When a calorimeter is used, no thermal energy is exchanged between the contents of the container and the outside air. if an exothermic reaction is conducted inside a calorimeter filled with water, which of the following statements best describes what occurs during the reaction?
the thermometer will show an increase in the water's temperature.
the total energy of the reaction will increase.
the reaction will absorb thermal energy from the surroundings.
the potential energy of the reactants will be lower than that of the reactants.

A

Explanation:

The last one (D) describes an endothermic reaction. D is not right.

The total energy will not increase. If it did everyone would use that reaction in their automobiles. That's getting something for nothing. B is not right.

C is wrong as well. If anything, the reaction will try to get rid of Thermal Energy. That means

A is correct. A is the exact opposite to C.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

c8h10 is your answerr