Amixture in which the particles are to small to b seen with the naked eye is?

When the particles of a solution or a mixture are so small that they cannot be seen directly from our naked eyes the mixture was formed due called colloid. These are heterogeneous mixtures.

Explanation:

There are different methods to tell a mixture from compound and in this case it is done by passing light through it. When a beam of light is passed through this mixture the particles although being small all are enough such that scattering of the beam takes place and its path can be seen.  

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.