eat healthier meals and
struggle less with obesity.
d. children who get a minimum of nine hours of sleep per night
achieve higher test scores than children who get fewer than nine
hours of sleep.

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic