What is the definition of an alkyne

When will le chatelier's principle come into effect? at the beginning of a reaction, when there are only reactants when a reaction has reached chemical equilibrium when a catalyst is added to a reaction mixture when a reaction is occurring but not yet at equilibrium

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

What shape would a molecule with two bound groups and two lone pairs have?