Which best describes a hydrate? It has water molecules bonded directly to it.

It lacks water molecules in its crystal lattice.

It lacks hydrogen and oxygen atoms, which make up water.

It has water molecules incorporated into its crystal lattice.

answer: i dont know the answer but this might

explanation:

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може ли да зареждате повече информация, моля

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.