Upload a file with your answers to this question. Your upload MUST be ONE FILE. 1) (1 point)
In a normal distribution, what proportion of scores fall between z= -1.25 and z= 2.75. (Sketch the
distribution to show your work).
2) (1 point)
Intelligence quotient (IQ) scores are normally distributed with a mean of 100 and a standard
deviation of 15. If everyone I meet claims that their IQ is above 145, should I feel skeptical about the
likelihood that most people have IQs at this level?
Explain your answer by drawing the sketch and describing the proportion of people with IQs
above 145.
3) (1 point)
In her math class, Kim received a 75 on her test (mean for the class was 80 and standard deviation
was 3). Her friend Pat took a test on the same day in her english class and earned a 60 (mean for the
class was 55 and standard deviation was 2). Kim is bragging that she did better relative to her
classmates than Pat because her score was higher. Is she correct?
Explain your answer by providing sketches and z-scores.

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution

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

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent