Use bond enthalpies to estimate ∆Hrxn for the Haber process below in which nitrogen from the air is ‘fixed’ into a usable form. Compare this with ∆Hrxn calculated from ∆Hºf, which is –46.19 kJ per mol of NH3(g). If there is a difference, why is there a difference? Which do you expect to be more accurate and why? N2(g) + 3H2(g) → 2NH3(g)

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

What does a numerical subscript following an element in a chemical formula mean?

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.