What happens to the reaction c2h6 + 137 kj c2h4+h2 when the temperature of the reaction is increased?

Answer is: at higher temperatures reaction will go to the right (forward), more products (C₂H₄ and H₂) will be produce, because this is endothermic reaction (ΔH is positive, energy is consumed) and according Le Chatelier's principle heat is included as a reactant.  .

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.