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EJERCICIO: Conociendo que a P = 1 atm, la temperatura de fusión del agua es 0 °C con una entalpía molar de fusión igual a 6.01 kJ mol¹. Calcular la temperatura de fusión de agua a 542 mm Hg. $\rho_{hielo}$ = 0.9167 g mL, $\rho_{agua}$ = 0.9998 g mL.

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Which of the following pertains to both tetanus and foodborne botulism? Multiple Choice An exotoxin blocks acetylcholine release. They are caused by enterotoxins of the pathogen. Nausea and diarrhea are symptoms. They occur when endospore-contaminated soil enters deep wounds. Treatment involves antitoxin therapy.

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4. Down syndrome is most commonly caused by A. increased age of the father. B. failure of the 21st pair of chromosomes to separate during meiosis, causing three chromosomes rather than two. C. mutation of the genetic material on the 23rd chromosomal pair. D. trauma at birth.

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Cell free fetal DNA methods (where DNA from the fetus is obtained from the mother's blood) are revolutionizing prenatal screening. What type of error or errors (if any) occur(s) frequently when trying to identify trisomy events? False positives (test detects trisomy event when none exits) ?Neither false postives nor false negatives occur often ($<1\%$ of the time) False positives and false negatives are about equally common--approximately 10% of the time False negative (test fails to detect trisomy when it really exists)

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Choose the correct option/s. The IMD World Competitiveness Yearbook analyses and ra economies by groupings that comprise: 1. economic performance 2. government efficiency 3. business efficiency 4. infrastructure 5. technology O a. 1 Ob. 1,2 c. 1,2,3 Od. 1,2,3,4 e. 1,2,3,4,5

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Is a price of 3.75 an equilibrium price? If yes, why and if not why not?

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False

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Research suggests that most adults are situated at the _____level of moral development. Group of answer choices concrete Conventional postconventional preconventional

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5) Graph the levels of gonadotropin hormones on the upper graph below and the levels of ovarian hormones on the lower graph below as the ovarian cycle progresses. (8 points) Add to this figure a graph depicting the thickness of the endometrium. (3 points) Label the phases of the menstrual cycle on the graph and indicate where ovulation occurs. (4 points) 50 40 Plasma hormone level (arbitrary units) 30 20 10 (a) Fluctuation of gonadotropin levels Plasma hormone level (arbitrary units) 15 10 5 0 Days 1 5 10 15 20 25 28 (b) Fluctuation of ovarian hormone levels

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2) Figure 2 shows two concentric rings of radii R and R' = 3R that lie on the same plane. Point N lies on the central z-axis, at distance D = 2R from the center of the rings. The smaller ring has uniformly distributed charge +Q. In terms of Q, what is the uniformly distributed charge on the larger ring if the net electric field at N is zero?

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jorge r.