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an instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
true
false

True

Explanation:

There are two types of Van der waals forces which are intermolecular bonds. These bonds are London dispersion forces and Dipole-dipole attractions.

The london dispersion forces are weak attractions found between non-polar molecues and noble gas.

The attractions here is as a result of the fact that non-polar molecules or atoms sometimes becomes polar because the constant motion of its electrons may lead to an uneven charge distribution at an instant. This leads to the formation of a temporary dipole or instantaneous dipole. The dipole can induce the neighbouring molecules to be distorted and they form dipoles as well.

True

Explanation:

When the electrons migrate to one end of a molecule or atom, the other end has a tiny positive pole, whereas when the electrons travel, the other end has a tiny negative pole. For that moment, a dipole is formed.

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answer: a chemical reaction

explanation:

im not wrong

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"