Heat that flows by conduction is the transfer of thermal energy between substances in contact. for this to happen, what must occur?
a. the two systems must be the same temperature.
b. the two systems must not be touching each another.
c. one system must have higher kinetic energy than the other system.
d. the thermal energy of one system must be the same as the thermal energy of the other system.

What type of reaction is zn + cucl2 → cu + zncl2?

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.