Which of the following should have the highest surface tension at a given temperature?
a. ch4
b. cf4
c. ccl4
d. cbr4
e. ci4

E. CI4

Explanation:

The substance with the highest surface tension will be the one with the strongest intemolecular forces

All of the molecules have the formula CX4, where the X represents the halogen. All of them have a tetrahedral geometry. The geometry is important because it allows us to deduce that even thought all bonds are polar, the molecules of these substances themselves are non-polar since they are symmetrical. So the dominant forces in these substances are London dispersion forces which increase in strength as the size of the molecule increases. The biggest molecule is CI4

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.