(repost) PLEASE HELP NEED ANSWERS ASAP: Most high-school science courses are arranged such that a student will first take biology, then chemistry, and then physics, or else first take physics, then chemistry, and then biology. Explain a possible reason for this phenomenon.

Which compound contain an iron with a 3+ charge

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The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)