The property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard is : Hardness and Brittleness
Those properties make chalk leaves residues on the board every time friction happen between the chalk and the board
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see the answer below
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<em>The cells of the brain and spinal cord are irreplaceable because these cells do not undergo cell divisions like some other cells of the body.</em>
<u>Through cell division of the vegetative cells, damaged cells of the body are replaced by new cells. The cells of the brain and spinal cords however are special cells that will not divide under ordinary conditions. Hence, when there is any form of damage, there are no new cells to replace the damaged cells.</u>
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the partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules.
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And it makes sense that some people, seemingly surviving by dumb luck, would feel they acted selfishly in not trying to help those less fortunate. It definitely is selfish to act that way; to put one's own survival ahead of others
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i dont know i guess a3 b7 c4 d1 e8 f5 g9 h6 i2
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