Which of these observations does NOT provide evidence for the heliocentric model of our solar system? A- Planets move in elliptical orbits.

B- Comets move in regular, elliptical orbits.

C- Venus shows phases, just like the Moon.

D- Earth's gravitational pull keeps its moon in orbit.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

When water dissociates, each water molecule splits into a hydroxide ion and a) h 3 o + b) a hydrogen atom c) a hydrogen ion d) h 2 o e) oh —

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?