Hydrogen is used as a fuel for space ships. In this combustion reaction hydrogen and oxygen combine to form water. The Gibbs energy for this reaction is negative at 773 K. a) Define a combustion reaction. (2 points) b) List the Gibbs energy equation and explain what it means. (3 points) c) Determine whether this reaction is spontaneous and explain why. (3 points)

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.