Areaction has an equilibrium constant of 7.9×103 at 298 k. at 713 k , the equilibrium constant is 0.77. do you predict that the enthalpy of the reaction is positive or negative? why? positive, because endothermic reactions shift toward products at higher temperatures negative, because exothermic reactions shift toward reactants at higher temperatures negative, because exothermic reactions shift toward products at higher temperatures positive, because endothermic reactions shift toward reactants at higher temperatures

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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Is a logical series of steps