julio wrote some facts about covalent compounds in his lab notebook. the picture shows his lab notebook.

covalent compounds:
-bonds between nonmetals
-have low melting and boiling points
-dissociate into ions in an aqueous solution
-have weaker bonds than ionic compounds

julio made a mistake in his list. which statement best describes the mistake he made?

a
covalent compounds do not have bonds between nonmetals; they are between a nonmetal and a metal.

b
covalent compounds do not have low melting and boiling points; they have high melting and boiling points.

c
covalent compounds do not dissociate into ions in an aqueous solution; they are not conductive in an aqueous solution.

d
covalent compounds do not have weaker bonds than ionic compounds; they have stronger bonds than ionic compounds.

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter

During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

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