In what ways is the evolution of a massive star similar to the evolution of the sun, and in what ways is it different ?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?